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| 1 | Effect of particle size on the microstructure and thermal conductivity of Al/diamond composites prepared by spark plasma sintering显示文摘Spark plasma sintering (SPS) was used to fabricate Al/diamond composites. The influence of diamond particle size on the microstructure and thermal conductivity (TC) of composites was investigated by combining experimental results with model prediction. The results show that both composites with 40 μm particles and 70 μm particles exhibit high density and good TC, and the composite with 70 μm particles indicates an excellent TC of 325 W·m-1·K-1. Their TCs lay between the theoretical estimated bounds. In contrast, the composite with 100 μm particles demonstrates low density as well as poor TC due to its high porosity and weak interfacial bonding. Its TC is even considerably less than the lower bound of the predicted value. Using larger diamond particles can further enhance thermal conductive performance only based on the premise that highly dense composites of strong interfacial bonding can be obtained. | CHU Ke JIA Chengchang LIANG Xuebing CHEN Hui GAO Wenji | 2009 | Rare Metals2009，28，6： | 22 |
| 2 | Effect of powder mixing process on the microstructure and thermal conductivity of Al/diamond composites fabricated by spark plasma sintering显示文摘Two powder mixing processes, mechanical mixing (MM) and mechanical alloying (MA), were used to prepare mixed Al/diamond powders, which were subsequently consolidated using spark plasma sintering (SPS) to produce bulk Al/diamond composites. The effects of the powder mixing process on the morphologies of the mixed powders, the microstructure and the thermal conductivity of the composites were investigated. The results show that the powder mixing process can significantly affect the microstructure and the thermal conductivity of the composites. Agglomerations of the particles occurred in mixed powders using MM for 30 min, which led to high pore content and weak interfacial bonding in the composites and resulted in low relative density and low thermal conductivity for the composites. Mixed powders of homogeneous distribution of diamond particles could be obtained using MA for 10 min and MM for 2 h. The composite prepared through MA indicated a high relative density but low thermal conductivity due to its defects, such as damaged particles, Fe impurity, and local interfacial debonding, which were mainly introduced in the MA process. In contrast, the composite made by MM for 2 h demonstrated high relative density and an excellent thermal conductivity of 325 W·m-1·K-1, owing to its having few defects and strong interfacial bonding. | CHU Ke, JIA Chengchang, LIANG Xuebing, and CHEN Hui School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China | 2010 | Rare Metals2010，29，1： | 17 |
| 3 | Fabrication,microstructures,and properties of copper matrix composites reinforced by molybdenum-coated carbon nanotubes显示文摘Multiwalled carbon nanotubes(CNTs) were coated by a molybdenum layer using carbonyl thermal decomposition process with a precursor of molybdenum hexacarbonyl.The Mo-coated CNTs(Mo-CNTs) were added into copper powders to fabricate Mo-CNT/Cu composites by means of mechanical milling followed by spark plasma sintering.The Mo-CNTs were uniform dispersion in the Cu matrix when their contents were 2.5 vol.%-7.5 vol.%,while some Mo-CNT clusters were clearly observed at additions of 10.0 vol.%-15.0 vol.% Mo-CNTs in the mixture.The mechanical,electrical,and thermal properties of the Mo-CNT/Cu composites were characterized,and the results showed that the tensile strength and hardness were 2.0 and 2.2 times higher than those of CNT-free specimens,respectively.Moreover,the Mo-CNT/Cu composites exhibited an enhanced thermal conductivity but inferior electrical conductivity compared with sintered pure Cu.The uncoated CNT/Cu composites were fabricated by the similar processes,and the measured tensile strength,hardness,thermal conductivity,and electrical conductivity of the CNT/Cu composites were lower than those of the Mo-CNT/Cu composites. | NIE Junhui JIA Chengchang JIA Xian ZHANG Yafeng SHI Na LI Yi | 2011 | Rare Metals2011，30，4： | 12 |
| 4 | Net-shape forming of composite packages with high thermal conductivity显示文摘The continuing miniaturization of electronic devices in microelectronics and semiconductors drives the development of new packaging materials with enhanced thermal conductivity to dissipate the heat generated in electronic packages. In recent years, several promising composite materials with high thermal conductivity have been developed successfully for high performance electronic equipment to replace the traditional Kovar and Cu/W or Cu/Mo alloys, such as SiCp/Al, SICp/Cu, diamond/Al and diamond/Cu. However, these materials with high content of reinforcements have not been widely used in packaging field because they are hard to be machined into complex-shaped parts due to their greater hardness and brittleness. So, it is necessary to explore a near-net shape forming technology for these composites. In this paper, a novel technology of powder injection molding-infiltration is introduced to realize the near-net shaped preparation of the composite packages with high thermal conductivity. | HE XinBo QU XuanHui REN ShuBin JIA ChengChang | 2009 | Science China(Technological Sciences)2009，52，1： | 8 |
| 5 | Pressure sintering of W-15wt.%Cu alloys prepared by mechanical alloying as a subsequent densification treatment method显示文摘The sintered W-15wt.%Cu alloys fabricated by mechanical alloying were re-sintered under pressure to increase the density and improve the properties of these alloys. The pressure was applied vertically along the axis of the sintered sample. Properties such as density, hardness, and bending strength were measured. The microstructures of the sintered bod- ies were observed. The results showed that the subsequent pressure sintering could increase the density of the sintered W-15wt.%Cu alloys. Their hardness, bending strength, and some other physical properties were also improved by this sub- sequent densification treatment. | LI Zhigang JIA Chengchang SUN Lan HE Yuntao FAN Shimin | 2006 | Rare Metals2006，25，2： | 8 |
| 6 | Predicted interfacial thermal conductance and thermal conductivity of diamond/Al composites with various interfacial coatings显示文摘The interfacial thermal conductance (ITC) and thermal conductivity (TC) of diamond/Al composites with various coatings were theoretically studied and discussed. A series of predictions and numerical analyses were performed to investigate the effect of thickness, sound velocity, and other parameters of coating layers on the ITC and TC. It is found that both the ITC and TC decline with increasing coating thickness, especially for the coatings with relatively low thermal conductivity. Nevertheless, if the coating thickness is close to zero, or quite a small value, the ITC and TC are mainly determined by the constants of the coating material. Under this condition, coatings such as Ni, TiC, Mo 2 C, SiC, and Si can significantly improve the ITC and TC of diamond/Al composites. By contrast, coatings like Ag will exert the negative effect. Taking the optimization of interfacial bonding into account, conductive carbides such as TiC or Mo 2 C with low thickness can be the most suitable coatings for diamond/Al composites. | LIANG Xuebing JIA Chengchang CHU Ke CHEN Hui | 2011 | Rare Metals2011，30，5： | 8 |
| 7 | Copper base materials prepared by gel-casting process显示文摘Gel-casting process was developed as a new molding process in the field of copper base powder metallurgy to manufacture metal parts with excellent performance and complex shapes.Through changing the parameters of gel-casting process,such as dispersant and solid loading,the corresponding effects on the rheology of Cu slurries,molding and sintering behaviors were studied.The results show that the viscosity of Cu slurries was significantly reduced with an increase in dispersant.The most appropriate solid loading was found to be 61% and the sintering temperature was 910°C in these experiments.After the optimization of parameters of gel-casting process,copper composite parts with relatively high density and better properties were obtained. | LIU Weihua JIA Chengchang SHI Yantao HAN Yuepeng | 2008 | Rare Metals2008，27，1： | 7 |
| 8 | Kinetic characteristics of liquid phase sintering of mechanically activated W-15wt%Cu powder显示文摘The kinetic characteristics of W grain growth operated by diffusion controlled Oswald ripening (DOR) during liquid phase sintering were studied. A liquid phase sintering of W-15wt%Cu was carried out by pushing compacts into a furnace at the moment when the temperature increased to 1340°C for different sintering times. The results show that liquid phase sintering produces the compacts with considerably low relative density and inversely, rather high homogeneity. On the basis of the data extracted from the SEM images, the kinetic equation of W grain growth, G n = G 0n+ kt, is determined in which the grain growth exponent n is 3 and the grain growth rate constant k is 0.15 μm3/s. The cumulative normalized grain size distributions produced by different sintering times show self-similar. The cumulative distribution function is extracted from the curves by non-linear fitting. In addition, the sintering kinetic characteristics of W-15wt%Cu compacts were also investigated. | Zhigang Li Chengchang Jia Yuntao He Liliang Chen | 2006 | Journal of University of Science and Technology Beijing2006，13，4： | 7 |
| 9 | Microstructures of Sintered Mo-Cu Alloys with Mechanically Activated Powder显示文摘Mechanical activation and liquid phase sintering were used to manufacture high performance Mo-Cu alloy and develop new processes. The microsboctures and propefties of the alloy were investigated. The experimental results showed that: (1) the ball milled Mo/Cu powder has lamellar structure, (2) the microstructures of the sintered Mo-Cu alloy were homogenous composed structUres of adhesive phase Cu linking Mo grains, (3) Mo grains frequently strung or ga- thered in Cu phase, and (4) the full densities of Mo-Cu alloy was achieved through sintering and special densification process. As a result, the properties of the alloy are good enough to satisfy various requirements. | Chengchang Jia, Zhong He, Xuekuan Su, Ziqin Yang, Jun Zhao, Zizhang Xie (School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China Beliing Polytechnic University, Beijing 100022, Beijing) | 2001 | Rare Metals2001，20，2： | 7 |
| 10 | Influence of lanthanum on enhancement of mechanical and electrical properties of Cu-Al_2O_3 composites显示文摘Two kinds of Cu-Al_2O_3 composites(with and without La) were prepared via mechanical alloying-spark plasma sintering(MA-SPS) method. Microstructure, mechanical properties and electrical resistivity were investigated systematically using metallography, scanning electron microscopy, transmission electron microscopy, mechanical and electrical properties testing. The results indicate that an appropriate amount of La can homogenize the distribution of Al_2O_3. As such, yield strength, ultimate tensile strength and elongation of Cu-Al_2O_3-La are greatly increased. Some semi-coherent interface between Cu and Al_2O_3 is found, which means a low interface energy. The grain shape of Cu changes to irregular band with the addition of La. This change results in a density decrease of grain boundary and reduces electrical resistance. Lanthanum may exist in the form of La_2O_3. | Yifan Zhang Zhen Ji Chengchang Jia Guimin Liu Farong Wan Qian Zhan | 2019 | Journal of Rare Earths2019，37，5： | 7 |
| 11 | Influence of mechanical alloying time on the properties of Fe_3Al intermetallics prepared by spark plasma sintering显示文摘The Fe3Al-based intermetallics were prepared by mechanical alloying and spark plasma sintering (SPS), and the influence of milling time on the properties of materials was investigated. The phase identification was investigated by X-ray, and the surface morphology and fractography were observed by scanning electron microscope (SEM). The mechanical properties such as bending strength, strain, and microhardness were tested. The results show that Fe reacts with Al completely to form Fe3Al during short SPS processing time. The relative densities of the sintered samples were nearly 100/. The mechanical properties of the sintered samples can be improved along with the milling time. The representative values are the bend strength of 1327 MPa and the microhardness of 434. | Chengchang Jia Qing He Jie Meng Lina Guo | 2007 | Journal of University of Science and Technology Beijing2007，14，4： | 6 |
| 12 | Effect of processing parameters on the microstructure and thermal conductivity of diamond/Ag composites fabricated by spark plasma sintering显示文摘Diamond/metal composites with 50 vol.% diamond have been produced by spark plasma sintering(SPS) using pure Ag as a matrix and diamond particles as reinforcement.Three kinds of powder mixing processes were used to prepare the mixture of diamond/Ag powders:dry mixing without milling medium,wet mixing and magnetic blending.Subsequently,they were all consolidated by SPS at various processing parameters to produce bulk diamond/Ag composites.Then samples were heat treated in order to obtain a higher thermal conductivity.The effect of processing parameters on the morphologies of the mixed powders,the microstructure and the thermal conductivity of the composites were investigated by comparing the experimental data.It reveals that particles were easy to agglomerate and the distribution of mixed powders was inhomogeneous by dry mixing method,and wet mixing method is too complex.The most favorable mixing process is magnetic blending by which the powders can be homogenously mixed and the composites prepared by optimized SPS processing parameters can obtain the highest relative density and the best thermal conductivity among the composites prepared by different processes.The magnetic blending diamond/Ag composites even have a 23% increase in thermal conductivity compared with pure silver sintered by SPS. | GAO Wenjia,JIA Chengchang,JIA Xian,LIANG Xuebing,CHU Ke,ZHANG Luman,HUANG Hai,and LIU Meng School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China | 2010 | Rare Metals2010，29，6： | 6 |
| 13 | Effects of silver powder particle size on the microstructure and properties of Ag-Yb_2O_3 electrical contact materials prepared by spark plasma sintering显示文摘Ag-Yb2O3 electrical contact materials were fabricated by spark plasma sintering(SPS).The effects of silver powder particle size on the microstructure and properties of the samples were investigated.The surface morphologies of the sintered samples were examined by optical microscope(OM),and the fracture morphologies were observed by scanning electron microscopy(SEM).The physical and mechanical properties such as density,electrical resistivity,microhardness,and tensile strength were also tested.The results show that the silver powder particle size has evident effects on the sintered materials.Comparing with coarse silver powder(5 μm),homogeneous and fine microstructure was obtained by fine silver powder(≤0.5 μm).At the same time,the electrical conductivity,microhardness,and tensile strength of the sintered samples with fine silver powder were higher than those of the samples with coarse silver powder.However,silver powder particle size has little influence on the relative densities,which of all samples(both by fine and coarse silver powders) is more than 95%.The fracture characteristics are ductile. | CHEN Xiaohua,JIA Chengchang,and LIU Xiangbing School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China | 2010 | Rare Metals2010，29，4： | 6 |
| 14 | Microstructure and Properties of W-Cu Alloys Prepared with Mechanically Activated Powder显示文摘W-15% Cu (mass fraction) alloys were sintered with mechanically activated powder in order to develop new preparing processes and improve properties of alloys. The microstructures of the activated powder and the sintered alloy were observed. Properties such as density were measured. The results show that through mechanical activation, the particle size of the powder becomes finer to sub-micron or nanometer level, some copper was soluble in tungsten, and high density W-Cu alloys can be obtained by mechanically activated powder for its action to the activation sintering. | Chengchang Jia, Xiuhu Guan, Xuekuan Su, Changheng Hou, Shimin Fan, Jun Zhao, Zizhang Xie (Material Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China) (Beijing Research Institute of Powder Metallurgy, Beiji | 2001 | Journal of University of Science and Technology Beijing2001，8，2： | 5 |
| 15 | Thermal conductivity behavior of SPS consolidated AlN/Al composites for thermal management applications显示文摘AlN/Al composites are a potentially new kind of thermal management material for electronic packaging and heat sink applications.The spark plasma sintering (SPS) technique was used for the first time to prepare the AlN/Al composites,and attention was focused on the effects of sintering parameters on the relative density,microstructure and,in particular,thermal conductivity behavior of the composites.The results showed that the relative density and thermal conductivity of the composites increased with increasing sintering temperature and pressure.The composites sintered at 1550 ℃ for 5 min under 70 MPa showed the maximum relative density and thermal conductivity,corresponding to 99% and 97.5 W m-1 K-1,respectively.However,the thermal conductivity of present AlN/Al composites is still far below the theoretical value.Possible reasons for this deviation were discussed. | DUN Bo JIA Xian JIA Chengchang CHU Ke | 2011 | Rare Metals2011，30，2： | 5 |
| 16 | Application of the gel casting process in iron powder metallurgy显示文摘The effects of various gel casting process parameters such as the dispersant and solid loading on the rheology of Fe slurries, molding, and sintering behaviors were studied. The relationship between solid loading and viscidity in the process of iron base powder metallurgy was researched to obtain better microstructure and properties. The results showed that the viscosity of Fe slurries is obviously reduced with the increase of the dispersant. The suitable parameters are as follows: the solid loading is 61% and sintering temperature is 1180℃. Iron parts with relatively high density and better properties were obtained by the gel casting process. | Chengchang Jia Weihua Liu Zhimeng Guo | 2006 | Journal of University of Science and Technology Beijing2006，13，1： | 5 |
| 17 | Pressure infiltrated Cu/diamond composites for LED applications显示文摘Diamond reinforced copper (Cu/diamond) composites were prepared by a pressure infiltration technique.The composites show a super high conductivity of 713 W m-1 K-1 in combination with an extremely low coefficient of thermal expansion (CTE) of 7.72 × 10-6 K-1 (25-100 ℃),which are achieved by modifying the copper matrix with adding 0.3 wt.% of boron to get a good thermal contact between the matrix and the diamond particles.By adopting a series of postmachining techniques the composites were made into near-net-shape parts,and an electroless silver coating was also successfully plated on the composites.Finally,their potential applications in the thermal management of light emitting diodes (LED) were illustrated via prototype examples. | FAN Yeming GUO Hong XU Jun CHU Ke ZHU Xuexin JIA Chengchang YIN Fazhang | 2011 | Rare Metals2011，30，2： | 4 |
| 18 | Change in relative density of WC-Co cemented carbides in spark plasma sintering process显示文摘The relative density of WC-Co cemented carbides during spark plasma sintering(SPS) was analyzed.Based on the change in displacement of the ram in the SPS system,the relative densities in the sintering process can be achieved at different temperatures.The results indicated that densification of the samples started at near 900°C,the density rapidly reached its maximum at the increasing temperature stage,in which the temperature was lower than the sintering temperature of 1200°C,and most of the densification took place in the stage.Besides,the theoretical values were consistent with the experimental results. | SUN Lan LIN Chenguang JIA Chengchang JIA Xian XIAN Mina | 2008 | Rare Metals2008，27，1： | 4 |
| 19 | β-Sialon Produced by Carbon Thermal Nitriding Reaction of Bauxite显示文摘β-Sialon was produced by carbon thermal nitriding reaction in N2 gas atmosphere when the mixtures of bauxite and anthracite were put into vertical furnace. According to the mass loss of raw materials and the result of X-ray diffration (XRD) of products, the influences of the process parameters on the compositions and relative contents of products, such as the fixed carbon content, the flow of N2, the soaking time and the temperature, were researched. | Jun Wang, Nan Li, Caicheng Shi, Chengchang Jia ( Material Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China Material Science and Engineering School, Wuhan University of Science and Technology, Wuhan 430 | 2000 | International Journal of Minerals,Metallurgy and Materials2000，14，3： | 3 |
| 20 | Effect of solution cooling rate on the γ′ precipitation behaviors of a Ni-base P/M superalloy显示文摘The effect of cooling rate on the cooling γ′ precipitation behaviors was investigated in a Ni-base powder/metallurgy (P/M) superalloy (FGH4096). The empirical equations were established between the cooling rate and the average sizes of secondary and tertiary γ′ precipitates within grains and tertiary γ′ precipitates at grain boundaries, as well as the apparent width of grain boundaries. The results show that the average sizes of secondary or tertiary γ′ precipitates are inversely correlated with the cooling rate. The shape of secondary γ′ precipitates within grains changes from butterfly-like to spherical with the increase of cooling rate, but all the tertiary γ′ precipitates formed are spherical in shape. It is also found that tertiary γ′ may be precipitated in the latter part of the cooling cycle only if the cooling rate is not faster than 4.3°C/s, and the apparent width of grain boundaries decreases linearly with the in-crease of cooling rate. | Gaofeng Tian Chengchang Jia Ying Wen Benfu Hu | 2008 | Journal of University of Science and Technology Beijing2008，15，6： | 3 |
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