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| 1 | Mechanical Behaviors of Ti-Si-N Coatings Deposited by Bias Sputtering显示文摘Ti-Si-N hard coatings were deposited on steel substrates by reactive unbalanced magnetron sputtering from Ti and Si elemental targets in a mixture of Ar and N2 gases.The influences of negative bias voltage(in the range of-30 to-80 V)on the mechanical properties of the coatings were investigated.In particular,the critical cycle during dynamic impact tests was employed to indicate the bonding strength of the coatings.It was found that the Ti-Si-N coatings prepared at lower constant bias voltages could effectively improve the adhesion and the cyclic impact performance,but their hardness was dropped significantly to 13 GPa at a bias of-30 V.Higher bias voltage values induced greater hardness.A maximum hardness of 47 GPa was obtained at a bias of-60 V.However,the coating adhesion was worse in this case,and the number of impact cycles(~8×10 3)that the coatings could endure was much shorter than that of TiN binary coatings(~2×104).On the other hand,the bias voltage was varied linearly from-40 to-60 V during Ti-Si-N deposition.Under this circumstance,the hardness of the coatings deposited with the bias-graded configuration remained very high(42 GPa),and the adhesion strength was improved substantially.Also,the critical impact cycle could reach as high as 1.8×104.Therefore,bias-graded deposition can provide an effective processing route to prepare Ti-Si-N superhard coatings with high adhesion strength and impact resistance. | P W Shum | 2012 | 稀有金属材料与工程2012，41，S1： | 2 |
| 2 | Feasibility Study of Using DLC Coating in Conjunction with Laser Ablation process to Improve the Tribological Performance of an Engineering Surface显示文摘Increasing demands such as low friction,low wear rate,and long life-time have reached the limits of single DLC coatings.In order to meet the requirements,we propose to use an integrated approach to improve the wear property of an engineering surface.Firstly,dimples are introduced perpendicular to an engineering surface by a Nd:YAG laser emitting at 1064 nm.Subsequently,solid lubricant DLC is prepared on the patterned surface by magnetron sputtering technique.The effect of dimple densities from 7%to 45 %on tribological properties of the coating surface was revealed.The wear performance of the textured DLC surfaces was studied by a pin-on-disk reciprocating sliding wear tester under boundary lubrication and dry conditions.The results showed that the DLC coatings with appropriate dimple densities have an obvious improvement on wear performance in term of friction coefficient,wear rate and wear life,as compared to un-textured DLC coatings.In boundary lubrication conditions,the improved wear performance can be explained by the promotion of reservoirs to enhance lubricant retention during sliding.In dry condition,the dimples trap wear particles and leave a free interface between pin and sliding contact surface,and avoid the surface worn by abrasive manner,thereby improving the wear performance of the DLC coating. | Shum P W | 2012 | 稀有金属材料与工程2012，41，S1： | 2 |
| 3 | Weakly c-normal subgroups of finite groups and their properties显示文摘 | Zhu L J Guo W B Shum K P | 2002 | Comm Alg2002，30，11： | 1 |
| 4 | Improvement of high-speed turning performance of TiA1N coatings by using a pretreatment of high-energy ion implantation 显示文摘 | Shum P W Li K Y Shen Y G | 2005 | Surface and Coating Technology2005，198，3： | 1 |
| 5 | Conditionally permutable subgroups and supersolubility of finite groups显示文摘 | GUO W SHUM K P SKIBA A | 2005 | Southeast Asian Bulletin of Mathematics2005，29，2： | 1 |
| 6 | Weakly c-normal subgroups of finite groups and their properties 显示文摘 | Guo W B Shum K P | 2002 | Comm in Algebra2002，30，11： | 1 |
| 7 | Nonlinear polarization rota- tion in semiconductor optical amplifiers with linear polar- ization maintenance显示文摘 | Fu S Zhong W Shum P | 2007 | IEEE Photonics Technology Let- ters2007，19，23： | 1 |
| 8 | Switching dynamics of optical pulses in a nonlinear directional coupler 显示文摘 | Shum P K Chiang S Gambling W A | 1999 | IEEE J Quantum Electron1999，35，1： | 1 |
| 9 | Structural,mechanical,and tribological studies of Cr-Ti-AI-N coating with different chemical compositions显示文摘 | Tam P L Zhou Z F Shum P W | | 0，，16： | 1 |
| 10 | Substrate bias effects on mechanical and tribological properties of substitutional solid solution (Ti, Al)N films prepared by reactive magnetron sputtering显示文摘 | Chu K Shum P W Shen Y G | 2006 | Materials Science and Engineering B2006，131，： | 1 |
| 11 | Mechanical and tribological properties of amorphous carbon films deposited on implanted steel substrates显示文摘 | Shum P W Zhou Z F Li K Y | 2004 | Thin Solid Films2004，458，12： | 1 |
| 12 | High temperature oxi- dation of CrTiAIN hard coatings prepared by unbalanced magnetron sputtering 显示文摘 | Zhou Z F Tam P L Shum P W | 2009 | Thin Solid Films2009，517，17： | 1 |
| 13 | Criterions of supersolvability for products of supersolvable groups 显示文摘 | GUO W B SHUM K P SKIBA A N | 2004 | Siberian Math2004，45，1： | 1 |
| 14 | Structural and Mechani- cal Properties of Titanium-Aluminium NitrideFilms Deposited by Reactive Close-Field Unbalanced Magnetron Sputtering 显示文摘 | Shum P W Li K Y Zhou Z F | 2004 | Surf Coat Technol2004，185，23： | 1 |
| 15 | Tribological performance of amorphous carbon films prepared on steel substrates with carbon implantation pre-treatment 显示文摘 | Shum P W Zhou Z F Li K Y | 2004 | Wear2004，256，34： | 1 |
| 16 | Structural,Mechanical,and Tribological Studies of Cr-Ti-Al-N Coating with Different Chemical Compositions显示文摘 | Tam P L Zhou Z F Shum P W | 2008 | Thin Solid Films2008，516，： | 1 |
| 17 | Criterions of supersoluabili-ty for product of supersolvable groups显示文摘 | Guo W B Shum K P Skiba A N | 2004 | Siberian Math2004，45，1： | 1 |
| 18 | XPS,AFM and Nanoindentation Studies of Ti1-xAlxN Films Synthesized by Reactive Unbalanced Magnetron Sputtering显示文摘 | Shum P W Zhou Z F Li K Y | 2003 | Materials Science and Engineering B2003，100，： | 1 |
| 19 | One-dimensional anisotropic photonic crystal with a tunable band gap显示文摘 | ALAGAPPAN SUN G X W SHUM P | 2006 | Journal Optical Society of America B2006，23，1： | 1 |
| 20 | Structural,mechanical,and tribological studies of Cr-Ti-Al-Ncoating with different chemical compositions显示文摘 | Tam P L Zhou Z F Shum P W | 2008 | ThinSolid Film2008，516，16： | 1 |
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