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by powder metallurgy sintering process and infiltration process with 48%-52% copper. Their friction and wear properties were studied with help of a pin-disc type wear apparatus. The experiment results showed... will augment their wear mass loss. The mass loss of the CuCr alloy made by powder metallurgy process is relatively low at 20N load and the loss of that made by infiltration process is relatively low......
at room temperature by pulsed XeCl excimer laser (λ=308 nm) ablation of high-purity pyrolytic graphite targets at different nitrogen pressure. The deposition system had a high-vacuum stainless steel... carbon (DLC) films were prepared by PLD process using 308 nm(XeCl) laser beam with high power (500 W) and high frequency(300 Hz). The effects of nitrogen pressure on the structure and properties......
into vacuum furnace. The feed was heated to different reaction temperatures at a heating rate of 10 °C/min and the temperature was held for 4 h when the system pressure was 50 Pa. Then the vacuum... the system pressure declines. Therefore, the preparation of TiC in vacuum is easier than that at atmospheric pressure. What’s more, large amounts of TiC form easily for the gas CO escapes fast from raw......
; accepted 28 July 2014 Abstract: Two multi-step (two-step and three-step) slow shot speeds were used in the vacuum die casting process of AZ91D magnesium alloy. The vacuum pressure variation in the die... results demonstrate that, the vacuum pressure in the die cavity at the beginning of mold filling is significantly reduced by using three-step slow shot speed, resulting in a low gas porosity level......
′-Ni3Al coatings on Ni substrates were developed by the conversion of electrodeposited Ni-Al-Y2O3 films with dispersed Al microparticles in Ni matrix into Ni3Al by vacuum annealing at 800 ℃ for 3 h. For comparison, Y2O3-free γ-Ni+γ ′-Ni3Al coatings with a similar Al content were also prepared by vacuum annealing the electrodeposited microparticle-dispersed composite coatings of Ni-Al under the same......
and vacuum-high-pressure switch. It can also be used as wear resistant material such as bearing, carriage, screw bolt, and high tensile-strength cable. Cu-Cr alloy is often melted in vacuum[4] because... Microstructure and properties of Cu-0.6Cr alloy after vacuum continuous casting TSAI De-chang(蔡德昌)1, HWANG Weng-sing(黄文星)1, CHEN Siang-yong(陈向永)2, KANG Jin-sing(康进兴)2, JIANG Cheng-xue(蒋承学)2 1......
PREPARATION AND PROPERTIES OF Ni-Cr AND Fe-Cr-Al FILMS BY VACUUM EVAPORATION C.M.Li1,X.W.Shi1,Z.Y.Liu1,D.C.Zeng1 (1.Institute of Materials Science & Technology, College of Mechanical Engineering, South China University of Technology, Guangzhou 510640, China) Abstract:Ni-Cr and Fe-Cr-Al films deposited on the Al2O3 substrate are studied by a method of vacuum evaporation in this paper. Influence......
test was carried out to validate it. The results show that the particles sedimentation decreases the porosity of dump and increases the resistance of seepage. To keep a fix flux and fluctuant pressure, the particles would deposit within the 20 cm zone along the streamline, and the flow pressure increases with prolonging time. On the other hand, to keep a fix pressure, the flow velocity also decreases......
Vacuum brazing of TiB2 cermet to TiAl-based alloys using Ag-Cu-Zn filler metalLI Zhuo-ran(李卓然), FENG Ji-cai(冯吉才), CAO Jian(曹 健)(State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001, China)Abstract:Vacuum brazing of TiB2 cermet to TiAl-based alloy was carried out at 1223K for 5-30min using Ag-Cu-Zn filler metal. The microstructural analyses......
层-Cu的界面结构.与Diamond/Cu-Cr复合材料相比界面处增加了Cr层,材料的热导率仅为279W·m~(-1)·K~(-1),但均高于Diamond/Cu复合材料的热导率. 关键词:Diamond/Cu复合材料; 界面; 热导率; Cr; 压力浸渗; Diamond/Cu composites; interface; thermal conductivity; Cr; pressure infiltration process; [全文内容正在添加中] ......
