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) (State Key Laboratory of Powder Metallurgy (Central South University), Changsha 410083, China)Abstract:Before densification by chemical vapor infiltration, carbon or SiC nanofibers were grown... the ordered deposition of pyrocarbon and adjust the interface bonding between pyrocarbon and carbon fibers during the infiltration.Key words:carbon nanofiber; SiC nanofiber; pyrocarbon; interface......
materials, the SiC inner coating was prepared by pack cementation. The powder compositions were as follows: 70%-80% Si, 10%-20% graphite and 5%-15% Al2O3. Al2O3 was used as penetration enhancer...Trans. Nonferrous Met. Soc. China 23(2013) 2107-2112 Double SiC coating on carbon/carbon composites against oxidation by a two-step method Can SUN, He-jun LI, Qian-gang FU, Jia-ping ZHANG, Han PENG......
of A357-SiC nanocomposites. In the first level, a blend of SiC nanoparticles (average size of 50 nm) and pure aluminum powder (average size of 50 μm) were pressed into a disk (diameter of 10 mm) under 15 MPa... random experiments obtained by DX-7 software were performed. By this method, A357-SiC nanocomposites with 0.5, 1.0 and 1.5 wt.% SiC were fabricated at three different frequencies (10, 35 and 60 Hz......
composite powder[7-8]. In recent years, some works have been focused on the use of the carbothermal reduction method to synthesize composites such as Al2O3-SiC[9], mullite-SiC[10], mullite-ZrO2-SiC[10... and discussion 3.1. Effect of heating temperature on synthesis of ZrO2-SiC composite powder As shown in Fig.1 the synthesized ZrO2-SiC composite powder includes ZrO2, SiC and ZrSiO4 phases when the samples......
loading of 10% slurry constituting of tert-butyl alcohol, acrylamide, SiC powder and sintering additives. The effects of two kinds of sintering additives, Al2O3 and Al2O3+SiO2, on the porosity...文章编号:1004-0609(2011)02-0430-06 烧结助剂对高气孔率SiC陶瓷结构和性能的影响 王少锋1, 2,汪长安2,孙加林1,周立忠2, 刘伟渊2,黄 勇2 (1. 北京科技大学 材料学院,北京 100083； 2. 清华大学 材料科学与工程系 新型陶瓷与精细工艺国家重点实验室,北京 100084) 摘 要:由叔丁醇,丙烯酰胺和SiC粉及烧结助......
. The results show that, the powder obtained consists of spherical particles of 300-400 nm in diameter, which are composed of SiC and Al2O3 microcrystal with the grain size of approximately 45 nm. The results...″ is the imaginary part of complex permittivity. Key words: sol-gel method; carbothermal reduction; SiC-Al2O3; composite powder; microwave permittivity 1 Introduction Silicon carbide (SiC......
Trans. Nonferrous Met. Soc. China 22(2012) 1930-1938 Wetting of pure aluminium on graphite, SiC and Al2O3 in aluminium filtration BAO Sarina1, TANG Kai2, Anne KVITHYLD2, Thorvald ENGH1, Merete... of aluminium. The contact angles of molten aluminium on alumina, SiC and graphite were measured under 10-8 bar high vacuum in the temperature range of 1000-1300 ℃. To describe the wetting behaviour of the Al......
and powder metallurgy was proposed. 2) The microstructure of the ceramic matrix composites prepared by this technology with Al/SiC is homogeneous, the hardness is high and the tensile strength is high...]Schiavon M A, Radovanovic E, Yoshida I V P. Microstructural characterization of monolithic ceramic matrix composites from polysiloxane and SiC powder [J]. Powder Technology, 2002, 123(6): 232-241. [19......
] investigated the effects of SiC nano-particles addition in FSW of AA5052. They reported some improper SiC nano-powder distribution in the premature fracture of the workpieces. SUN and FUJII [30] reported... sheets were somehow tricky, this was done to eliminate the powder spills. Fig. 2 Schematic of utilized sheets for addition of SiC nano-particles Also, one pass of the friction stir processing......
Commercially available SiC powder (mean diameter 4 μm, purity>99%) was used (Fig. 1). AA5083-H32 plates were used in this work. Its chemical composition (mass fraction) was 0.23% Si, 0.27% Fe, 0.08% Cu, 0.74... above, in the case of FSW with the powder, two factors are involved in the enhancement of the hardness: the reduction of the grain size and the presence of the reinforcing SiC particles in the aluminum......
