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Wang X.-G.,Xian University of Science and Technology | Wang X.-G.,Shaanxi Xike Bor Technology Co. | Liu L.,Xian University of Science and Technology | Wang J.-B.,Xian University of Science and Technology | And 4 more authors.
Jingangshi yu Moliao Moju Gongcheng/Diamond and Abrasives Engineering | Year: 2013

By low-temperature pressureless sintering technique, β-SiC superfinishing stones were prepared using borosilicate glass, feldspar and corundum as the sintering-aids, naphthalene as the porous agent and β-SiC as the main ingredient. The phase composition, microstructure morphotogy, flexural strength, and hardness of the prepared superfinishing stones were characterized by XRD, SEM, Archimedes, three-point bending and Rockwell hardness, which explored effects of borosilicate glass content on the porosity, the density, the flexural strength and the hardness of superfinishing stone samples. The results showed that the porosity, density, flexural strength, Rockwell hardness, borosilicate glass mass fraction of β-SiC superfinishing stone was 53.9%, 1.21 g/cm3, 25.8 MPa, 43.2 HRB and 9% Respectively. Its superfinishing allowances was 8 μm and could meet the machining requirements. Source

Xie B.,Xian University of Science and Technology | Xie B.,Silicon Energy | Wang X.-G.,Xian University of Science and Technology | Wang X.-G.,Silicon Energy | And 7 more authors.
Zhuzao/Foundry | Year: 2013

According to the problems existing in the industrialization of SiC/Al in domestic currently, SiC preforms were prepared by compression molding with W20 and W60 β-SiC powders, respectively. The SiCp/Al composites with relative density of 96%-98% and volume fraction of 55%-72% were fabricatedbybottom-vacuum negative pressure infiltration. The results of XRD, SEM, CT and CTE analysis indicate that MgAl2O4 spinel phase exists in the composites, but A14C3 brittle phase is not clearly observed. Furthermore, the composites have homogeneous microstructure with fewer defects. The coefficient of thermal expansion with volume fraction of 72% SiC can reach 6.9 1×10-6 K-1 and the thermal conductivity is 164.8 W/(m·K) at the normal temperature, while the coefficient of thermal expansion of those with volume fraction of 65% SiC is 7.31×10-6 K-1 and the thermal conductivity is 172.7 W/(m·K). Source

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