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Study on Oxidation Behavior of (W,Mo) Powders in Air at 400, 500 and
Peizhong Feng,Xuanhui Qu,Xiaohong Wang,Farid Akhtar 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
The oxidation of (W,Mo) powders has been investigated at 400, 500 and for 12.0 hours in air. It was shown that the low temperature oxidation resistance of (W,Mo) was worse than that of , and they showed great changes in mass, volume and colour. Especialy at , the amount of volume expansion of (W,Mo) was as high as about times and color changed from black to yellow after 4.0h with , , (W,Mo) and amorphous as main reaction products. The mass gain and oxidation rate were relatively slower at and than that at .
Microstructure, Properties and Heat Treatment of Steel Bonded TiC Cermets
Farid Akhtar,Guo Shiju,Shah Jawad Ali,Feng Peizhong 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
The binder phase for TiC reinforced steel matrix composite was added in the form of elemental powders and master alloy powders. The microstructures, binder phase variation with TiC content and mechanical properties were evaluated. The addition of a type of binder phase largely effects the microstructure and mechanical properties. The binder phase variation from starting composition was observed with increase in wt% TiC content and this variation was higher when the master alloy powders were used as a binder. The response to heat treatment was decreased with an increase in TiC content due to the shift of binder phase from the starting composition.
Xiaoping Cai,Zhoujun Li,Xinyang Jiao,Jianzhong Wang,Xueqin Kang,Peizhong Feng,Farid Akhtar,Xiaohong Wang 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.10
Due to the high exothermic characteristic of NiAl during the reaction synthesis process from Ni–Al elemental powders, theNiAl intermetallic melts frequently, and the specimens are difficult to maintain their original shape, which leads to the inhomogeneityof the pore size and morphology. To tackle this problem, porous NiAl intermetallic monolith with controllableshape and pore structure was prepared through thermal explosion (TE) using NaCl as space holder. The TE behavior wasrecorded, and the effect of the volume fraction of NaCl on the phase composition, macroscopic feature, pore morphologyand open porosity were investigated. The results showed that NiAl was the main phase in the products, and the specimenwas free from cracking or deforming when NaCl content reached 30 vol%. The interconnected channel and pore windowswere formed, and the open porosity was improved greatly to 63% by adding 50 vol% NaCl. The leachable space holder routeprovides a simple way to control the shape, pore structure and open porosity of the synthesized porous NiAl intermetallic.