EFFECT OF Ni ON MICROSTRUCTURE AND PROPERTIES OF C-B_4C-SiC COMPOSITE
HUANG Qizhong; YANG Qiaoqin; DU Haiqing; HUANG Boyun';LU Haibo(Institute of Powder Metallurgy Research; Central South University of Technology; Changsha 410083)(Hunan University; Changsha 410082)(Manuscript received 1994-11-04)
Cite this article:
HUANG Qizhong; YANG Qiaoqin; DU Haiqing; HUANG Boyun';LU Haibo(Institute of Powder Metallurgy Research; Central South University of Technology; Changsha 410083)(Hunan University; Changsha 410082)(Manuscript received 1994-11-04). EFFECT OF Ni ON MICROSTRUCTURE AND PROPERTIES OF C-B_4C-SiC COMPOSITE. Acta Metall Sin, 1995, 31(19): 337-340.
Abstract The effect of additive Ni on the microstructure and properties of C-B_4C-SiC composite was studied. X-ray diffraction indicates that Ni reacts along the grain boundaries with SiC, B_4C to form liguid Ni_(4.6)Si_2B. Thus the effective sintering may be accelerated and the growth of grain was controlled. Consequently, the density and strength of the composite increase markedly, and the electric resistance decreases a little. On the other hand, when the composite was oxidized, Ni_(4.6)Si_2 B was first oxidized to form the dense 2NiO·B_2O_3 which wrapts up carbon and B_4C particles, and makes them difficult to oxidize. So the oxidation resistance of the composite increases greatly. (Correspondent: HUANG Qizhong, associate prpfessor Institute of Powder Metallurgy Research, Central South University of Technology, Changsha 410083)
