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以Ti、B4C、Ni、Al粉末为原料,通过自蔓延高温反应合成工艺(SHS)制备TiC-TiB2-NiAl复合材料,研究NiAl含量对反应产物的物相组成及组织结构的影响。结果表明:Ti+B4C+Ni+Al粉末SHS反应产物的物相组成为TiB2、TiC和NiAl,随着Ni+Al添加量的增多,NiAl相的衍射峰强度逐渐增强;TiB2、TiC和NiAl在基体中呈现不同的形态,其中TiB2呈六边形或长条状,TiC呈圆形,NiAl填充在TiC和TiB2颗粒之间;随着NiAl含量的增加,TiC-TiB2-NiAl复合材料的晶粒逐渐被细化,致密度和抗压强度均被提高,TiC的形态由不规则形状转变为圆形。复合材料的断裂方式由单纯的沿晶断裂转变为混合的沿晶断裂和穿晶断裂。
TiC-TiB2-NiAl composites were prepared by SHS process using Ti, B4C, Ni and Al powders as raw materials to study the effect of NiAl content on the phase composition and microstructure of the reaction products. The results show that the phase composition of SHS reaction products of Ti + B4C + Ni + Al powders are TiB2, TiC and NiAl. The diffraction intensity of NiAl phase increases with the increase of Ni + Al amount. The diffraction peak intensities of TiB2, TiC and NiAl TiB2 is hexagonal or strip shape, TiC is round and NiAl is filled between TiC and TiB2 particles. With the increase of NiAl content, the grain size of TiC-TiB2-NiAl composite Gradually refined, density and compressive strength are improved, the shape of TiC from irregular shape into a circle. The fracture mode of composites changed from simple intergranular fracture to mixed intergranular fracture and transgranular fracture.