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采用粉末冶金法制备了Ni3Al做粘结相的Ti(C,N)基金属陶瓷,研究了添加不同含量Ni3Al粘结相的金属陶瓷的力学性能和显微组织并与Ni做粘结相的金属陶瓷进行了对比。结果表明,Ni3Al作粘结相的金属陶瓷综合力学性能总体上不如Ni做粘结相的金属陶瓷,随着金属陶瓷中Ni3Al含量的增加,其洛氏硬度值不断下降,而抗弯强度和断裂韧性却不断增加;显微组织分析表明,Ni3Al做粘结相的金属陶瓷同样具有芯环结构,Ni3Al可以控制环形相的厚度,抑制晶粒异常长大,使硬质相芯相棱角圆润。Ni3Al含量为30wt%左右的金属陶瓷能够兼顾硬度和抗弯强度等力学性能,此时的主要力学性能指标为:抗弯强度1 045±80 MPa,洛氏硬度HRA89.7±0.25,断裂韧性KIC为14.26 MPa·m1/2。
The Ti (C, N) -based cermets with Ni3Al as binder phase were prepared by powder metallurgy. The mechanical properties and microstructure of the cermets with different contents of Ni3Al binder phase were studied. Ceramic was compared. The results show that the overall mechanical properties of cermets with Ni3Al as binder phase are not as good as that of Ni as the binder phase cermets. With the increase of Ni3Al content in cermets, the Rockwell hardness decreases, while the flexural strength and fracture But the toughness is increasing. The microstructure analysis shows that the cermet with Ni3Al as binder phase also has the core-ring structure. The Ni3Al can control the thickness of the annular phase, inhibit the grain growth and make the core of the hard phase rounded and rounded. The cermets with Ni3Al content of about 30wt% can balance the mechanical properties such as hardness and flexural strength. The main mechanical properties at this time are: flexural strength 1 045 ± 80 MPa, Rockwell hardness HRA 89.7 ± 0.25, fracture toughness KIC 14.26 MPa · m1 / 2.