This paper reports the development of TiCN - SiC- TiN - Cr₃C₂ - Co cermet modified with B₄C for cutting tool applications. Cermets of three different composition with varying B₄C in TiCN - SiC - TiN - Cr₃C₂ - Co were fabricated for a study of addition of B₄C on hardness and toughness. The cermet pellets were sintered using Spark Plasma Sintering (SPS) at 50 MPa pressure, 1500 °C temperature at a heating rate of 100 °C/min with 10mins soaking with pulse rate of 12/2 ms. Microstructure examination revealed a typical core-rim structure. Vickers hardness test was done at a load of 30 kg and duration of 10s. Fracture toughness was computed using crack length data measured from the hardness test. The cermet with composition 65% TiCN - 15% SiC - 5% TiN - 5% Cr₃C₂–10% Co showed high hardness of 16.2 GPa and toughness of 10.7 MPa √m and 50% TiCN - 15% SiC - 5% TiN - 5% Cr₃C₂–10% Co - 15% B₄C exhibited high fracture toughness of 16.5 MPa √m with hardness value of 12 GPa. The addition of B₄C greatly enhanced the toughness value and reduced the hardness value slightly.

本文报道了用切削刀具应用B ₄ C改性的TiCN-SiC- TiN-Cr ₃ C ₂ -Co金属陶瓷的开发。制备了TiCN-SiC-TiN-Cr ₃ C ₂ -Co中三种不同的B ₄ C组成的金属陶瓷用于研究B ₄的添加。C关于硬度和韧性。用火花等离子体烧结（SPS）在50MPa压力，1500℃温度下以100℃/ min的加热速率烧结金属陶瓷丸粒，并以12 / 2ms的脉冲速率浸泡10分钟。显微组织检查显示出典型的核心-边缘结构。维氏硬度测试是在30 kg的负载和10s的持续时间下进行的。使用从硬度测试测得的裂纹长度数据计算断裂韧性。成分为65％TiCN-15％SiC-5％TiN-5％Cr ₃ C ₂ -10％Co的金属陶瓷显示出16.2 GPa的高硬度和10.7 MPa√m的韧性，以及50％TiCN-15％SiC-5％的金属陶瓷TiN-5％Cr ₃ C ₂ –10％Co-15％B ₄C表现出16.5 MPa√m的高断裂韧性，硬度值为12 GPa。B ₄ C的添加极大地提高了韧性值，并稍微降低了硬度值。