摘要
研究了HfC增强相含量、金属粘结相种类和含量对TiB_(2)基刀具物相组成、显微组织和力学性能的影响。结果表明,不同HfC含量的TiB_(2)基刀具都主要由TiB_(2)、HfC、少量Ni和MoNi4相组成;在烧结过程中,Ni会与Mo发生化学反应而形成少量MoNi4相;当HfC含量达到20%时,TiB_(2)基刀具材料具有最高的抗弯强度、断裂韧性和较高的硬度。对比以纯Ni、纯Co和Ni+Mo为金属粘结相的试样,以Ni-Co合金为粘接相的试样中TiB_(2)和HfC相分布更加均匀、润湿效果更好;此时TiB_(2)基刀具材料的抗弯强度、断裂韧性和硬度分别为834 MPa、9.50 MPa·m^(1/2)和22.92 GPa,具有最佳的综合力学性能。
The effects of the content of reinforcement phase,the type and content of metal bonding phase on the phase composition,microstructure and mechanical properties of TiB_(2)based cutting tools were studied.The results show that TiB_(2)based cutting tools with different HfC content are mainly composed of TiB_(2),HfC,a small amount of Ni and MoNi4 phases;in the sintering process,Ni will react with Mo to form a small amount of MoNi4 phases.When the HfC content reaches 20%,TiB_(2)based cutting tools have the highest bending strength,fracture toughness and high hardness.Compared with the samples with pure Ni as the metal phase,pure Co as the metal phase and Ni+Mo as the metal phase,the TiB_(2)and HfC phases in the samples with Ni and Co as the metal phase have more uniform distribution and better wetting effect.At this time,the bending strength,fracture toughness and hardness of TiB_(2)based tool materials are 834 MPa,9.50 Mpa·M^(1/2)and 22.92 Gpa,respectively,which has the best comprehensive mechanical properties.
作者
张凤国
范晓文
ZHANG Fengguo;FAN Xiaowen(Machinery Department,Hengshui Technician College,Hengshui,053000,China;Department of Mechanical Engineering,Nanjing Vocational and Technical College of Mechatronics,Nanjing 210037,China)
出处
《粉末冶金工业》
CAS
北大核心
2022年第2期52-56,共5页
Powder Metallurgy Industry
基金
国家自然科学基金资助项目(51406437)
河北省高等学校科学技术研究项目(QN2018331)。
