碳纳米管对混合粒径PcBN复合材料性能的影响
Effect of CNTs on properties of PcBN composites with mixed particle size
肖长江 1马金明 1陶宏均 2张群飞 1曹剑锋 3李远 3周世杰 4唐昱霖 4陈亚超 5栗正新 1董清妍1
作者信息
- 1. 河南工业大学材料科学与工程学院,郑州 450001
- 2. 中原内配集团鼎锐科技有限公司,河南焦作 454750
- 3. 精工锐意科技(河南)有限公司,郑州 450001
- 4. 郑州沃德超硬材料有限公司,郑州 450001
- 5. 郑州海科研磨工具有限公司,郑州 450001
- 折叠
摘要
为提高高温高压制备的聚晶立方氮化硼(PcBN)复合材料的性能,以颗粒尺寸分别为0～0.5μm和0.5～1.0 μm的混合粒径立方氮化硼(cBN)为原材料,Al-Ti-Al2O3为结合剂,加入不同质量分数的碳纳米管,在高温高压条件下烧结制备PcBN复合材料,研究碳纳米管质量分数对PcBN复合材料结构和性能的影响.结果表明:添加碳纳米管后,PcBN和碳纳米管间没有发生化学反应,碳纳米管以增强体的形式存在于复合材料内部;复合材料较致密,碳纳米管的添加使PcBN的相对密度先增大后减小.当碳纳米管添加质量分数为1.5％时,PcBN的相对密度有最大值97.9％,同时PcBN有最大的显微硬度和断裂韧性,分别为3 892HV和6.82 MPa·m1/2;当碳纳米管的添加质量分数为1.0％时,PcBN有最大的抗弯强度和磨耗比,分别为584 MPa和6 873.碳纳米管拔出和桥连作用提高了 PcBN复合材料的力学性能.
Abstract
To improve the performance of PcBN composites prepared under high temperature and high pressure,mixed cBN particle sizes ranging from 0 to 0.5 μm and 0.5 to 1.0 μm were used as the raw material,Al-Ti-Al2O3 was used as the binder and the carbon nanotubes with different contents were added.The PcBN composites were prepared by sinter-ing under high temperature and high pressure conditions.The effect of carbon nanotube content on the structure and properties of PcBN composites was investigated.The results show that there is no chemical reaction between PcBN and carbon nanotubes after the addition of carbon nanotubes,and the carbon nanotubes exist in the form of reinforcement in-side the composite.The composite material is relatively dense,and the relative density of PcBN increases first and then decreases with the addition of carbon nanotubes.When the mass fraction of carbon nanotubes added is 1.5％,the relat-ive density of PcBN reaches its maximum value of 97.9％,while PcBN has the maximum microhardness and fracture toughness of 3 892 HV and 6.82 MPa·m1/2,respectively.When the mass fraction of carbon nanotubes added is 1.0％,PcBN has the maximum bending strength and wear ratio,which are 584 MPa and 6 873 MPa,respectively.The pull-out and bridging effects of carbon nanotubes improve the mechanical properties of PcBN composites.
关键词
聚晶立方氮化硼/混合粒径/碳纳米管/高温高压/力学性能Key words
polycrystalline cubic boron nitride(PcBN)/mixed particle size/carbon nanotubes(CNTs)/high temperat-ure and high pressure(HTHP)/mechanical property引用本文复制引用
基金项目
工信部科技高质量发展项目(203ZS20230005)
河南省科技重大专项(221100230100)
河南省重点研发专项(2024)()
郑州市重大科技专项(2021KJZX0062)
出版年
2024
国家科技期刊平台
NSTL
万方数据