含钛铜基合金对立方氮化硼磨具材料微晶玻璃结合剂烧结机理、元素扩散行为及物理性能的影响

Effects of Ti Containing Cu-Based Alloy on Sintering Mechanism, Element Diffusion Behavior and Physical Properties of Glass-Ceramic Bond for Cubic Boron Nitride Abrasive Tool Materials.

作者信息

Meng Xianglong, Xiao Bing, Wu Hengheng

机构信息

College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.

School of Mechanical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China.

出版信息

Micromachines (Basel). 2023 Jan 24;14(2):303. doi: 10.3390/mi14020303.

DOI:10.3390/mi14020303

PMID:36838003

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9964834/

Abstract

Ti containing Cu-based (TC) alloy reinforced glass-ceramic bond was fabricated for cubic boron nitride (CBN) abrasive tool materials, and its crystal composition, phase transformation, sintering activation energy, microstructure, element diffusion mathematical model, physical properties, and the bonding mechanism between the TC alloy reinforced glass-ceramic bond and the CBN grains were systematically investigated. The results showed that the structure, composition and sintering behavior of glass-ceramic were influenced by TC alloy adding. The generated TiO affected obviously the precipitation of β-quartz solid solution LiAlSiO, thus improving the relative crystallinity, mechanical strength and thermal properties. By establishing the mathematical model for element diffusion, the element diffusion coefficients of Ti and Cu were 7.82 and 6.98 × 10 cm/s, respectively, which indicated that Ti diffused better than Cu in glass-ceramic. Thus, Ti formed a strong Ti-N chemical bond on the CBN surface, which contributed to improving the wettability and bonding strength between CBN and glass-ceramic bond. After adding TC alloy, the physical properties of the composite were optimized. The porosity, bulk density, flexural strength, Rockwell hardness, CTE, and thermal conductivity of the composites were 5.8%, 3.16 g/cm, 175 MPa, 90.5 HRC, 3.74 × 10 °C, and 5.84 W/(m·k), respectively.

摘要

制备了用于立方氮化硼（CBN）磨具材料的含钛铜基（TC）合金增强微晶玻璃结合剂，并对其晶体组成、相变、烧结活化能、微观结构、元素扩散数学模型、物理性能以及TC合金增强微晶玻璃结合剂与CBN磨粒之间的结合机理进行了系统研究。结果表明，添加TC合金会影响微晶玻璃的结构、组成和烧结行为。生成的TiO明显影响β-石英固溶体LiAlSiO的析出，从而提高了相对结晶度、机械强度和热性能。通过建立元素扩散数学模型，Ti和Cu的元素扩散系数分别为7.82和6.98×10 cm/s，这表明Ti在微晶玻璃中的扩散比Cu更好。因此，Ti在CBN表面形成了很强的Ti-N化学键，有助于提高CBN与微晶玻璃结合剂之间的润湿性和结合强度。添加TC合金后，复合材料的物理性能得到优化。复合材料的孔隙率、体积密度、抗弯强度、洛氏硬度、热膨胀系数和热导率分别为5.8%、3.16 g/cm、175 MPa、90.5 HRC、3.74×10 °C和5.84 W/(m·k)。