Densification of Hot-Pressed Composite Materials for Diamond Tools

作者：Zou Qing hua^*

来源：Journal of Superhard Materials, 2011, 33(2): 88-100.

DOI：10.3103/S106345761102002X

• densification
• hot-press forming
• powder metallurgy
• heat capacity
• critical nucleation power
• thermodynamic parameter
• composite for diamond tool

A set of compaction equations suitable for final stage of hot-press forming and sintering is deduced, all physical parameters are analyzed, the analysis results are consistent with a part of empirical formulas. Composites for diamond tools are taken as the subject of the investigation. Under the conditions of hot-forming sintering, the priority is given to the research of the relation between heat capacity C(p) at constant pressure. By combining analysis of the set of compaction equations, we performed differential thermal analysis (DTA) in the differential scanning calorimetry (DSC) mode of heat capacity at constant pressure of pure Co powder, composite powder that consists of 663Cu and 35% Fe-based powder, analyzed the relationship between C(p) and composite densification, and modified C(p) of matrix composites containing 35% Fe-based composite powder for diamond tools in the mode of mixing a rare earth to make it as similar to C(p) of pure Co as possible. Such modified powder is used in practical hot pressing of diamond tool composites and guides it with a set of compaction dynamical equations to radically improve the stability of practical performance (bending strength, hardness, impact ductility, porosity) of powder metallurgy composites and compaction of diamond tool composites.

• 出版日期2011-4
• 单位武汉纺织大学