Experimental study on the influence of binders on plastic deformation during sintering of cubic boron nitride powder under high pressure and high temperature

TL;DR

This study investigates how different binders, titanium carbonitride and titanium nitride, affect the plastic deformation of cubic boron nitride during high-pressure, high-temperature sintering, revealing binder-dependent differences in deformation behavior.

Contribution

It provides experimental insights into the influence of specific binders on the deformation mechanisms of cBN during sintering under HP-HT conditions.

Findings

Titanium carbonitride binder enhances plastic deformation of cBN.

Different binders lead to distinct stress concentration and dislocation mobility.

Binder choice affects the microstructural evolution during sintering.

Abstract

In this work, sintered polycrystalline cubic boron nitride (cBN) compacts, with titanium carbonitride (TiC0.7N0.3) and titanium nitride (TiN), respectively, as binders, were prepared at temperature of 1450{\deg}C and pressure of 5.5 GPa during 3 minutes, and the influence of binders on the plastic deformation of cBN powder due to the sintering process was experimentally investigated by X-ray diffraction (XRD) analysis. It was shown that the sintered compact with titanium carbonitride as a binder displays more intense plastic deformation of cBN grains than that with titanium nitride binder. This result indicated that if the binders are different, then products formed during sintering of cBN powders under high pressure and high temperature (HP-HT) are different so that the stress concentration at the cBN grain boundaries and a pinning effect, reducing the mobility of the dislocations and preventing annealing, are different in two cases.