Phase Analysis of Cemented Carbide WC-Co Boronised with Yttrium
来源期刊：JOURNAL OF RARE EARTHS2002年第4期
论文作者：刘寿荣 郝建民 褚连青 宋俊亭
Key words：rare earths; cemented carbide WC-Co; vacuum-sintering; rare earth-boronization;
Abstract: Phase analysis for the coated surface with B4C and Y2O3 of cemented carbid e WC-20Co in vacuum-heating was carried out by high-temperature X-ray diffra ction from ambient temperature to 1300 ℃. The results show that, the high-conc entration active boron atoms are released from the boron-supply agent B4C loc ated on the alloy surface and diffused into the γ-phase, leading to forming th e three-element boron-bearing compound W2Co21B6 beside forming boron -bearing compounds on the blank surface. By contrast with boronising only, the element yttrium in boronization broadens the boronising temperature range during vacuum-sintering, catalyzes the decarbonisation decomposition of B4C and prom otes diffusion of active boron atoms into the bulk of WC-Co.
刘寿荣1，郝建民2，褚连青2，宋俊亭1
(1.Tianjin Institute of Cemented Alloy, Tianjin 300222, China;
2.Tianjin Institute of Electronic Material, Tianjin 300192, China)
Abstract:Phase analysis for the coated surface with B4C and Y2O3 of cemented carbid e WC-20Co in vacuum-heating was carried out by high-temperature X-ray diffra ction from ambient temperature to 1300 ℃. The results show that, the high-conc entration active boron atoms are released from the boron-supply agent B4C loc ated on the alloy surface and diffused into the γ-phase, leading to forming th e three-element boron-bearing compound W2Co21B6 beside forming boron -bearing compounds on the blank surface. By contrast with boronising only, the element yttrium in boronization broadens the boronising temperature range during vacuum-sintering, catalyzes the decarbonisation decomposition of B4C and prom otes diffusion of active boron atoms into the bulk of WC-Co.
Key words:rare earths; cemented carbide WC-Co; vacuum-sintering; rare earth-boronization;
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