含TaC的wc - 50% cmo模型合金的结构和磁性能

A. Zaitsev, I. Konyashin, E. N. Avdeenko, N. Shvyndina, E. Levashov
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引用次数: 0

摘要

研究了不同碳含量和添加1,6 - 5,6 wt.% TaC的模型高钴WC-50%Co合金的组织和磁性能。粉末混合物在1420℃液相烧结得到模型合金,其组成为:50%Co + 50%WC + xTaC + yC,其中x = 0;1、6;2、6;3、6;4、6;5,6 wt.%, y = 0;0, 2;0、5 wt. %。结果表明,在所有合金中均存在(Ta,W)C相析出,当TaC浓度达到3.6 wt.%时,(Ta,W)C晶粒呈针状;当TaC浓度达到3.6 wt.%时,(Ta,W)C晶粒呈球形。(Ta,W)C相既位于co -粘结剂内,也沿WC晶界析出。低碳合金的(Ta,W)C相晶格参数范围为(1,6 % TaC合金)0,4438 nm至4,6 % TaC合金(0,4451 nm)。根据EDX分析,钴相中溶解钨的浓度与TaC含量无关,而与总碳含量密切相关,对于高碳、高碳和低碳合金,其浓度分别为7、12和17 wt.%。在低碳和高碳合金中加入TaC,矫顽力增加875 a /m,磁饱和降低5 ~ 10 g·m3/g。实验结果提出了在粘结相中形成分散的含钽析出相的可能性的假设。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
STRUCTURE AND MAGNETIC PROPERTIES OF WC–50%Cо MODEL ALLOYS CONTAINING TaC ADDITIVES
The structure and magnetic properties of model high-cobalt WC–50%Co alloys with different carbon content and 1,6–5,6 wt.% TaC additives are studied. Model alloys are obtained by liquid-phase sintering of powder mixtures at 1420 °C, and their composition is described by the formula: 50%Co + 50%WC + xTaC + yC, where x = 0; 1,6; 2,6; 3,6; 4,6; 5,6 wt.%, y = 0; 0,2; 0,5 wt.%. It is shown that (Ta,W)C phase precipitates are present in all the investigated alloys, whereby at up to 3,6 wt.% TaC concentration the (Ta,W)C grains have a needle shape, and at ³3,6 wt.% TaC concentration the shape of the (Ta,W)C grains becomes spherical. (Ta,W)C phase precipitates are located both in the Co-binder and along the WC grain boundaries. The (Ta,W)C phase lattice parameter in low-carbon alloys lies in the range from 0,4438 nm for the 1,6 % TaC alloy up to 0,4451 nm for the 4,6 % TaC alloy. According to EDX analysis, the concentration of dissolved tungsten in the cobalt phase is independent of the TaC content and strongly depends on the total carbon content, and for alloys with high, elevated and low carbon content it is 7, 12 and 17 wt.%, respectively. TaC addition in alloys with a low and elevated carbon content leads to an increase in coercive force by 875 A/m and a decrease in magnetic saturation by 5–10 Gs·m3/g. The experimental results allowed putting forward a hypothesis about the possibility of forming dispersed tantalumcontaining precipitates in the binder phase.
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