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硬质合金的主要成分是高熔点的金属碳化物,而这些碳化物的烧成又是在高温下进行,所以要使其中的残余氧在分析时完全被抽取,存在一定的困难。国外测定难熔金属中氧的方法有真空熔融、惰性气氛熔融等,国内近年来则多采用真空熔融和脉冲加热等方法。我们利用抽取温度很高的直流碳电弧方法测定硬质合金中的氧含量,获得了很好的结果。这种方法的特点是加热温度高,抗吸附性能好,分析速度快,一个试样约需1.5分钟。在分析中采用不加任何浴料的空烧方法,因此免去了各种浴料带来的分析误差。 仪器及操作 1.仪器:采用我院自制的单电极直流碳弧炉抽取气体,用电导方法测定氧含量。仪器流程见图1。
Carbide is the main component of the high melting point of the metal carbides, and these carbides are fired at high temperatures, so to make the residual oxygen in the analysis was completely extracted, there are some difficulties. Foreign determination of refractory metal oxygen in the vacuum melting, inert gas melting, etc., in recent years, more use of vacuum melting and pulse heating and other methods. We use the extraction temperature DC carbon arc method for determination of oxygen content in cemented carbide, obtained good results. This method is characterized by high heating temperature, anti-adsorption performance, analysis speed, a sample takes about 1.5 minutes. In the analysis using no bath of empty burning method, thus eliminating the bath caused by a variety of analytical errors. Equipment and operation 1. Instrument: A single-electrode DC carbon arc furnace made by our institute was used to extract gas and oxygen content was measured by conductance method. Instrument flow shown in Figure 1.