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采用具有不同碳氧含量的初始粉末,利用真空液相烧结制备93W-4.6Ni-1.9Fe-0.5Co合金试样,研究碳氧含量的变化及其平衡反应对合金力学性能与组织的影响。结果表明,压坯在真空高温烧结过程中,原料自身含有的碳具有较强的脱氧能力,通过碳氧反应可减少合金中的氧、碳含量,阻止氧化物、碳化物夹杂的生成,在钨颗粒与粘接相之间形成牢固的界面。当合金总氧含量低于500μg/g时,合金的力学性能显著提高。
93W-4.6Ni-1.9Fe-0.5Co alloy samples were prepared by vacuum liquid phase sintering with initial powders with different carbon and oxygen contents. The effects of carbon and oxygen content and their equilibrium reaction on the mechanical properties and microstructure of the alloy were investigated. The results show that during the process of vacuum sintering at high temperature, the carbon contained in the raw material has strong deoxidation ability. The oxygen and carbon content in the alloy can be reduced by the carbon and oxygen reaction to prevent the formation of oxides and carbide inclusions. The particles form a solid interface with the adhesive phase. When the total oxygen content of the alloy is less than 500μg / g, the mechanical properties of the alloy are significantly improved.