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采用自蔓延熔铸法制备出CuCr合金.分别考察了反应物配比对合金成分、添加剂CaF2对合金试样宏观形态、不同铸模对合金试样微观结构以及铸模预热温度对合金试样的影响.实验结果表明:反应物的理想配比为w(CuO):w(Cr2O3):w(Al)=100∶140∶160;添加剂CaF2降低了渣的熔点并强化了渣金分离效果;金属铸模中合金冷却速度比较大,所得合金试样的结晶晶粒较细;采用石墨铸模浇注时,提高铸模的预热温度可改善合金的质量,当预热温度为500℃时,可以得到致密的CuCr合金.
The CuCr alloy was prepared by self-propagating casting method.The influences of the composition of the reactants on the alloy composition, the macro morphology of the additive CaF2 alloy, the microstructure of the alloy sample and the preheating temperature of the mold were investigated respectively. The experimental results show that the optimal ratio of reactants is w (Cr2O3): w (Al2O3) = 100: 140: 160. The additive CaF2 decreases the melting point of the slag and strengthens the slag separation effect. The cooling rate of the alloy is relatively large, and the crystal grains of the obtained alloy sample are finer. When the graphite mold is used for casting, increasing the preheating temperature of the mold can improve the quality of the alloy. When the preheating temperature is 500 ° C, dense CuCr alloy can be obtained .