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以TiO2,C和Al粉为原料,利用接触反应法原位合成10%TiC-Al2O3/Al基复合材料。采用SEM、XRD和电化学测试等研究稀土La对复合材料微观组织和耐蚀性的影响。结果表明,复合材料中La最佳添加量为0.2%,此时复合材料中生成的TiC和Al2O3颗粒数量增多,颗粒分布均匀,棒状A13Ti被钝化,复合材料组织相对较好,自腐蚀电流密度相对较小,为4.053×10-5A·cm-2,与未添加La复合材料相比降低81%,容抗弧半径相对较大,复合材料耐腐蚀性相对较好。
In situ synthesis of 10% TiC-Al2O3 / Al matrix composites by contact reaction with TiO2, C and Al powders as raw materials. The effects of rare earth La on the microstructure and corrosion resistance of the composites were investigated by SEM, XRD and electrochemical tests. The results show that the best addition amount of La in the composite is 0.2%, the number of TiC and Al2O3 particles in the composite material increases, the particles are distributed uniformly, the rod-shaped A13Ti is passivated, the composite structure is relatively good and the self-corrosion current density It is 4.053 × 10-5A · cm-2, which is 81% lower than that of the non-added La composite. The arc-tolerant radius is relatively large, and the corrosion resistance of the composite is relatively good.