将真空常压烧结方法制得的Cr3C2-Ni-Al复合焊丝堆焊于碳钢表面.分析表明,在堆焊过程中,利用氩弧物理热和Ni-Al反应热,Ni与Al化合反应生成Ni3Al金属间化合物,Cr3C2则发生分解,除少部分[C]与[Cr]固溶于Ni3Al基体中外,大部分反应析出更稳定的Cr7C3相,其尺寸取决于堆焊层中不同区域的冷却环境,较为均匀地分布于Ni3Al基体中.由于Cr在Ni3Al中的固溶度远大于C,加之Cr3C2转化为Cr7C3也造成部分富余的C,结果造成在该Ni3Al表面强化材料焊层中形成石墨相,其密度轻、熔点高,主要偏聚于焊层表层.Cr7C3/Ni3Al复合材料的室温、高温硬度远高于传统高温耐磨材料Stellite合金,该材料有望成为一种新型的高温耐磨表面强化材料.
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