自蔓延高温合成TiC/Fe金属陶瓷结构复合材料的研究

Study on Self-propagating High Temperature Synthesis of TiC/Fe Cermet Structure Composites

以C、Ti、Fe粉末为原料,采用自蔓延高温合成技术制备TiC/Fe金属陶瓷结构复合材料.笔者研究了稀土的加入及加入量对SHS反应组织形态影响的因素,预制块的压实度对SHS反应强烈程度的影响.实验结果表明:在SHS反应铸造方法合成的TiC/Fe复合材料表面的TiC颗粒呈理想孤立球状分布,Al2O3呈光亮的不规则形状.TiC/Fe表面复合材料结合紧密,从基体到复合层逐渐呈梯度过渡.稀土的加入使高温自蔓延反应组织晶粒得到细化,加入量过高,会抑制自蔓延反应的反应强度和剧烈程度,使表面复合层与基体结合疏松,结合厚度减小.TiC/Fe表面复合材料硬度远远高于基体,且从基体到复合层也呈现梯度分布.

In this paper, C, Ti and Fe powders were used as raw materiAls to prepare TiC/Fe cermet composites by self-propagating high-temperature synthesis. The influence of the addition and addition amount of rare earth on the microstructure of SHS reaction was studied in this paper. The influence of the compaction degree of precast block on the strong degree of SHS reaction. The experimentAl results show that the TiC particles on the surface of the TiC/Fe composites synthesized by the SHS reaction casting method are ideAlly sphericAl and Al 2O 3 has a bright and irregular shape. The TiC/Fe surface composites are tightly bonded and graduAlly transition from the matrix to the composite layer. The addition of rare earth can refine the grains of high-temperature self-propagating reaction microstructure. If the amount of addition is too high, the reaction intensity and severity of the self-propagating reaction will be inhibited, and the surface composite layer will be loosely combined with the matrix, and the combined thickness will be reduced. The hardness of the TiC/Fe surface composite is much higher than that of the matrix, and it Also shows a gradient distribution from the matrix to the composite layer.