B_4C量对TiC-TiB_2颗粒增强金属基复合材料涂层制备的影响

Influence of B_4C Content on Formation Coating of Metal Matrix Composite Reinforced by In-situ TiC-TiB_2 Particulates

对Al-B4C体系下B4C的量与原位内生TiC-TiB2颗粒增强金属基复合材料涂层制备之间的关系进行了研究。结果表明,Al:B4C质量比大于9:1可制备出高质量的TiC-TiB2颗粒增强金属基复合材料涂层,提高Al:B4C质量比虽有利于涂层的制备,但不利于涂层中增强相体积分数的提高。Al在涂层制备过程中的作用主要是降低单位体积内参加反应物的量、降低生成TiC-TiB2反应的门槛温度和充当除氧剂的作用,为涂层的制备提供了一种更加便利的途径。

The relationship between the B4C content and the fabrication of metal matrix composite coating reinforced by in-situ TiC-TiB2 particulates in Al-B4C system were investigated. The results show that the critical mixing ratio of Al-to-B4C for the formation of particulates reinforced metal matrix composite coating is above 9：1, although increasing the mixing ratio of Al-to-B4C is advantageous to formation of the composite coating, it is adverse to improving the volume fraction of reinforcements. The role of the aluminum during the formation of the composite coating serves not only as decreasing the reactants content per unit volume and the reactive temperature for the formation of TiC-TiB2 particulates, but also as the deoxidant agent. The addition of aluminum provides a much easier route for the TiC and TiB2 formation in the metal matrix composite coating.