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热力学分析和试验结果证实,KBF4、Ti反应剂以一定的Ti/B原子比混合加入熔体,最终反应生成单一TiB2相,能抑制TiAl3等其它相的产生。在此基础上,分析比较了反应剂混合粉以预制块形式加入、气流载入熔体两工艺条件下的TiB2颗粒分布、大小。结果表明:通过氩气流载入反应混合粉,并快速搅拌熔体,可克服TiB2颗粒在晶界的团聚,细化颗粒,获得颗粒小于0.5um、且较均匀分布的TiB2/Al复合材料。
Thermodynamic analysis and experimental results confirm that the KBF4 and Ti reactants are mixed and added to the melt with a certain Ti / B atomic ratio to finally form a single TiB2 phase, which can restrain the generation of other phases such as TiAl3. On this basis, the distribution and size of TiB2 particles were analyzed and compared in the form of prefabricated blocks. The results show that TiB2 / Al composites can be obtained by loading argon gas into the reaction mixture and rapidly stirring the melt to overcome the agglomeration and refinement of TiB2 particles at grain boundaries.