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采用高能球磨技术制备W-30%Cu(质量分数)纳米晶粉体,再通过球磨混粉的方法添加不同质量分数的纳米AlN颗粒,然后采用热压烧结法得到W-30Cu/x%AlN复合材料。研究并比较了纳米AlN的加入对材料组织结构、物理以及力学性能的影响。结果表明,W-30Cu/x%AlN复合材料都有较致密和均匀的组织结构,AlN的添加,细化了烧结体中W颗粒;纳米AlN颗粒的添加提高了复合材料的硬度,但是随着AlN纳米颗粒含量的增加,基体晶界上的增强相颗粒分布过多,而使材料的抗弯强度有所下降;少量纳米AlN颗粒(≤1%)的添加有利于W-Cu复合材料的热导率提高,随AlN添加量的增加,复合材料的电阻率升高,电导率下降。
W-30% Cu (mass fraction) nanocrystalline powders were prepared by high-energy ball milling, and then nano-AlN particles with different mass fractions were added by ball milling and then W-30 Cu / x% AlN composite was obtained by hot- material. The effects of nano-AlN addition on the microstructure, physical properties and mechanical properties were studied and compared. The results show that W-30Cu / x% AlN composites have a more compact and uniform microstructure, the addition of AlN, refined the W particles in the sintered body; the addition of nano-AlN particles increased the hardness of the composites, AlN nanoparticles content increases, the matrix particles on the grain boundary phase distribution is too large, leaving the material flexural strength decreased; a small amount of nano AlN particles (≤ 1%) is beneficial to the W-Cu composite heat With the increase of AlN content, the resistivity of the composites increases and the conductivity decreases.