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采用机械合金化和放电等离子烧结(SPS)技术制备了纳米TiC颗粒弥散增强超细晶W-TiC复合材料,对超细晶W-TiC复合材料的显微组织和室温力学性能进行了研究。研究表明,采用SPS工艺于1700℃下烧结1min可获得烧结颗粒结合良好,致密度高达约98.6%的超细晶W-TiC复合材料。通过添加纳米TiC,不仅能抑制W晶粒的长大,还能促进W的致密化。当TiC的加入量为0.7%时(质量分数,下同)可获得晶粒尺寸为0.5μm,抗弯强度和维氏硬度分别为1262MPa,6.45GPa的超细晶W-TiC复合材料。
The ultrafine grained W-TiC nano-TiC composites were prepared by mechanical alloying and spark plasma sintering (SPS). The microstructure and room temperature mechanical properties of the ultrafine grained W-TiC composites were studied. The results showed that the ultrafine grained W-TiC composites with good sintering and high density of about 98.6% can be obtained by SPS process at 1700 ℃ for 1min. By adding nano-TiC, not only can inhibit the growth of W grains, but also promote the densification of W. When the addition of TiC is 0.7% (mass fraction, the same below), the ultrafine grained W-TiC composite with the grain size of 0.5μm, flexural strength and Vickers hardness of 1262MPa and 6.45GPa respectively can be obtained.