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采用DS-5M图像分析仪分析了不同TiB2含量的Ti3AlC2/TiB2复合材料微观晶粒大小和分布情况,分析结果表明,TiB2体积含量为10%的烧结样品晶粒发育较完善,分布也较均匀,随着TiB2含量的增加,层状晶粒的生长受到进一步的抑制,晶粒尺寸明显变小。采用阿基米德常数法测定烧结试样的密度,发现TiB2体积含量为10%的烧结样品相对密度最大,达到99.07%,TiB2体积比含量超过10%,相对密度逐渐减小;SPS烧结过程中TiB2体积含量少于10%时,样品呈现一个很窄的快速致密化阶段,随着TiB2含量的增加,原料发生反应所需温度升高和反应过程所需时间增加,降低了材料的致密化程度。可见图像分析复合材料微观晶粒的情况能很好地呼应材料宏观性能测试结果,提供了一种有效的测试分析手段。
The size and distribution of microscopic grains of Ti3AlC2 / TiB2 composites with different content of TiB2 were analyzed by DS-5M image analyzer. The results showed that the grain size of sintered samples with TiB2 content of 10% was well developed and the distribution was even, With the increase of TiB2 content, the growth of layered grains is further inhibited and the grain size is obviously smaller. The density of the sintered sample was measured by Archimedes’ constant method. It was found that the relative density of the sintered sample with TiB2 volume content of 10% was the highest, reaching 99.07% and the volume fraction of TiB2 exceeded 10%, and the relative density decreased gradually. During SPS sintering When the volume fraction of TiB2 is less than 10%, the sample exhibits a very narrow and rapid densification stage. With the increase of TiB2 content, the temperature required for reaction of the raw materials increases and the time required for the reaction process increases, reducing the degree of densification of the material . Visible image analysis of composite microcrystalline grains can well echo the macroscopic properties of the material test results, provides an effective means of testing and analysis.