原位反应烧结法制备MgAlON复合材料

发布时间：2018-06-24 10:44

本文选题：原位反应烧结 + 烧结性能　；参考：《人工晶体学报》2016年05期

【摘要】：实验原料选用高纯电熔镁砂(粒径3~1 mm);α-Al_2O_3(活性)微粉(粒径≤5μm);电熔镁铝尖晶石(粒径≤1mm);Al粉(粒径≤0.088 mm);化学纯Mg O(粒径≤0.04μm)和少量的活性材料,氮化气氛下原位反应制备MgAlON复合材料,考察了氮化烧结后试样的常规性能、物相组成、显微结构。结果表明:1500℃下,氮化气氛中耐火基质料为Al-Al_2O_3-Mg O系的混合粉可以通过原位反应制备MgAlON复合材料;骨料种类的不同,不影响MgAlON矿相的生成。且Mg Al2O4-MgAlON材料的烧结性能及氮化效果较好,常温强度也较高。试样骨架结构是骨料大颗粒在烧结中形成的,骨架中填充着反应合成的MgAlON晶粒和骨料小颗粒,使得烧成后的试样内部结构致密;微晶结构以及晶须的存在有利于提高材料的常温力学性能。
[Abstract]:The experimental materials used high pure electric magnesia (particle size 3~1 mm), alpha -Al_2O_3 (active) micro powder (particle diameter less than 5 u m), fused magnesia aluminum spinel (particle diameter less than 1mm), Al powder (particle diameter less than 0.088 mm), chemical pure Mg O (particle diameter less than 0.04 mu m) and a small amount of active material, and in situ reaction under nitriding atmosphere to prepare a MgAlON composite material, and investigate the routine of the specimen after nitriding sintering. Performance, phase composition and microstructure. The results show that the MgAlON composite can be prepared by in-situ reaction by the in-situ reaction of the refractory matrix material of Al-Al_2O_3-Mg O system in the nitriding atmosphere at 1500 C, and the different types of aggregates do not affect the formation of MgAlON ore phase. And the sintering and nitriding effect of Mg Al2O4-MgAlON material is better, and the normal temperature strength is also good. The skeleton structure of the specimen is formed in the sintering of large aggregate particles. The MgAlON grains and small aggregate particles are filled in the skeleton, which makes the internal structure of the specimen burned after the sintering is compact, and the microcrystalline structure and the existence of the whisker are beneficial to the improvement of the mechanical properties of the material at normal temperature.
【作者单位】：黄河科技学院;摩根新材料上海有限公司;
【基金】：河南省高等学校重点科研项目(16A430019)
【分类号】：TB33

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