颗粒级配和烧结助剂对碳化硅材料密度的影响

发布时间：2018-03-19 13:42

本文选题：碳化硅陶瓷　切入点：颗粒级配　出处：《耐火材料》2017年04期 　论文类型：期刊论文

【摘要】：为了制备热镀锌内加热器保护套管用致密碳化硅材料,首先,以4种粒度(1、15、60和200μm)的碳化硅粉为原料,配制了10种颗粒级配不同的碳化硅混合料,以相同的工艺压制成型为坯体,检测坯体的体积密度,从中优选出体积密度最大的最佳颗粒级配。然后,取最佳颗粒级配的碳化硅混合粉,分别添加Al_2O_3、Y_2O_3配比不同的3种Al_2O_3-Y_2O_3复合烧结助剂,经混练、成型、烘干、烧成等工序制成碳化硅材料,检测其体积密度和相对密度,并观察其显微结构。结果表明:1)当碳化硅混合粉中200、60、15和1μm碳化硅粉的质量分数分别为55%、20%、20%和5%时,其成型坯体的体积密度最大;2)使用最佳颗粒级配的碳化硅混合粉,当添加的Al_2O_3-Y_2O_3复合烧结助剂中m(Al_2O_3)m(Y_2O_3)=5 12时,所得碳化硅材料的相对密度达到最大,碳化硅完全被玻璃相(钇铝石榴石)所包覆和黏结;3)综合比较,添加10%(w)的m(Al_2O_3)∶m(Y_2O_3)=5∶12的Al_2O_3-Y_2O_3复合烧结助剂的试样,烧后的相对密度最大。
[Abstract]:In order to prepare dense silicon carbide material for hot dip galvanizing inner heater protection tube, 10 kinds of silicon carbide mixtures with different grain gradation were prepared from 4 kinds of silicon carbide powder with different particle sizes (1: 1560 and 200 渭 m). The best particle gradation with the largest volume density was selected from the bulk density of the billet. Then, the silicon carbide mixed powder with the best particle gradation was selected, and three kinds of Al_2O_3-Y_2O_3 composite sintering aids with different ratio of Al2O3T / S _ 2O _ 3 were added, respectively, by mixing, forming and drying. The bulk density and relative density of silicon carbide were measured, and its microstructure was observed. The results showed that when the mass fraction of silicon carbide powder in the mixed silicon carbide powder was 55.20% and 5 渭 m respectively, the results showed that when the mass fraction of silicon carbide powder in the mixed silicon carbide powder was 55% and 20% and 5%, respectively, the mass fraction of silicon carbide powder was 55% and 20% and 5 渭 m, respectively. The volume density of the billet is maximum / 2) the silicon carbide mixed powder with the best particle gradation is used. When the map-Al _ 2O _ 2O _ 3 of the Al_2O_3-Y_2O_3 composite sintering aids is added, the relative density of the obtained silicon carbide material reaches the maximum at 12:00. Compared with the glass phase (yttrium aluminum garnet) completely coated and bonded with silicon carbide, the relative density of the Al_2O_3-Y_2O_3 composite sintering aids after burning is the largest after the addition of 10% Al _ 2O _ 3: M _ 2O _ 3 / M _ T _ 2O _ 3 / M _ T _ 2O _ 3 / M _ T _ 2O _ 3 / 12 Al_2O_3-Y_2O_3 composite sintering auxiliaries.
【作者单位】：北京国网富达科技发展有限责任公司;国家电网公司交流部;
【基金】：国家电网科技资助项目(SGS0F000TTQT1500386)
【分类号】：TQ163.4

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