Reactive hot-pressed alumina-boron nitride composites with Y2O3 sintering additive
Reactive hot-pressed alumina-boron nitride composites with Y2O3 sintering additive
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DOI：
10.1111/j.1551-2916.2005.00437.x
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发表时间：
2005-08
影响因子：
3.9
通讯作者：
Guo‐Jun Zhang;H. Kita;N. Kondo;T. Ohji
中科院分区：
文献类型：
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作者：
Guo‐Jun Zhang;H. Kita;N. Kondo;T. Ohji
研究了基于硼酸铝(2Al2O3·B2O3)和氮化铝(AlN)反应的Y2O3添加(0-5wt%)对反应性热压氧化铝(Al2O3)-氮化硼复合材料致密化和性能的影响。致密化过程对Y2O3 的量非常敏感。与未添加Y2O3的材料相对密度79.3理论密度(TD)%相比，添加0.25%Y2O3的材料密度达到98.6TD%。高含量的 Y2O3 添加导致新相 Al5Y3O12 的形成。 Y2O3的添加促进了Al2O3基体的晶粒长大。由于密度高且 Al2O3 粒径小，添加 0.25% Y2O3 的样品表现出最高的弯曲强度，为 540 MPa。
The effect of Y2O3 addition (0–5 wt%) on the densification and properties of reactive hot-pressed alumina (Al2O3)–boron nitride composites based on the reaction between aluminum borate (2Al2O3·B2O3) and aluminum nitride (AlN) was investigated. The densification process was very sensitive to the amount of Y2O3. Compared with a low relative density of 79.3 theoretical density (TD)% for material with no Y2O3 addition, the material density reached 98.6 TD% with 0.25% Y2O3 addition. High Y2O3 additions resulted in the formation of a new phase Al5Y3O12. The grain growth of the Al2O3 matrix was promoted by the Y2O3 addition. Owing to the high density and the small Al2O3 particle size the sample with 0.25% Y2O3 addition demonstrated the highest bending strength of 540 MPa.