将透辉石和AlTiB中间合金添加到Al_2O_3基体中,采用无压烧结工艺制备了透辉石/AlTiB增韧补强Al_2O_3基陶瓷材料,建立了保温时间对Al_2O_3/透辉石/AlTiB复合陶瓷相对密度影响的预测模型,研究了无压烧结温度和保温时间对透辉石/AlTiB增韧补强Al_2O_3基陶瓷材料力学性能和微观结构的影响.结果表明,所建立的模型较好的预测了保温时间对Al_2O_3/透辉石/AlTiB复合陶瓷相对密度的影响趋势,Al_2O_3/透辉石/AlTiB复合陶瓷最佳烧结工艺为烧结温度1520℃和保温时间180min;烧结工艺对Al_2O_3/透辉石/AlTiB复合陶瓷材料气孔率、晶粒间结合强度、粒径大小和断裂机制等因素产生较大的影响,并由此影响材料的相对密度和力学性能.
Diopside and AlTiB master alloys were introduced in Al_2O_3 and alumina matrix ceramic materials toughened by diopside and A1TiB were fabricated by pressureless sintering. A simple model for Al_2O_3/diopside/AlTiB ceramic composites was proposed to predict the relationship between soaking time and its relatively density. The effect of pressurehss sintefing parameters (sintefing temperature and soaking time) on mechanical properties and microstructure of Al_2O_3/diopside/AlTiB ceramic composites was researched. The results show that the proposed model can be used to predict the trend of relationship between soaking time and relative density for the composites. The best properties of Al_2O_3/diopside/AlTiB ceramic composites are obtained when the composites are sintered at 1520℃ for 180 min. The relative density and performance of Al_2O_3/diopside/AlTiB eeraraie composites are influenced by the porosity, bonding strength between grains, grain size and fracture mechanism, which is significantly affected by sintering parameters.
参考文献
| [1] | Liang A;XUE Wei-chen .Low-temperature sintering of alumina with liquid-forming additives[J].Journal of the Ameriean Ceramic Society,2005,74(08):2011-2013. |
| [2] | Thomas Ostrowski;Jurgen Rodel .Evolution of mechanical properties of porous alumina during free sintering and hot pressing[J].Journal of the American Ceramic Society,1999(11):3080-3086. |
| [3] | Farid Akhtar Synthesis .Mierostructure and mechanical properties of Al_2O_3 reinforced Ni_3Al matrix composite[J].Materials Science and Engineering A,2009,499(1-2):415-4420. |
| [4] | C. Nivot;F. Valdivieso .Microstructure refinement of alumina Optimisation by gas pressure sintering process[J].Ceramics International,2008(7):1595-1602. |
| [5] | Liu CX;Zhang JH;Sun JL;Zhang XH .Pressureless sintering of large-scale fine structural alumina matrix ceramic guideway materials[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2007(1/2):58-63. |
| [6] | Liu C X;Zhang J H;Sun J L et al.Addition of Al-Ti-C master alloys and diopside to improve the performance of alumina matrix ceramic materials[J].Ceramics International,2007,33(07):1149-1154. |
| [7] | Johnson W C;Coble R L .A test of the second phase and impurity segregation medels for magnesia enhanced densificafion of sintered alumina[J].Journal of the American Ceramic Society,1978,61:110-114. |
| [8] | Hae-Won Kim;Young-Hag Koh .Densification and Mechanical Properties of B_4C with Al_2O_3 as a Sintering Aid[J].Journal of the American Ceramic Society,2000(11):2863-2865. |
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