氧化铝纤维/红柱石复合材料的制备与性能

Preparation and Properties of Alumina Fiber/Andalusite Composite

笔者针对红柱石和氧化铝纤维广泛的应用前景，通过两者的复合来提高红柱石制品的使用性能，采用传统无压烧结工艺制备氧化铝纤维增强红柱石基复合材料。探讨了红柱石细粉的粒度、氧化铝纤维的加入量和烧成温度对氧化铝纤维增强红柱石基复合材料物理性能以及常温力学性能的影响。结果表明：随着红柱石细粉粒度的降低，氧化铝纤维团聚现象加剧，由于纤维与基质的界面结合力较强，原料粒度的变化对材料常温力学性能影响不大；当氧化铝纤维加入量为5％。10％时，材料的体积密度最大，常温耐压强度和抗折强度最好，超过10％后由于纤维的团聚，材，料的力学性能显著下降；当烧成温度超过1400℃后纤维与基体开始反应，随着烧成温度的进一步提高，纤维遭到破坏的程度加剧。

Aim for the wide apply prospect of alumina fiber and andalusite, in order to improve properties of andalusite production by composites used alumina fiber as reinforced material and andalusite power as matrix, alumina fiber - reinforced andalusite composites was fab- ricated by conventional pressureless sinteringl the influence of particle size of the andalusite power, alumina fiber content and firing temperature on physical and mechanical properties of composites were studied. The results show that agglomerating of fiber aggravate with the decrease of particle size; the influence of particle size on mechanical properties of composites is small because of the strong interface combination;the maximum of bulk density, compressive strength and bending strength appear in the range of 5 % - 10% content of alumina fiber, and mechanical properties decrease remarkably because of fiber agglomerating when. alumina fiber content exceed 10 % ;alumina fibre began to react with matrix when firing temperature exceed 1 400 ℃ ; and the damage of alumina fiber is aggravated with the increasing of firing temperature.