热压烧结制备晶须补强复合材料  

SiC w Reinforced Ceramic Composite by Hot pressing

作　　者：高桂英[1] 陈立富[1] 严勇军 

机构地区：[1]厦门大学材料科学系

出　　处：《厦门大学学报（自然科学版）》1998年第6期880-884,共5页Journal of Xiamen University：Natural Science

基　　金：福建省自然科学基金

摘　　要：通过热压烧结成功地制备了高致密度的ＳｉＣｗ晶须补强ＣＭＡＳ玻璃陶瓷基复合材料．ＳｉＣｗ晶须经超声波分散以后，加入到已球磨好的ＣＭＡＳ粉末与有机添加剂的浆料中，搅拌得到ＳｉＣｗ分散均匀的混合浆料．含有机添加剂的浆料在较低的压力下（２．３７ｋＰａ）挤压通过微孔（＝２５０μｍ），获得ＳｉＣｗ晶须分散均匀并高度取向的纤维状生坯．含晶须２０％的ＣＭＡＳ通过无压烧结，烧结后样品相对密度仅达８０％．但是通过热压烧结就可制备出相对密度达９４．２％的复合材料．SiC w reinforced ceramic composite is fabricated successfully by hot pressing method. The mixture of PAN, DMF and CMAS is homogenized by ball milling. SiC w is immersed into DMF and then ultrasonically dispersed in a separate container. SiC w is then filtered out and the cake is added into the powder slurry. Stirring using a general purpose mechanically stirrer is adequate to produce a homogeneous paste. The paste is kept undisturbed for deaeration and then wet spun using a laboratory spinning apparatus. Continuous fiber is easily extruded at a low extrusion pressure (2.37 kPa) through a small orifice (250 μm). No spinneret blockage or whisker accumulation on the spinneret are found. The resultant filaments are arranged into the desired shapes and finally cold pressed to give the green body. The green body is strong and the fiber arrangements are not disturbed. Hot pressing at 900 ℃, 3 MPa for 10 mins gives a nearly fully dense glass ceramic composite.

关 键 词：CMAS玻璃陶瓷 热压烧结 复合材料 晶须补强 

分 类 号：TB332[一般工业技术—材料科学与工程]