氮化硼纤维的研制

PREPARATION OF BORON NITRIDE CERAMIC FIBER

研究了用先驱体法制备氮化硼（ＢＮ）纤维的全过程。以ＢＣｌ３和（Ｍｅ３Ｓｉ）２ＮＨ为原料直接合成具有纺丝性能的聚硼氮烷，经纺丝、不熔化处理、高温烧结等一系列工艺处理，制得了ＢＮ纤维。纤维的平均直径３６μｍ，连续长度６０ｃｍ，拉伸强度１１０ＭＰａ。探讨了制备工艺过程中的一些基本规律。

A process was studied to make boron nitride(BN) ceramic fiber from polyborazinylamine served as precursor. The manufacture process included the synthesis of polyborazinylamine by BCl_3 with (Me_3Si)_2NH and melt spinning to produce precursor fibers. These fibers were cured under BCl_3 and NH_3, and were pyrolyzed to 1600 ℃ to produce h-BN fibers. The fibers have an average diameter of 36 μm, a continuous length of 60 cm and a tensile strength of 110 MPa. The basic law during the manufacture process has been studied in this paper.