Synthesis and Pyrolysis of Boron-Containing Polycarbosilane

被引：0

作者：

Ma A. ^{[1
,2
]}

Luo R. ^{[1
]}

Yang J. ^{[2
]}

Chen W. ^{[2
]}

Feng C. ^{[2
]}

机构：

[1] School of Physics and Nuclear Energy Engineering, Beihang University, Beijing

[2] School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an

来源：

Ma, Aijie (maaijie@xatu.edu.cn) | 2018年 / Sichuan University卷 / 34期

关键词：

Modification; Polycarbosilane; Precursor for silicon carbide; Pyrolysis;

D O I：

10.16865/j.cnki.1000-7555.2018.04.019

中图分类号：

学科分类号：

摘要：

In order to obtain precursor with high ceramic yield and silicon carbide (SiC) products with excellent thermal stability, pinacolborane (PINB) was introduced to modify polycarbosilane (PCS). Dehydrogenation reaction was concerned. Several boron-containing polycarbosilanes (PBCS) were prepared with different mass ratio between PINB and PCS (1: 20, 1: 10, 1: 5). FT-IR, 1H-NMR, TGA and XRD were used to characterize the samples. It demonstrates that boron is introduced to the PCS structure by dehydrogenation reaction as PINB backbone. The introduction of boron might increase the ceramic yield of precursor from 78% to 92%. And the cross-inking reaction of PCS is also enhanced by PINB. Results demonstrate that the pyrolysis process of PBCS includes three stages. Moreover, the growth of SiC crystals is inhibited, due to introduction of boron. And the high temperature heat resistance of B-containing SiC ceramics is enhanced to 1400℃. © 2018, Editorial Board of Polymer Materials Science & Engineering. All right reserved.

引用

页码：110 / 115

页数：5