【摘要】 采用非等温DSC、TG等研究了SiBCN陶瓷先驱体-聚硅硼氮烷（PBSZ）的固化、陶瓷化行为,运用FTIR、XRD、SEM等手段表征了PBSZ先驱体在不同温度的裂解产物结构和微观形貌。通过Kissinger、Crane方程得到PBSZ先驱体的固化动力学参数:活化能Ea=243.27 kJ/mol,反应级数n=0.958。PBSZ先驱体的质量损失主要发生在500～800℃,聚合物中有机基团逐渐减少,基本完成无机化转变。XRD结果表明,在1500℃以下裂解得到的产物为表面致密的非晶态SiBCN结构,而在1800℃下裂解产物发生了晶化转变,得到的陶瓷产物包含Si C、Si₃N₄、BN（C）等相。更多还原

【Abstract】 The ceramization and curing behaviors of polyborosilazane（ PBSZ） precursor for SiBCN ceramic were investigated by differential scanning calorimetry（ DSC） and thermogravimetric analysis（ TGA）.The structures and morphology of ceramic products were characterized by Fourier transform infrared spectrometry（ FTIR）,X-ray diffraction（ XRD） and scanning electron microscope（ SEM）.The kinetic parameters of this precursor were calculated by Kissinger and Crane equations,where the results were summarized as follows: apparent activation energy is 243.27 kJ/mol with reaction order of 0.958.The mass loss for PBSZ mainly occur between 500 ～ 800 ℃,in which organic groups decrease and polymer-to-ceramic transformation complete.The XRD results indicate that the ceramic product maintain amorphous structure below 1500 ℃,and it starts to crystallize above 1800 ℃,resulting in the structure formation of SiC,Si₃N₄ and BN（ C）.更多还原