富硼渣制备BN-MgAlON复合材料及氧化机理分析

Synthesis of BN-MgAlON composite material from boron-rich slag and oxidation mechanism

在热力学分析的基础上以富硼渣和炭黑为主要原料合成了BN-MgAlON复合材料,并利用X射线衍射(XRD)、能谱分析(EDS)、扫描电镜(SEM)和DSC-TG等测定了产物的相组成、显微结构和氧化性能。实验结果表明,在实验条件下,富硼渣中的B2O3生成BN、MgO、Al2O3反应生成MgAlON相。BN-MgAlON复合粉体的主要成分为MgAlON、Sialon、BN。以制备的复合粉体为原料,Y2O3为添加剂,烧结制备出了BN-MgAlON复合材料,主要物相为Mg-AlON、Sialon和BN,有少量Al5Y3O12和CaYAl3O7相生成。复合材料氧化温度988℃左右,继续升高温度,试样开始增重,增重速率增大,随着温度的升高,温度高于1320℃时,最大增重率为5.54%。

Based on thermodynamic analysis, BN-MgA1ON composite materials were synthesized by using bo- ron-rich slag and carbon black as main raw materials. Phase composition, microstructure and oxidation proper- ties of products were determined by X-ray diffraction（XRD）, energy spectral analysis, scanning electron mi- croscopy and differential scanning calorimetry（DSC）. The experimental result showed that B203 was trans- formed into BN, A12 03 and SiOe which could react with nitrogen to form MgA1ON phase. BN-MgAION com- posite powders were mainly consisted of MgA1ON, SiMon and BN. BN-MgA1ON composite materials were sin- tered with adding Ye Oa to the composite powders. The main phases of the material were MgA1ON, Sialon, BN and a few of AlsY30,2 and CaYA1307. The oxidation temperature of the materials is around 988℃, and the weight of the samples began to increase rapidly as the temperature keeps rising. The samples can get the maxin- mum weight rate of 5.54% when the temperature is higher than 1320℃.