为降低耐火材料对大气的污染，保护环境，以天然锆英石、中低品位铝矾土和 SiC 粉为主要原料，首先将锆英石和中低品位铝矾土按质量比为91配料在 N2气氛中于1600℃保温3 h 碳热还原氮化合成 ZrN－SiAlON粉体；然后选用蔗糖为环保型碳质结合剂，以60％（w）的 SiC 粉和40％（w）的 ZrN－SiAlON 粉体，经150℃烘干后制备了 ZrN－SiAlON－SiC 复相耐火材料，并研究了蔗糖外加量（外加质量分数分别为4％、8％、12％和16％）对复相材料经150℃烘干和1500℃热处理后材料性能的影响。结果表明：当蔗糖外加量为12％（w）时，经过150℃烘干后的 ZrN－SiAlON－SiC 复相耐火材料的显气孔率最小（17．6％），体积密度最大（2．48 g·cm －3），抗折强度最大（22．2 MPa）；经1500℃热处理后，蔗糖结构被破坏，粘结性降低，导致耐火材料显气孔率变大，体积密度减小，抗折强度降低。
To reduce the pollution of refractories and protect the environment,ZrN-SiAlON powder was syn-thesized by carbothermal reduction nitridation with natural zircon,medium-and low-grade bauxite and SiC powder as the main starting materials (zircon bauxite =9 1,by mass)at 1 600 ℃ for 3 h in N2 atmos-phere.Then ZrN -SiAlON -SiC composite refractories were prepared with 60 mass% SiC powder and 40 mass% ZrN-SiAlON powder drying at 150 ℃ adding sucrose as carbon bonding agent.The influence of sucrose additions (extra adding 4%,8%,12%,and 16%,by mass)on the properties of the ZrN-SiAlON-SiC refractories drying at 150 ℃ or firing at 1 500 ℃ was researched.The results show that the apparent po-rosity,bulk density,modulus of rupture of prepared ZrN-SiAlON-SiC refractories reach the optimal value, 17.6%,2.48 g·cm -3 ,and 22.2 MPa,respectively after drying at 150 ℃ when the sucrose addition is 12 mass%. After the heat treatment at 1 500 ℃,the specimen has increased apparent porosity,decreased bulk density,and reduced modulus of rupture owing to the destroy of the sucrose structure and the declined bonding.
参考文献
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