材料期刊网

实验原料为电熔镁铝尖晶石、高纯电熔镁砂、登封轻烧铝矾土、Al-Al2O3-MgO混合细粉;少量助烧剂.将原料混练均匀,压制成型放入高温氮化炉烧成,将烧成后试样分为粉料和块状进行抗氧化性实验.测定了试样的氧化增重率、TG-DTA曲线、氧化后试样的表观特征、氧化前后试样的物理性能.试验结果表明:相同工艺条件下制备的MgAlON结合尖晶石复合材料的抗氧化性优于MgAlON结合MgO复合材料的抗氧化性;同种骨料的试样,矾土基MgAlON复合材料试样的抗氧化性优于氧化铝基MgAlON复合材料试样的抗氧化性;MgAlON结合尖晶石复合材料经等温氧化后,其常温力学性能无明显降低.

Experimental material are fused magnesia-alumina spinel, high purity fused magnesite, light burned bauxite in dengfeng and a small amount of sintering aids.Mixed raw materials evenly, pressed into strips, put the samples in the high temperature nitriding furnace.Selected two series of test antioxidation experiment samples, one series were powder samples, the other series were block samples.Measured the oxidation weight gain rate, TG-DTA curves, the apparent characteristics of the oxidized samples and the physical properties of the samples before and after oxidation.The results show that prepared by the same process conditions the oxidation resistance of MgAlON composite spinel composite is better than that of MgAlON combined with MgO composite.With the same aggregate, the oxidation resistance of the composite materials, bauxite based MgAlON composite is better than alumina based MgAlON composite, after isothermal oxidation, the mechanical properties at room temperature of MgAlON composites are not significantly decreased.