The improvement in oxidation resistance of magnesia-carbon refractory bricks by Al4SiC4
Oxidation of carbon is the main problem in magnesia-carbon refractory bricks. Al4SiC4 powder is an excellent antioxidant which has obvious practical significance. It was prepared by vacuum sintering at 1700℃ in vacuum sintering furnace. The effect of Al4SiC4 on the oxidation resistance of magnesia-carbon bricks were investigated at 1500℃. The thickness of decarburized layer of bricks was measured and the oxidized situation of the bricks was examined by XRD, SEM and EDAS. The decarburization layer became thin with adding Al4SiC4 powder. Magnesium alumina spinel (MgAl2O4) was determined to be present by characterization studies on Al4SiC4 added specimens and phase evolution of MgAl2O4 spinel formation were investigated by XRD. The optical microscope and EDAS indicated that the spinel diminished the open pores owing to its volume expansion and formed a protective layer on the surface. The results suggested that the spinel had an excellent effect on the oxidation resistance of bricks. In addition, compared with adding other aluminum-containing antioxidants, the specimens added Al4SiC4 had better stability from high temperature to room temperature.
Al4SiC4 antioxidant magnesia-carbon bricks refractory
Liang LI Shi-feng WANG Shi-bing CHEN
Shandong Institute of Light Industry; Jinan, Shandong, China
国际会议
11th IUMRS International Conference in Asia(第十一届国际材联亚洲材料大会 IUMRS-ICA 2010)
青岛
英文
671-677
2010-09-25（万方平台首次上网日期，不代表论文的发表时间）