In this study, raw silica was replaced by the silica pre-calcined at two different temperatures： 1100 ℃ and 1 300℃ to prepare self-flow silica castables. The properties of the synthesized castables adopting differe...In this study, raw silica was replaced by the silica pre-calcined at two different temperatures： 1100 ℃ and 1 300℃ to prepare self-flow silica castables. The properties of the synthesized castables adopting different kinds of silica were compared. The results show that： （1） the silica become loose after pre-calcination at 1 100 ℃ for 5h or at 1300 ℃ for 5 h; metastable cristobalite and glass phase are Jbund in the silica pre-calcined at 1 300 ℃ .for 5 h, which have a promoting effect on sintering ; （ 2 ） with the increase of the pre-calcining temperature as well as the replacement of pre-calcined silica, the linear change rate decreases, the apparent porosity and bulk den.sity change mildly, and flexural strength and com- pressive strength are enhanced;for the refractoriness under load, the increasing pre-calcining temperature has promotion effect but the replacing amount has very mild influence.展开更多
文摘In this study, raw silica was replaced by the silica pre-calcined at two different temperatures： 1100 ℃ and 1 300℃ to prepare self-flow silica castables. The properties of the synthesized castables adopting different kinds of silica were compared. The results show that： （1） the silica become loose after pre-calcination at 1 100 ℃ for 5h or at 1300 ℃ for 5 h; metastable cristobalite and glass phase are Jbund in the silica pre-calcined at 1 300 ℃ .for 5 h, which have a promoting effect on sintering ; （ 2 ） with the increase of the pre-calcining temperature as well as the replacement of pre-calcined silica, the linear change rate decreases, the apparent porosity and bulk den.sity change mildly, and flexural strength and com- pressive strength are enhanced;for the refractoriness under load, the increasing pre-calcining temperature has promotion effect but the replacing amount has very mild influence.
