O'-sialon-ZrO2 composite based on the cheap commercial available zircon and silicon as raw materials can be achieved by using reac-tion nitridation method,More attention was given to the nitriding process and the ...O'-sialon-ZrO2 composite based on the cheap commercial available zircon and silicon as raw materials can be achieved by using reac-tion nitridation method,More attention was given to the nitriding process and the effect of additives on it .The experimental results show that there are two nitridation paths:one is the direct nitridation of silicon powder and the other is through the reaction between the medi-um compound ZrSi2 and the nitrogen.The effects of addition of calcia and the incorpora-tion of BN on the nitriding reaction were also investigated,the primitive experimental results demonstrated that both of calcia and BN could deteriorate the nitriding degree.展开更多
The present paper describes the synthesis of new com-postie anti-oxidants consisting of Al4SiC4 and aluminum-oxycarbides by heating a mixture of silica ,aluminum and carbonaceous substance at relatively low temperatur...The present paper describes the synthesis of new com-postie anti-oxidants consisting of Al4SiC4 and aluminum-oxycarbides by heating a mixture of silica ,aluminum and carbonaceous substance at relatively low temperatures of 1500℃ in a flowing argon atmosphere.The phase compo-sition of the composite powder could be controlled through adjusting the fraction of raw materials in starting materi-als ,and also through controlling the sythesizing tempera-ture.In addition, the residual amount of Al4C3,Which was an intermediate phase in rection process,could be eliminated as much a5 possible.Therefore ,the hydration of the composite owders can be avoided.The addition of the synthesized composite anti-oxidants into carbon-bearing refractories can improve oxidation resistance greatly just like aluminum does but with non-hydration and breakage after oxidation.展开更多
文摘O'-sialon-ZrO2 composite based on the cheap commercial available zircon and silicon as raw materials can be achieved by using reac-tion nitridation method,More attention was given to the nitriding process and the effect of additives on it .The experimental results show that there are two nitridation paths:one is the direct nitridation of silicon powder and the other is through the reaction between the medi-um compound ZrSi2 and the nitrogen.The effects of addition of calcia and the incorpora-tion of BN on the nitriding reaction were also investigated,the primitive experimental results demonstrated that both of calcia and BN could deteriorate the nitriding degree.
文摘The present paper describes the synthesis of new com-postie anti-oxidants consisting of Al4SiC4 and aluminum-oxycarbides by heating a mixture of silica ,aluminum and carbonaceous substance at relatively low temperatures of 1500℃ in a flowing argon atmosphere.The phase compo-sition of the composite powder could be controlled through adjusting the fraction of raw materials in starting materi-als ,and also through controlling the sythesizing tempera-ture.In addition, the residual amount of Al4C3,Which was an intermediate phase in rection process,could be eliminated as much a5 possible.Therefore ,the hydration of the composite owders can be avoided.The addition of the synthesized composite anti-oxidants into carbon-bearing refractories can improve oxidation resistance greatly just like aluminum does but with non-hydration and breakage after oxidation.
