现代技术陶瓷
現代技術陶瓷
현대기술도자
ADVANCED CERAMICS
2014年
1期
15-19
,共5页
莫来石%微孔%热处理制度
莫來石%微孔%熱處理製度
막래석%미공%열처리제도
Mullite%Micropore%Heating schedule
研制具有优良隔热性能的耐火骨料对开发高性能轻质浇注料有重要作用。以 w（α-Al2 O3）＝95％，w （β-Al2 O3）＝3％～5％的工业氧化铝A或w （γ-Al2 O3）＝70％～80％，w （α-Al2 O3）＝5％～10％，w （三水铝石）＝5％～10％的工业氧化铝B ，硅石粉为主要原料，采用烧烬可燃物法制备了微孔轻质莫来石骨料，研究了两种具有不同特性的工业氧化铝和不同热处理制度对合成微孔轻质莫来石骨料性能的影响。结果表明：（1）以工业氧化铝B为原料制得的轻质莫来石骨料的体积密度要普遍低于以工业氧化铝A为原料的，且以工业氧化铝B为原料得到的莫来石骨料的常温耐压强度随热处理温度升高而增加。（2）以不同工业氧化铝为原料合成骨料的莫来石的转化率在1500℃之前大致相当，均为60％（w ）左右，得到的微孔轻质莫来石骨料的平均孔径约为3～5μm。（3）以γ相为主的工业氧化铝B更适合作原料，合适的热处理制度为1350℃6 h。
研製具有優良隔熱性能的耐火骨料對開髮高性能輕質澆註料有重要作用。以 w（α-Al2 O3）＝95％，w （β-Al2 O3）＝3％～5％的工業氧化鋁A或w （γ-Al2 O3）＝70％～80％，w （α-Al2 O3）＝5％～10％，w （三水鋁石）＝5％～10％的工業氧化鋁B ，硅石粉為主要原料，採用燒燼可燃物法製備瞭微孔輕質莫來石骨料，研究瞭兩種具有不同特性的工業氧化鋁和不同熱處理製度對閤成微孔輕質莫來石骨料性能的影響。結果錶明：（1）以工業氧化鋁B為原料製得的輕質莫來石骨料的體積密度要普遍低于以工業氧化鋁A為原料的，且以工業氧化鋁B為原料得到的莫來石骨料的常溫耐壓彊度隨熱處理溫度升高而增加。（2）以不同工業氧化鋁為原料閤成骨料的莫來石的轉化率在1500℃之前大緻相噹，均為60％（w ）左右，得到的微孔輕質莫來石骨料的平均孔徑約為3～5μm。（3）以γ相為主的工業氧化鋁B更適閤作原料，閤適的熱處理製度為1350℃6 h。
연제구유우량격열성능적내화골료대개발고성능경질요주료유중요작용。이 w（α-Al2 O3）＝95％，w （β-Al2 O3）＝3％～5％적공업양화려A혹w （γ-Al2 O3）＝70％～80％，w （α-Al2 O3）＝5％～10％，w （삼수려석）＝5％～10％적공업양화려B ，규석분위주요원료，채용소신가연물법제비료미공경질막래석골료，연구료량충구유불동특성적공업양화려화불동열처리제도대합성미공경질막래석골료성능적영향。결과표명：（1）이공업양화려B위원료제득적경질막래석골료적체적밀도요보편저우이공업양화려A위원료적，차이공업양화려B위원료득도적막래석골료적상온내압강도수열처리온도승고이증가。（2）이불동공업양화려위원료합성골료적막래석적전화솔재1500℃지전대치상당，균위60％（w ）좌우，득도적미공경질막래석골료적평균공경약위3～5μm。（3）이γ상위주적공업양화려B경괄합작원료，합괄적열처리제도위1350℃6 h。
Reducing heat lose of industrial furnaces is an important aspect of energy saving .Using light weight refractories is an effective way for insulating purpose .Development and application of high performance light weight refractory castables is meaningful to energy saving ,for which develo-ping high duty insulating refractory aggregate materials is very necessary .This work prepared light weight micropored mullite aggregate with pore sizes in microns ,by using industrial alumina A ,indus-trial B and natural silica as starting materials and anthracite coal as burning -out material ,wet co -grinding ,then naturally sedimentating and drying to become green body and finally firing at suitable high temperature .Factors affecting properties of the synthesized mullite aggregate were investigated , including heating schedule and the phase composition of industrial alumina .XRD analysis showed that more than95% of α phase for alumina A ,w hile γ -phase range from 70% ~ 80% for alumina B . Phase composition of industrial alumina as a starting material has significant influnence on properties , that with γ-Al2 O3 as the main phase has higher reactivity ,facilitating mullite convertion ,and hence leading to lower BD and higher porosity of the aggregate .Determination on pore size distribution by means of mercury porosimetry analysis revealed that the pore sizes center around a range of 3~5 μm and are uniformly distributed .Properties of the prepared insulating mullite aggregate maintain stable up to 1500℃ .On the other hand ,the mullite ratio is controlled at 60% around .industrial alumina B mainly for γ-Al2 O3 is more suitable as starting material .an appropriate firing temperature for such synthesized light weight mullite aggregate material is 1350℃ × 6h .
