利用莫来石陶瓷与AlSi_(12)合金制备相变储热材料的研究
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摘要
以莫来石陶瓷和AlSi_(12)合金为原料,合成一种新型的相变储热材料。分析服役期间相变储热材料的物理化学性质,及其相组成、显微结构的变化规律,并探讨AlSi_(12)合金的氧化损坏对相变储热材料储热性能的影响。分析结果表明:经莫来石陶瓷封装的AlSi_(12)合金具有优良的抗氧化性,持续服役1 000 h后,AlSi_(12)合金的氧化增重率仅为3.75%;服役期间,AlSi_(12)合金中部分Al元素被氧化成Al_2O_3,导致了AlSi_(12)合金的相变温度范围变窄,储热量随之减小,从而影响了AlSi_(12)合金的储热性能;AlSi_(12)合金不会严重腐蚀莫来石陶瓷,也不会向莫来石陶瓷渗透,且部分Al_2O_3积聚在莫来石陶瓷表面,从而降低了AlSi_(12)合金在服役后期的氧化速度。研究结果为利用AlSi_(12)合金制备相变储热材料提供参考。
A new phase change heat storage material was synthesized from mullite ceramics and AlSi_(12) alloy.The physical and chemical properties,phase composition and microstructure evolution of phase change heat storage materials during working were analyzed,and the effect of oxidation damage of AlSi_(12) alloy on the thermal storage properties of phase change heat storage materials was discussed.The results showed that AlSi_(12) alloy encapsulated by mullite ceramics had excellent oxidation resistance,and the oxidation weight gain rate of AlSi_(12) alloy was only 3.75% after working for 1 000 h.During working,part of Al element in AlSi_(12) alloy is oxidized to Al_2O_3,which results in the narrowing of phase transformation temperature range and the decrease in heat storage capacity of AlSi_(12) alloy,thus affecting the thermal storage performance of AlSi_(12) alloy.The alloy would not seriously corrode the mullite ceramics,nor would it penetrate into the mullite ceramics,and part of Al_2O_3 accumulates on the surface of the mullite ceramics,which reduced the oxidation rate of AlSi_(12) alloy in the later working period.The results provides a reference for the preparation of phase change heat storage materials using AlSi_(12) alloy.
A new phase change heat storage material was synthesized from mullite ceramics and AlSi_(12) alloy.The physical and chemical properties,phase composition and microstructure evolution of phase change heat storage materials during working were analyzed,and the effect of oxidation damage of AlSi_(12) alloy on the thermal storage properties of phase change heat storage materials was discussed.The results showed that AlSi_(12) alloy encapsulated by mullite ceramics had excellent oxidation resistance,and the oxidation weight gain rate of AlSi_(12) alloy was only 3.75% after working for 1 000 h.During working,part of Al element in AlSi_(12) alloy is oxidized to Al_2O_3,which results in the narrowing of phase transformation temperature range and the decrease in heat storage capacity of AlSi_(12) alloy,thus affecting the thermal storage performance of AlSi_(12) alloy.The alloy would not seriously corrode the mullite ceramics,nor would it penetrate into the mullite ceramics,and part of Al_2O_3 accumulates on the surface of the mullite ceramics,which reduced the oxidation rate of AlSi_(12) alloy in the later working period.The results provides a reference for the preparation of phase change heat storage materials using AlSi_(12) alloy.
引文
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[7]姜洪殿,董康银,孙仁金,等.中国新能源消费预测及对策研究[J].可再生能源,2016,34(8):1196-1202.
[8]夏明,杨杨校.莫来石/刚玉质耐火材料与碱性沉积物腐蚀反应的试验研究[J].耐火与石灰,2014(4):55-61.
[9]吴彤,黄春宝,曹晓国.含莫来石废料添加对陶瓷性能的影响研究[J].中国陶瓷工业,2017,24(4):24-27.
[10]Ping Hou,姚学祥,张桂香.成分梯度CVD莫来石涂层的结构和高温稳定性[J].国外难熔金属与硬质材料,2003,19(1):33-42.
[11]Lao X,Xu X,Wu J,et al.High-temperature alloy/honeycomb ceramic composite materials for solar thermal storage applications:Preparation and stability evaluation[J].Ceramics International,2016,43(5):4583-4593.
[12]何德芝.PCM/储热陶瓷相容性的研究[D].武汉:武汉理工大学,2016.
[13]Tomiczek B,Kujawa M,Matula G,et al.Aluminium AlSi12alloy matrix composites reinforced by mullite porous preforms[J].Materialwissenschaft Und Werkstofftechnik,2015,46(4-5):368-376.