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晶化制度对Mg_(0.6)Al_(1.2)Si_(1.8)O_(6)透明微晶玻璃结构与性能的影响
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作者 包镇红 罗薇 +1 位作者 苗立锋 江伟辉 《材料导报》 EI CAS CSCD 北大核心 2024年第13期68-73,共6页
MgO-Al_(2)O_(3)-SiO_(2)(MAS)系统微晶玻璃具有较高的机械强度、较低的介电损耗以及良好的化学稳定性和热稳定性等优点,在电子、军事、建筑等领域表现出极大的应用价值。采用熔融法,通过控制Mg_(0.6)Al_(1.2)Si_(1.8)O_(6)固溶体晶相... MgO-Al_(2)O_(3)-SiO_(2)(MAS)系统微晶玻璃具有较高的机械强度、较低的介电损耗以及良好的化学稳定性和热稳定性等优点,在电子、军事、建筑等领域表现出极大的应用价值。采用熔融法,通过控制Mg_(0.6)Al_(1.2)Si_(1.8)O_(6)固溶体晶相的析出以制备MAS透明微晶玻璃。采用XRD、SEM和UV-Vis-NIR等测试手段研究了晶化制度对微晶玻璃结构和性能的影响。结果表明:晶化温度从950℃升高到1020℃,试样中析出Mg_(0.6)Al_(1.2)Si_(1.8)O_(6),微晶玻璃透明;当晶化温度为1050℃及更高温度时,试样中析出堇青石,微晶玻璃失透。随晶化温度的升高,玻璃发生Mg_(0.6)Al_(1.2)Si_(1.8)O_(6)向堇青石的晶相转变。与堇青石相比,Mg_(0.6)Al_(1.2)Si_(1.8)O_(6)晶相折射率更接近玻璃相折射率。晶化时间由2 h延长至10 h,微晶玻璃的晶相含量由42.9%(质量分数)提高至97.5%;晶化4~10 h的微晶玻璃中晶粒平均尺寸由17.50μm增大至30.58μm。随着晶化时间的延长,微晶玻璃透光率呈现缓慢下降的趋势,热膨胀系数缓慢增加,维氏硬度呈现先增大后平缓的趋势,抗折强度先增加后减小。微晶玻璃最佳晶化制度为晶化温度1020℃,晶化时间8 h。最佳晶化制度下的微晶玻璃具有较好的综合性能,其可见光区的透光率为83%,热膨胀系数为3.857×10^(-6)/℃(600℃),维氏硬度为10.2 GPa,抗折强度为200 MPa。 展开更多
关键词 mg_(0.6)Al_(1.2)Si_(1.8)O_(6)固溶体 晶化温度 晶化时间 透明微晶玻璃
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Improvement of the conversion efficiency of Mg_(3)Sb_(2)thermoelectric devices through optimizing the resistivity of the MgSbNi barrier layer
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作者 Huimin Zhang Yachao Wang +3 位作者 Zuhair A.Munir Yongzhong Zhang Wenhao Fan Shaoping Chen 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2024年第1期208-214,共7页
Mg_(3)Sb_(2)-based thermoelectric materials have been the focus of widespread investigations as promising candidates for the harvesting of waste heat.Interface stability and service performance are key points for the ... Mg_(3)Sb_(2)-based thermoelectric materials have been the focus of widespread investigations as promising candidates for the harvesting of waste heat.Interface stability and service performance are key points for the commercial applications of these materials.We utilized Mg_(4.3)Sb_(3)Ni as a barrier layer to improve the thermal stability of Mg 3 Sb 2-based devices.However,its intrinsic high resistivity contributed nega-tively to the desired performance of the device.In this work,we investigated two other Mg-Sb-Ni ternary phases,MgSbNi and MgSbNi_(2),as new barrier layer materials to connect with Mg_(3.2)Sb_(2)Y_(0.05).The results show that the efficiency of the Mg_(1.2)SbNi/Mg_(3.2)Sb_(2)Y_(0.05)/Mg_(1.2)SbNi joint is increased by 33%relative to the higher Mg-content barriers due to lower resistivity.The system exhibited good interfacial compatibility and showed little change with aging at 673 K for 20 days. 展开更多
关键词 mg_(3)Sb_(2) mg_(1.2)sbni Barrier layer Conversion efficiency
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