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Study on Properties of Mg-Al Spinel Ceramics Prepared by Casting Sintering Method
Integrated Ferroelectrics ( IF 0.7 ) Pub Date : 2021-07-21 , DOI: 10.1080/10584587.2021.1911250
Liang Li 1
Affiliation  

Abstract

Magnesium alumina spinel (MgAl2O4) is a composite mineral composed of MgO and Al2O3, and its theoretical chemical composition is 28.33 wt% MgO and 71.67 wt% Al2O3, with excellent properties such as high melting point, high hardness, high strength, high resistivity, wide energy band gap, low coefficient of thermal expansion, corrosion resistance and thermal shock. In the process of synthesizing magnesia-alumina spinel ceramics, it is important to select suitable sintering temperature, suitable holding time, suitable kinds of mineralizers and suitable amount of mineralizers in order to improve the strength and toughness of magnesia-alumina spinel ceramics and reduce the water absorption of magnesia-alumina spinel ceramics. In this study, using fused magnesia powder and alumina powder as main raw materials, sodium hexametaphosphate as water reducer, silica powder as binder and titanium dioxide powder as mineralizer, magnesia-alumina spinel ceramics were synthesized by casting and sintering. The effects of sintering temperature and holding time on the properties of magnesia-alumina spinel ceramics were studied. The most suitable sintering temperature is about 1600 °C and the most suitable holding time is about 4 h. Titanium dioxide powder was selected as mineralizer, and the effect of adding titanium dioxide powder on the properties of synthesized magnesia-alumina spinel ceramics was studied. The experimental results show that the addition of titanium dioxide powder can improve the bending strength and reduce the water absorption of the synthesized magnesia-alumina spinel ceramics. When the addition of titanium dioxide powder increased to 7%, the bending strength of magnesia-alumina spinel ceramics increased to 33 MPa, and the water absorption decreased to 2.8%. SEM analysis shows that the addition of titanium dioxide powder can promote the formation of magnesia-alumina spinel phase, refine the grain size of magnesia-alumina spinel and strengthen the microstructure of magnesia-alumina spinel ceramics.



中文翻译:

铸造烧结法制备镁铝尖晶石陶瓷的性能研究

摘要

镁铝尖晶石(MgAl 2 O 4)是一种由MgO和Al 2 O 3组成的复合矿物,其理论化学成分为28.33 wt% MgO和71.67 wt% Al 2 O 3,具有高熔点、高硬度、高强度、高电阻率、能带隙宽、热膨胀系数低、耐腐蚀、抗热震等优良性能。在镁铝尖晶石陶瓷的合成过程中,选择合适的烧结温度、合适的保温时间、合适的矿化剂种类和合适的矿化剂用量,对于提高镁铝尖晶石陶瓷的强度和韧性,降低镁铝尖晶石陶瓷的强度至关重要。镁铝尖晶石陶瓷的吸水率。本研究以电熔镁粉和氧化铝粉为主要原料,六偏磷酸钠为减水剂,二氧化硅粉为结合剂,二氧化钛粉为矿化剂,通过铸造和烧结合成镁铝尖晶石陶瓷。研究了烧结温度和保温时间对镁铝尖晶石陶瓷性能的影响。最合适的烧结温度约为 1600 ℃,最合适的保温时间约为 4 小时。选择钛白粉作为矿化剂,研究了添加钛白粉对合成镁铝尖晶石陶瓷性能的影响。实验结果表明,二氧化钛粉体的加入可以提高合成镁铝尖晶石陶瓷的抗弯强度并降低其吸水率。当二氧化钛粉的添加量增加到7%时,镁铝尖晶石陶瓷的抗弯强度增加到33 MPa,吸水率下降到2.8%。

更新日期:2021-07-22
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