論文共10頁 英翻中
Effect of the fuel type on the synthesis of yttria stabilizedzirconia by combustion method
Nano-sized 8 mol% yttria stabilized zirconia (YSZ) powders were synthesized by the combustion method using two different fuels (urea andglycine). The effect of the nature and amount of the fuel was investigated on the phase structure, particle size and microstructure of the resultedYSZ ceramics. The results showed that YSZ powders synthesized using urea presented larger crystallite size and lower specific surface area thanthose derived from glycine route. This behavior is closely related to the combustion flame temperature. The elevated temperature duringcombustion synthesis with urea favored the formation of large aggregates, instead of loose and porous particles as observed for glycine route. As aconsequence, the best result in terms of densification was obtained for the pellets prepared by sintering of powders synthesized through glycineroute.
本文采用燃燒法以兩種不同的有機(jī)燃料（尿素和甘氨酸）成功合成了8 mol% 氧化釔穩(wěn)定氧化鋯納米粉體(YSZ)。通過研究燃料性質(zhì)和數(shù)量對(duì)相結(jié)構(gòu)、顆粒大小及YSZ燒結(jié)體的微結(jié)構(gòu)影響。結(jié)果表明，用尿素合成的YSZ粉體比用甘氨酸合成的粉體晶粒更大，比表面積更小。該現(xiàn)象的產(chǎn)生與燃燒的火焰溫度有密切關(guān)系，當(dāng)用尿素作為燃料時(shí)，其燃燒火焰溫度很高，合成的粉體團(tuán)聚較嚴(yán)重；而甘氨酸作為燃料合成的粉體比較疏松且比表面積較大。因此，將甘氨酸制備的粉體燒結(jié)成球團(tuán)是陶瓷致密化最佳的方法。