GLYCINE NITRATE COMBUSTION SYNTHESIS OF OXIDE CERAMIC POWDERS
GLYCINE NITRATE COMBUSTION SYNTHESIS OF OXIDE CERAMIC POWDERS
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DOI：
10.1016/0167-577x(90)90003-5
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发表时间：
1990-09-01
影响因子：
3
通讯作者：
EXARHOS, GJ
中科院分区：
文献类型：
--
作者：
CHICK, LA;PEDERSON, LR;EXARHOS, GJ
采用甘氨酸-硝酸盐燃烧合成法制备了高质量的氧化物陶瓷粉末，包括取代铬铁矿和取代锰酸盐粉末。通过在水溶液中将甘氨酸与金属硝酸盐以其适当的化学计量比组合来制备前体。加热前体以蒸发过量的水，产生粘性液体。进一步加热至约180°C导致前体液体自燃。燃烧迅速且自我维持，火焰温度在1100至1450°C之间。铬铁矿产物组成均匀，比表面积为32 m2/g，而锰氧化物产物由两个不同的相组成，煅烧后的表面积为23 m2/g。当与使用无定形柠檬酸盐方法制备的类似组合物相比时，甘氨酸-硝酸盐-产生的粉末具有更大的组成均匀性、更低的残留碳水平和更小的粒度。
A new combustion synthesis method, the glycine-nitrate process, has been used to prepare oxide ceramic powders, including substituted chromite and manganite powders of high quality. A precursor was prepared by combining glycine with metal nitrates in their appropriate stoichiometric ratios in an aqueous solution. The precursor was heated to evaporate excess water, yielding a viscous liquid. Further heating to about 180°C caused the precursor liquid to autoignite. Combustion was rapid and self-sustaining, with flame temperatures ranging from 1100 to 1450°C. The chromite product was compositionally homogeneous with a specific surface area of 32 m2/g, while the manganite product was composed of two distinct phases with a 23 m2/g surface area after calcination. When compared to similar compositions made using the amorphous citrate process, glycine-nitrate-produced powders had greater compositional uniformity, lower residual carbon levels and smaller particle sizes.