Effect of Sintering Temperature on the Physical Properties and Microstructure of In Situ Nitrides Bonded MgAl sub(2) O sub(4)-C Refractories

The in situ nitrides bonded MgAl sub(2) O sub(4)-C refractories were prepared by using high quality fused spinel (MgAl sub(2) O sub(4) sub()> or = 97%), natural flake graphite (C > or = 96%) and silicon powder (Si > or = 98%) as raw materials and the liquid calcium lignosulfonate with a con...

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Published inKey Engineering Materials Vol. 697; pp. 591 - 594
Main Authors Wang, Shao Hua, Deng, Cheng Ji, Zhu, Hong Xi, Yuan, Wen Jie
Format Journal Article
LanguageEnglish
Published 01.07.2016
Subjects
Binders
Bonding
Compressive strength
Nitrides
Physical properties
Silicon
Sintering
Sintering (powder metallurgy)
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Summary:The in situ nitrides bonded MgAl sub(2) O sub(4)-C refractories were prepared by using high quality fused spinel (MgAl sub(2) O sub(4) sub()> or = 97%), natural flake graphite (C > or = 96%) and silicon powder (Si > or = 98%) as raw materials and the liquid calcium lignosulfonate with a concentration of 1.25 g/ml was used as binder (4 wt%). The effect of sintering temperatures on physical properties and phase compositions were investigated. The results show that [beta]-sialon and [alpha]-Si sub(3) N sub(4) sub() were formed in the samples sintered at 1400[degrees]C, 1450[degrees]C and 1500[degrees]C, and AlON and AlN were formed in the samples sintered at 1550[degrees]C. The sample that sintered at 1450[degrees]C exhibits the best bulk density and apparent porosity of 2.84 g/cm super(3) and 14.73%, respectively, and the highest compressive strength
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ISBN:9783035710656
3035710651
ISSN:1013-9826
1662-9795
DOI:10.4028/www.scientific.net/KEM.697.591