| 분무열분해법으로 제조한 MgO-Al2O3-SiO2계 화합물분체의 소결성 |
| 박정현, 박찬욱, 조경식 |
| 연세대학교 공과대학 요업공학과 |
| A Study on the Sinterability of MgO-Al2O3-SiO2 System Ceramic Powders Prepared by Spray Pyrolysis Method |
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| ABSTRACT |
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Spinel, mullite, forsterite and cordierite composition powders were synthesized from Mg(NO3)2.6H2O, Al(NO3)3.9H2O and SiCl4-ethanol solution by spray pyrolysis method and the sinterability of these powders were investigated. The bulk density of spinel and mullite specimens sintered at 1,$700^{circ}C$ for 1hr was 3.56g/㎤(99.5% relative density) and 3.16g/㎤(99.7% relative density), respectively. (Green compacts were made from powders prepared at 1,00$0^{circ}C$). The bulk density of forsterite and cordierite specimens sintered at 1,480 and 1,40$0^{circ}C$ for 2hrs were 3.217 and 2.155g/㎤, respectively. (Green compacts were made from powders prepared at 1,00$0^{circ}C$). The constituent compositions of spinel and mullite specimens sintered at 1,$700^{circ}C$ for 1hr were 27.5wt% MgO and 70.5wt% Al2O3, respectively. Vickers microhardness and fracture toughness of spinel sintered at the above condition were 13.7GPa and 2.6MN.m3/2, respectively, and room temperature bending strength, 425MPa, was nearly maintained even at the elevated temperature. In the case ofmullite specimens, those values were 13.5GPa, 2.2MN/m3/2 and 430MPa, respectively. |
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