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http://dx.doi.org/10.3740/MRSK.2007.17.1.018

Synthesis of PSZ-seeding Mullite Composite from Metal Alkoxides and Its Characteristics of Sintered Body  

Yim, Going (Dept. of Nanopolym. Mat. Eng., Col. of Eng., Paichai University)
Yim, Chai-Suk (Hyosung Corp. R&D.B. Labs, Cent. Res. Inst.)
Kim, Young-Ho (Doowon C&C Co., Tech. R&D Center)
Publication Information
Korean Journal of Materials Research / v.17, no.1, 2007 , pp. 18-24 More about this Journal
Abstract
Mullite-PSZ composite was prepared by sol-gel method using $Al(sec-OC_4H_9)_3,\;Si(OC_2H_5)_4,\;ZrOCl_2\;8H_2O\;and\;Y_2O_3$. The sinterability ana mechanical properties of powder compacts sintered at $1,650^{\circ}C$ for 4 hrs were investigated for various PSZ contents. In result Al-Si spinel formed at $980^{\circ}C$ from amorphous dried gel, and zirconia as well as mullite crystal formed above $1,200^{\circ}C$. The sintered body was densified to $97{\sim}98%$ except the specimen containing 25vol% PSZ which showed the relative density of about 95% obtained by sintering at $1,650^{\circ}C$ for 4 h. The flexural strength of the sintered body was a maximum value of 290 MPa in 20 vol% PSZ, which was also considerably larger than the value of 200 MPa without PSZ. The value of the fracture toughness increased linearly with increase of PSZ content and showed a maximum value of $4.3MPam^{1/2}$ in 25 vol% PSZ, Namely this value was remarkably larger than the $value(2.6MPam^{1/2})$ of pure mullite without PSZ.
Keywords
PSZ-seeding mullite composite; Metal Alkoxides; Sol-gel method; Flexural strength; Fracture toughness;
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