The production of Al2O3 matrix composites by directed melt oxidation of pure Al externally doped with spinel type dopants has been investigated. The presence of any one of MgAl2O4, LiAlO2, and ZnAl2O4 resulted in oxide growths in a similar fashion to the growths produced using elemental Mg, Li, and Zn. Rapid growth was achieved at 1180°C with MgAl2O4 and at 900°C with LiAlO2. The growth rates at 1180°C of the samples doped with ZnAl2O4 were less rapid than the growth rates of the samples doped with MgAl2O4. The fact that growth is initiated by mixed oxide spinel dopants is further evidence in support of the cyclic reaction sequences that have been proposed for directed melt oxidation.
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References
1.
NEWKIRKM. S., URQUHARTA. W., ZWICKERH. R., and BREVALE.: J. Mater. Res., 1986, 1, 81–89.
2.
NEWKIRKM. S., LESHERH. D., WHITED. R., KENNEDYC. R., URQUHARTA. W., and CLAART. D.: Ceram. Eng. Sci. Proc., 1987, 8, 879–885.
3.
NAGELBERGA. S., ANTOLINS., and URQUHARTA. W.: J. Am. Ceram. Soc., 1992, 75, 455–462.
4.
SINDELM., TRAVITZKYN. A., and CLAUSSENN.: J. Am. Ceram. Soc., 1990, 73, 2615–2618.
5.
LINDSAYG., BAKKERW. T., and DEWINGE. W.: J. Am. Ceram. Soc., 1964, 47, 90–94.
6.
VLACHK. C., SALASO., NIH., JAYARAMV., LEVIC. G., and MEHRABIANR. J.: J. Mater. Res., 1991, 6, 1982–1995.
7.
DEBROYT., BANDHOPADHYAYA., and ROYR.: J. Am. Ceram. Soc., 1994, 77, 1296–1300.
8.
VENUGOPALANH., TANKALAK., and DEBROYT.: Metall. Mater. Trans. B, 1996, 27B, 43–58.
9.
YANGL., ZHUD., and ZHANGJ.: Metall. Mater. Trans. A, 1996, 27A, 2094–2099.
10.
GUX. and HANDR. J.: J. Eur. Ceram. Soc., 1996, 16, 929–935.
11.
SALASO., NIH., JAYARAMV., VLACHK. C., LEVIC. G., and MEHRABIANR.: J. Mater. Res., 1991, 6, 1964–1981.
12.
ANTOLINS., NAGELBERGA. S., and CREBERD. K.: J. Am. Ceram. Soc., 1992, 75, 447–454.
13.
GUX. and HANDR. J.: J. Mater. Sci., 1995, 30, 6005–6012.
14.
HANABEM., JAYARAMV., and BHASKARANT. A.: Acta Mater., 1996, 44, 819–829.
15.
GUX., HANDR. J., and ARGENTB. B.: J. Eur. Ceram. Soc., 1999, 19, 1641-1649.
