9) H. SCHMCLZRIED: Z. Elektrochem. 66 (l%1) p ) W. D. KINGERY et al.: J. Am. Chem. Soc., 42 (1959), p ) F. HUND: Z. Phys. Chem., 199 (195

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9) H. SCHMCLZRIED: Z. Elektrochem. 66 (l%1) p. 572 10) W. D. KINGERY et al.: J. Am. Chem. Soc., 42 (1959), p.394 11) F. HUND: Z. Phys. Chem., 199 (1952), p. 142 12) J. F. ELLIOTT and M. GLEISER: " Thermochemistry for Steelmaking " Addison- Wesley Publishing Co. (1960) 13) G. L. HUMPHREY, E. G. KING, and K. K. 1) K. KIUKKOLA and C. WAGNER: J. Electrochem. Soc. 104 (1957) 379 KELLOG: Bur. Mines. Rept. Investigations 4870 (1952) 14) L. S. DARKEN and R. W. GURRY: J. Am. Chem. Soc. 67 (1945) p. 1398 5) J. WEISSBURT and R. RUKE: Scientific Instruments, 32 (1960, p. 593 17) J. P. COUGHLIN, E. G. KING, and K. R. BONNICKSON: J. Am. Chem. Soc., 73 (1951) ) C. B. ALCOCK: Physical Chemistry and Technology of the Steelmaking Conference to Commemorate the Career of John Chipman Boston, June (1962) 8) B. C. WEBER: J. Am. Ceram. Soc., 45 (1962), p. 612 15) R. SCHENEK, Th. DINGMANN, P. H. KIRSCHT, and H. WESSELKOCK: Z. anorg. allgen. chem., 182 (1929), p. 97 16) N. A. GOKCEN: J. of Metals, 8(1956), p. 1558 p. 3891 18) W. A. ROTH and F. WEINERT: Arch. EisenhUttenwesen, 7 (1934), p. 460 19) L. S. DARKEN and R. W. GURRY: J. Am. Chem. Soc., 68 (144), p. The Rate of Solution of Sintered SiC by Liquid Iron. Susumu MINOWA and Mineo KOSAKA The rates of solution of the cylindrical sintered silicon carbides by liquid iron that were melted in various furnaces(tammann furnace and two high-frequency furnaces of different cycles) were measured at temperatures from 1400 Ž to 1600 Ž. It was found that the rates of solution of SiC bars in liquid iron were markedly influenced by the concentration of carbon and silicon in the metal and the stirring action of melts. The diffusion process controls the rate of solution of SiC. When the sintered SiC sample was immersed in carbon saturated liquid iron and Fe-C-Si melt (C 1.5%,Si=3.0%),the activation energy of solution was as follows, 49 `86 Kcal/mol in carbon saturated liquid iron, 53 `72 Kcal/mol in Fe-C-Si melt.(received 13 Nov.1963)

Table 1.Chemical composition and other properties of SiC samples. Specific gravity:apparent 2.81, Bulk 2.12g/cm3 Fig.1.Apparatus for solution of SiC in liquid iron.

Fig.2.The relation between dipped time in liquid Fe-C-Si alloy(c=1.5%,si= 3.0%)and decreased diameter of SiC sample. Fig.4.Effect of silicon concentration in liquid iron on the rate of solution of SiC sample. Fig.3.Effect of carbon concentration in liquid iron on the rate of solution of SiC sample. Fig.5.The relation between temperature of carbon saturated liquid iron and rate of solution of SiC sample.

Fig.6.The relation between temperature of Fe-C-Si(C=1.5%,Si=3.0%)alloy and rate of solution of SiC. Fig.7.Model of solution of solid in liquid.

Er is activation energy of solution at various furnace. Fig.8.The relation between logarithm of rate of solution and temperature of carbon saturated liquid iron. Table 2.The ratio of the rate of solution of SiC. Fig.9.The relation between logarithm of rate of solution and temperature of Fe-C-Si (C=1.5%,Si=3.0%)alloy. Table 3.Activation energy for solution (kcal/mole)

Table 4.Composition in equilibrium with graphite and 1ƒÀ-SiC.

2) H. SCHLICHTING: "Boundary Layer Theory" (1255), 2nd 3) T. H. KARMANN: Trans. A. S. M. E, 61 (1939) p. 705 4) M. EISENBERG, etc: Chem. Eng. Prog. Symposium Series, 51 (1955) 10, p.1 7) A. WARD & Jr. TAYLOR: J. Inst. Metals, 86 (1957), p.35 8) C. CRAIGHEAD, etc. : Trans. Met. Soc. Amer. Inst. Min., Met. & Pet. Eng., 203 (1956) p.81 9) J. WERNIK: J. Chem. Phys, 25 (1956), p.47 10) J. M. LOMMEL & B. CHALMERS: Trans. Met. Soc. Amer. Inst. Min., Met. & Pet. Eng., 215 (1959), p.499 12) K. H. BROKMEIER: Electrowarme, 18 (1960) p.13 13) J. B. DARBY & D. B. TI'GLE, etc: Trans. Met. Soc., Amer. Inst. Min., Met. & Pet. Eng., 227 (1963), p.179 14) R. E. GACE & G. DERGY: Trans. Met. Soc. Amer. Inst. Min., Met. & Pet. Eng., 212 (1958), p.331 15) J. CHIPMAN & N. J. GRANT: Trans. Met. Soc. Amer. Inst. Min., Met. & Pet. Eng., 31 (1943), p.365 16) A. I. M. E.: "Basic Open Hearth Steelmaking" (1951), p.646 17) H. SCHENCK, etc: Archiv. Eisenhiittenw., 34 (1963), p.93 18) J. CHIPMAN, & J. C. FULTON, etc: Acta. Metallugica, 2 (1954) p.439 20) C. J. SMITHELLS: "Metals Reference Book" (1949), p.564 21) W. D. KINGERY: "Kineties of High Temperature Process" (1959), p.92

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