Evaluating Heat Resistance of Mold Shells in Investment Casting

Abstract:

The paper describes the theory of developing the heat-resistance criterion for disposable ceramic molds exposed to poured metal, creating a computational and experimental method for computing the heat resistance by rapidly heating the mold by an electric arc, as well as analysis of comparative data on quartz, dinas, and electric-corundum molds from the standpoint of the developed criterial-evaluation theory. In this case, the heat resistance is of one-time character, as this mold sustains only a single casting. Computational and experimental data indicate a low heat resistance of β-quartz, making them non-recommendable for annealing and metal pouring if there is not supporting filler. Molds based on electric-corundum or dinas fillers are free of such drawbacks, with the latter being considerably cheaper. The use of tridymited dinas powders is effective after grinding the spent dinas lining of electric furnaces.

• Periodical: Materials Science Forum (Volume 946)
• Pages: 678-683
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.946.678
• Online since: February 2019
• Authors: B.A. Kulakov, V.K. Dubrovin*, O.M. Zaslavskaya
• Keywords: Casting, Corundum, Dinas, Heat Resistance, Mold Shell, Quartz

References

[1] V.N. Ivanov, Dictionary and Handbook of Foundry Production. Moscow, Mashinostroyenie. (1990).

[2] I.D.m Kashcheyev, K.K. Strelov, P.S. Mamykin, Chemical Technology of Refractories, Moscow: Internet Engineering, (2007).

[3] K.K. Strelov, Theoretical Fundamentals of Refractory Materials Technology, Moscow: Metallurgiya, (1996).

[4] Ya.I. Shklennik, V.A. Ozerov, Investment Casting: a monograph, Мoscow: Mashinostroyeniye, (1984).

[5] R.K. Mysik, S.V. Brusnitsyn, A.V. Sulitsin, S.P. Pavlinich, S.V. Bakerin, B.A. Kulakov, Inestigation of operational characteristics of special-purpose alloy catings, Russian Journal of Non-Ferrous Metals, 58(3) (2017) 231-237.

DOI: 10.3103/s1067821217030142

[6] V.S. Balkevich, Technological Ceramics, Moscow. Stroyzdat, (1984).

[7] Yu.A. Krasulin, Porous Structural Ceramics. – Moscow. Metallurgiya, (1980).

[8] D.P.H. Hasselman, Griffiths Flaaws and the Effect Rarosity on TensileStrength of Brittle Ceramise, J. Amer. Ceram. Soc. 52(8) (1969).

[9] D.P.H. Hasselman, Unified theory of thermal shock fracture initiation and crack propagation in brittle ceramics. J. Amer. Ceram. Soc. 52(11) (1962) 600-604.

DOI: 10.1111/j.1151-2916.1969.tb15848.x

[10] W.D. Kingery, Introduction to Ceramics: Translated from English. Moscow: Stroyizdat, (1967).

[11] W.D. Kingery, Property Measurements at High Temperatures. Moscow: Metallurgizdat, (1963).

[12] L.S. Leibenson, Movement of Natural Fluids in Porous Media. Moscow, Leningrad. Gostekhizdat, (1947).

[13] D.P.H. Hasselman, Griffith criteroin and thermal shock resistant of single-Phase versus multiphase brittle ceramies, J. Amer. Ceram. Soc. 52(5) (1969) 188-289.

DOI: 10.1111/j.1151-2916.1969.tb09188.x

[14] D.P.H. Hasselman, Elastic energy at frakture at surface energy as design criteria for thermal shock. J. Amer. Ceram. Soc. 46(11) (1963) 535–40.

[15] D.P.H. Hasselman, Figures of merit for the thermal stress resistance of high-temperature brittle materials: a rewiew. Ceramurgia International. 4(4) (1978) 147-150.

DOI: 10.1016/0390-5519(78)90028-5

[16] J. Nakayama, Thermal shock resistance of ceramic materials. In: Fracture mechanics of ceramics, plenum press, New Jork - London. 2 (1973) 759-778.

DOI: 10.1007/978-1-4615-7014-1_20

[17] K. Chyng, Fracture energy and thermal shock resistance of mica glass-ceramics. In: Fracture mechanics of ceramics, plenum press / New Jork London. 2 (1973) 495-508.

DOI: 10.1007/978-1-4615-7014-1_4

[18] Chyung Kenneth, Fracture energy and thermal shock resistance of mica glass ceramics. Fracture Mech. Ceram. New York - London. 2 (1974) 495-508.

DOI: 10.1007/978-1-4615-7014-1_4

[19] E. Glenny, M.G. Royston, Transcient thermal stresses promoted by the rapid heating and cooling of brittle circular cylinders. Trans. Brit. Cer. Soc. 10 (1958) 645-677.

[20] V.N. Karnozhitsky, Contact Heat Transfer in Casting: Kyiv: Nauk. Dumka, (1978).