Please wait a minute...
Acta Metall Sin  1957, Vol. 2 Issue (1): 107-116    DOI:
Current Issue | Archive | Adv Search |
A STUDY OF "FREEZING" OF THE PYROMETRIC CONES
CHEN HSEN-KU Institute of Metal Research; Academia Sinica
Cite this article: 

CHEN HSEN-KU Institute of Metal Research; Academia Sinica. A STUDY OF "FREEZING" OF THE PYROMETRIC CONES. Acta Metall Sin, 1957, 2(1): 107-116.

Download:  PDF(3522KB) 
Export:  BibTeX | EndNote (RIS)      
Abstract  The phenomenon that a pyrometric cone does not bend over at its own soften-ing temperature is called "freezing". Such phenomenon has been studied for thecones of middle temperature range (SK7-16, or ПК123-146). It is shown that the freezing of a pyrometric cone is due to the formationof certain refractory crystals from molten phases in the cone when the furnacetemperature is either unsteady or kept for a rather long period just balow its sof-tening point. In the cones SK7-10, the refractory crystals formed are of chry-santhemum shape and found petrographically to be isometric cristobalite In thecones SK11-16, apart from crystals found in SK7-10, many needle-like crystalsare formed, X-ray examination shows that they are possibly mullite. If the sodium oxide content is high relative to total alkali in cone materialSK7-10, or potassium oxide is high in SK11-16, may cause the cones to freeze.Thus in order to prepare a series of non-freezing cones the potash felspar shouldbe used as raw material for SK7-10, and soda felspar for SK11-16. It wasattempted to reduce their freezing tendency by substitution CaO by MgO intro-duced as magnesite, but the result was very unsatisfactory.
Received:  18 January 1957     
Service
E-mail this article
Add to citation manager
E-mail Alert
RSS
Articles by authors

URL: 

https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1957/V2/I1/107

[1] Henderson, H. B., Trans. Amer. Ceram. Soc., 11, 619--620 (1909) .
[2] Orton, E. Jr. & Krehbiel, J. F., J. Amer. Ceram. Soc., 11 (4) , 215--223 (1928) .
[3] Henderson, H. B. & Caldwell, J. H., ibid., 11 (11) , 795--802 (1928) .
[4] Rea, R. & Shaw M. C., ibid., 19, 192 (1936) .
[5] Smith, P L., ibid., 22 (6) , 189 (1939) .
[6] Anon, Refract. J. 21, 422 (1945) ; 22, 8 (1946) .
[7] 75. 2 (1950) .
[8] 409 (1952) .
[9] Searle, A. B. An Encyclopaedia of the Ceram. Ind., Vol. 3, 110--112 (1930) .
[10] 林肯:东北科学通讯 第二卷,第六期,515--517(12) (1951) .
[11] 156 (1953) .
[12] McCaughey, W. J. & Neff, J. M., Bull. Amer. Ceram. Soc., 23, 373 (1944) .
[13] 242 (1947) .
[14] Fairchild, C. O. & Peters, M. F., J. Amer. Ceram. Soc., 9 (11) 701--43 (1926) .
[15] Milne, A. J., J. Soc., Glass Technol., 36, 275--286 (1952) .{
No related articles found!
No Suggested Reading articles found!