"The Problem. Corrosion of refractories by molten corrosive liquids like molten slags and glasses is of general occurrence in those parts of the furnaces where they come in contact with the liquids. The life of a furnace generally depends upon the progressive rate of corrosion of the refractories by the slags and glasses. There have been various methods used by the investigators to ascertain the useful life of a refractory product before its use in the furnaces, but the problem is so complex that even after decades of research work by the research engineers and technologists a satisfactory and easy test which may not be only of very long duration but also which should not be very costly and complex in set-up has not so far been accepted as standard. Simulative tests have been proposed, modified and finally given up for the lack of quite reliable information obtained from them. What factors make this problem so complex and difficult of solution are discussed in detail in the next section.
The purpose of this study has been to investigate and suggest some method, or a combination of tests, which may be tried by the research engineers to satisfactorily predict, and determine the rate of progressive corrosion of refractories by slags and glasses to be met with by a refractory under actual working conditions. With that end in view a very important segment of the fireclay refractories used in the Ceramic industry was selected. Flux-blocks used in the side-walls and bottom of the glass tank furnaces have been experimented upon in this investigation, and tests have been made to determine and correlate, wherever possible, their relative resistance to corrosion by a very corrosive type of glass with the information made available by the manufacturer. Although the erosion of the refractory by the movement of a glass has not been taken into consideration, and the glass used in the tests has been quite small in amount, yet it Is reasonable to assume that the rate of corrosion in the first few hours of a test may be representative of the rate of corrosion under conditions where a large quantity of glass is continually moving past a refractory.
As mentioned before, the problem offers an unlimited scope of work which ought to be done to develop new techniques for the testing of refractory materials against slags and glasses in the liquid state, and, therefore, herein only an attempt has been made to try and suggest quite a new approach for the determination of slag, or glass attack, on refractories in general and clay flux-blocks in particular. Also, some modified tests are presented, which should be quite helpful in the estimation of the corrosion-resistant properties of a refractory, an attempt has also been made to explore the possibilities of adaptation of an electrochemical method to the problem, which, however, has not been promising due to apparently inexplicable observations reported in this investigation"--Chapter I, pages 1-2.
Herold, P. G.
Materials Science and Engineering
Ph. D. in Ceramic Engineering
Edward Orton Jr. Ceramic Foundation
Missouri School of Mines and Metallurgy
xiii, 203 pages
© 1952 Ved Prakash Maheshwary, All rights reserved.
Dissertation - Open Access
Firebrick -- Testing
Corrosion and anti-corrosives
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Electronic OCLC #
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Maheshwary, Ved Prakash, "Determination of progressive corrosion of clay flux blocks" (1952). Doctoral Dissertations. 990.