Related Resources: Heat Transfer

Thermal Conductivity of Refractory Materials

Heat Transfer Engineering
Thermodynamics

Thermal Conductivity of Refractory Materials
108 Pages
Pustovalov, V.V.

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Preface

The study of thermal conductivity of refractory materials continues to remain important even today. This is so, because, generally speaking, the investigations carried out so far applied only to particular cases and were marked by limitation of techniques and by the small number of systematic determinations.

On the other hand, the present state of science and technology the study of thermal conductivity in USSR and planned development of national economy have struck out special fields of thermal conductivity of refractory materials as a result of the introduction of new materials and the development of industries like thermal insulation, metallurgy, chemical industry, aviation, atomic industry and rocketry. Nowadays, it is practically indispensable to determine the thermal conductivity: (a) of a large variety of refractory materials; (b) of very highly refractory materials such as oxides, zirconates, nitrides and carbides, in a wide range of temperatures (2773-3273 K), right up to the melting point; (c) of refractory materials in vacuum (better than lO-%-~m- HgCol) and under high pressures, in protective, regenerative, and oxidizing media, which correspond to the actual operating conditions of many refractories; (d) of refractory materials in the form of powders, ready made materials and special ceramics.

The problems enumerated above form the basis of thermal physics, and involve the study of heat transfer during physicochemical processes in structural materials at high temperatures.

Thermal conductivity is one of the most important physical characteristics of refractory materials. on the thermal conductivity of such materials was so meager that many theoretical aspects of Solid State Physics could not be verified. This can be ascribed to the insufficient study of thermal conductivity of refractory materials and to the imperfections in the experimental techniques. Moreover, the laws governing the variation of thermal conductivity as well as the methods of manufacturing refractory materials with given thermo-physical characteristics were not known.

The investigations carried out. essentially related to particular cases. the subject, compact, accurate and universally useful measuring apparatus were lacking.

In spite of the large number of published works on Modern science and technology of refractories has still to solve the problems of methodology pertaining to the determination of thermal conductivity and the problems of systematic measurement of thermal conductivity, which are necessary for heat engineering calculations and for solving technological problems of science and technology of refractories.

TOC

  • INTRODUCTION
  • METHODS OF MEASURING THERMAL CONDUCTIVITY OF REFRACTORY MATERIALS LAWS GOVERNING THERMAL CONDUCTIVITY VARIATIONS IN REFRACTORY MATERIALS
  • FACTORS AFFECTING HEAT TRANSFER THROUGH
  • CERAMICS

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