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Monday, August 3, 2020 | History

2 edition of Internal friction and high temperature measurements on refractory materials. found in the catalog.

Internal friction and high temperature measurements on refractory materials.

John Michael Pelmore

Internal friction and high temperature measurements on refractory materials.

by John Michael Pelmore

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  • 36 Currently reading

Published by University of Aston in Birmingham. Department of Electrical Engineering in Birmingham .
Written in English


Edition Notes

SeriesPh. D thesis.
ID Numbers
Open LibraryOL20910377M

Describe ‘emissivity’ for a refractory material. Emissivity is the measure of material’s ability to both absorb and radiate heat. Higher emissivity characteristic has benefit of heat transfer efficiency and service life of material. High emissivity coatings are applied at the interior surface of the furnace. Refractory. The term refractory in the boiler industry can refer to either a plastic or a castable-type material. According to withdrawn standard ASTM C, a plastic refractory is divided into 5 basic categories: high-duty fireclay, super-duty fireclay, 60% alumina, 70% alumina, and 80% alumina.

High Temperature Tools & Refractory is your source for refractory and other knifemaking supplies. We specialize in high temperature tools and refractory for forges, kilns, and heat treating applications. We have been serving the needs of industry, small business, and the individual craftsman since 1. Friction Coefficient The coefficient of friction is a measurement of frictional force between two surfaces. It is an index of friction behavior of the material. Film friction coefficient depends on the superficial adhesivity (surface tension and crystallinity), additive (smooth agent, pigment, etc.), and surface polishing.

OVERVIEW. The requirements on equipment and devices for measuring internal friction and elasticity moduli different [1,]. For example, the determination of an independent characteristic, such as the internal scattering of energy, i.e. damping capacity, is carried out with different force effects on .   CCS is measured, according to ASTM C, on typically a 2” cube. Cold crushing strength of a refractory material is an indication of its suitability for use in refractory construction. (It is not a measure of performance at elevated temperature.) CCS measures the mechanical strength at room temperature.


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Internal friction and high temperature measurements on refractory materials by John Michael Pelmore Download PDF EPUB FB2

Internal friction studies at t = 20–°C and high-temperature X-ray phase analysis at t =, and °C were carried out to describe the degradation mechanisms of the strength.

Creep at high temperature: Creep is a time dependent property, which determines the deformation in a given time and at a given temperature by a refractory material under stress. Volume stability, expansion, and shrinkage at high temperatures: The contraction or expansion of the refractories can take place during service Size: 1MB.

This comprehensive reference details the technical, chemical, and mechanical aspects of high-temperature refractory composite materials for step-by-step guidance on the selection of the most appropriate system for specific manufacturing processes.

The book surveys a wide range of lining system geometries and material combinations and covers a broad/5(3). A method was developed for determining the internal friction (attenuation coefficient) in refractory materials at room temperature, based on measuring the width of the resonance curve of forced oscillations.

Information is obtained for the first time on the amplitude-independent attenuation coefficient of basic, aluminosilicate, and dinas refractories produced by : M. Bluvshtein, Z. Zykova, N.

Senyavin, I. Khlebnikova. Harry Dembicki, Jr., in Practical Petroleum Geochemistry for Exploration and Production, Viscosity. Viscosity is the internal friction due to molecular cohesion in fluids which results in resistance to flow.

It is measured in poise (P), kg m −1 s −1, but usually expressed as centipoise (cP), kg m −1 s − a frame of reference, the viscosity of some common materials. This book is a unique collection of experimental data in the field of internal friction, anelastic relaxation, and damping properties of metallic materials.

It reviews virtually all anelastic relaxation phenomena ever published, and also most of the internal friction effects based on other types of dissipation of mechanical (elastic) energy. Some applications require special refractory materials.

Zirconia is used when the material must withstand extremely high temperatures. Silicon carbide and carbon (graphite) are two other refractory materials used in some very severe temperature conditions, but they cannot be used in contact with oxygen, as they will oxidize and burn.

Refractory materials containing cordierite (2MgO2Al 2 O 3 5SiO 2) and mullite (3Al 2 O 3 2SiO 2) are used as support in furnaces, because of their low thermal expansion properties (coefficient of thermal expansion (CTE) ≈3–4 × 10 −6 K −1) which confer them a very good ability to thermal shock ed of two phases presenting very different CTE (–3 × 10 −6 for.

It is seen from Fig. 31 62, 63 The high retaining Young's modulus at high temperature indicates that Zr/Hf-Al(Si)-C ceramics are promising high-temperature structural materials. The friction characteristics (wear rate and friction coefficient) are indicated as a function of temperature in the range from room temperature up to – °C.

Data of x-ray examination and electron microscopy of friction surfaces are cited. The fracture mechanism for contacting surfaces of materials in friction is considered. The impulse excitation technique (IET) is a non-destructive material characterization technique to determine the elastic properties and internal friction of a material of interest.

It measures the resonant frequencies in order to calculate the Young's modulus, shear modulus, Poisson's ratio and internal friction of predefined shapes like rectangular bars, cylindrical rods and disc shaped samples.

The history of high heat manufacturing and refractory technology began with the discovery of fire. Nature provided the first refractories, crucibles of rock where metals were softened and shaped into primi-tive tools. Modern refractories are customized, high-temperature ceramics designed to withstand the destructive and extreme service.

There is an ongoing need for developing high temperature self-lubricating materials to meet the severe conditions of mechanical systems, such as advanced engines which require increasingly high working temperatures (at °C or above) and long life [].However, achieving and maintaining low friction and wear at high temperatures have been very difficult in the past and still are the.

heating a snlal1 cubical furnace Cstructed of each material by means of an electric arc, the comparisons being effected by measuring the energy input and the internal and external temp,era­ tures of the.

furn~ces. As a means of,comp!aring the thermal 'conductivities of refractory materials the measured. h~at-input. Internal friction and high temperature measurements on refractory materials Author: Pelmore, John M.

ISNI: X Awarding Body: University of Aston in Birmingham Current Institution: Aston University Date of Award: Availability of Full Text. 8) Creep at high temperature: Creep is a time dependent property which determines the deformation in a given time and at a given temperature by a material under stress.

Refractory materials must maintain dimensional stability under extreme temperatures (including repeated thermal cycling) and constant corrosion from very hot liquids and gases. Masahiko Shimada, Ken'ichi Matsushita, Shusei Kuratani, Taira Okamoto, Mjtsue Koizumi, Koji Tsukuma, Takaaki Tsukidate, Temperature Dependence of Young's Modulus and Internal Friction in Alumina, Silicon Nitride, and Partially Stabilized Zirconia Ceramics, Journal of the American Ceramic Society, /jtbx, 67, 2, (C.

Refractory has always been an integral part of steam-generating boilers. In the steam-generating industry, refractory materials are used for filling gaps and openings to help keep the fire inside the fire box, for lining ash hoppers (wet and dry) that collect ash and slag, and for the protection of lower furnace wall tubes inside fluidized bed, cyclone-fired, or refuse-derived fired boilers.

The temperature dependence of Young's modulus and internal friction (Q −1)in alumina, silicon nitride, and partially stabilized zirconia (Y‐PSZ) ceramics was change in Q −1 was found for alumina, whereas Q −1 for silicon nitride ceramics increased above °C.

The Q −1 of Y‐PSZ increased markedly with increasing temperature up to a peak at ∼°C. High-temperature resonant frequency and damping analysis (HT-RFDA) test facilities are able to fulfill this task and conduct an in-situ measurement of material elastic properties at high temperatures.

Moreover, in contrast to three-point bending tests, they are of a non-destructive nature. purities to form high-temperature solid solutions or crystalline phases or to prevent the formation of amorphous, glas­ sy phases at grain boundaries, then the high-temperature refractory properties, and thus the upper use temperature, could be increased.

A .The purpose of a refractory material is to withstand the high temperatures required in furnaces, kilns, incinerators, power plants etc without contaminating other materials and to conserve heat in the area where it is needed.

Dense refractories are heavy with low porosity but high mechanical strength. Specific heat – The specific heat is a material and temperature related energy factor and is determined with the help of calorimeters.

The factor indicates the amount of energy (calories) needed to raise the temperature of one gram of material by 1 deg C. Compared to water, the specific heats of refractory materials are very low.