THE BASIC PRINCIPLES OF HIGH TEMPERATURE VACUUM METALLOGRAPHY

1961 ◽  
pp. 3-32
Author(s):  
M.G. LOZINSKII
Keyword(s):  
High Temperature ◽  
Basic Principles

High-temperature borate crystal chemistry

2013 ◽  
Vol 228 (9) ◽  
Author(s):  
Rimma S. Bubnova ◽  
Stanislav K. Filatov
Keyword(s):  
Thermal Expansion ◽  
High Temperature ◽  
Thermal Behavior ◽  
Crystal Chemistry ◽  
Borate Glasses ◽  
X Ray Diffraction ◽  
Basic Principles ◽  
Polymorphic Transitions ◽  
X Ray ◽  
Borate Crystal

AbstractThe paper presents a brief review of the present state of high-temperature borate crystal chemistry. This review summarizes the results of high- and low-temperature single crystal X-ray diffraction studies for more than 10 borate structures and high-temperature powder Xray diffraction data for about 65 borates. Thermal behavior of their crystal structures, thermal expansion, polymorphic transitions and their relationship to borate glasses are presented. These studies allow to formulate the basic principles of high-temperature borate crystal chemistry and to reveal the regularities of thermal behavior of borates. On heating, the BO

scholarly journals Wirelessly Powered High-Temperature Strain Measuring Probe Based on Piezoresistive Nanocrystalline Diamond Layers

2016 ◽  
Vol 23 (3) ◽  
pp. 437-449 ◽  
Author(s):  
Adam Bouřa ◽  
Pavel Kulha ◽  
Miroslav Husák
Keyword(s):  
High Temperature ◽  
Theoretical Calculations ◽  
Practical Aspect ◽  
Strain Sensors ◽  
Basic Principles ◽  
Active Devices ◽  
Wireless Powering ◽  
Measuring Probe ◽  
Nano Crystalline ◽  
Temperature Strain

AbstractA high-temperature piezo-resistive nano-crystalline diamond strain sensor and wireless powering are presented in this paper. High-temperature sensors and electronic devices are required in harsh environments where the use of conventional electronic circuits is impractical or impossible. Piezo-resistive sensors based on nano-crystalline diamond layers were successfully designed, fabricated and tested. The fabricated sensors are able to operate at temperatures of up to 250°C with a reasonable sensitivity. The basic principles and applicability of wireless powering using the near magnetic field are also presented. The system is intended mainly for circuits demanding energy consumption, such as resistive sensors or devices that consist of discrete components. The paper is focused on the practical aspect and implementation of the wireless powering. The presented equations enable to fit the frequency to the optimal range and to maximize the energy and voltage transfer with respect to the coils’ properties, expected load and given geometry. The developed system uses both high-temperature active devices based on CMOS-SOI technology and strain sensors which can be wirelessly powered from a distance of up to several centimetres with the power consumption reaching hundreds of milliwatts at 200°C. The theoretical calculations are based on the general circuit theory and were performed in the software package Maple. The results were simulated in the Spice software and verified on a real sample of the measuring probe.

Application of AHP-FUZZY in Analyzing and Evaluating Occupational Hazards of Rolling Enterprise

2013 ◽  
Vol 634-638 ◽  
pp. 3660-3664 ◽  
Author(s):  
Xiao Ni Yang ◽  
Xu Guang Shang
Keyword(s):  
Risk Factors ◽  
High Temperature ◽  
Comprehensive Evaluation ◽  
Fuzzy Comprehensive Evaluation ◽  
Enterprise Modeling ◽  
Occupational Hazards ◽  
Analytic Hierarchy ◽  
Basic Principles ◽  
Occupational Risk Factors ◽  
Hierarchy Process

In order to evaluate occupational hazards comprehensively in the rolling enterprise to provide an effective reference for their improvement, this paper identifies and analyzes the existing occupational risk factors of the rolling enterprise; modeling the occupational hazards of the fuzzy comprehensive evaluation; then studies the example on the basic principles of F-AHP (Fuzzy-Analytic Hierarchy Process). The noise, toxic gas, high temperature and dust are studied respectively and noise is the worst factor. The investigation indicates that F-AHP can be used in comprehensive evaluation of various hazards instead of evaluation based on the single index so as to ensure the results to be more comprehensive, more objective and more practical.

Marine Boiler Deterioration

1949 ◽  
Vol 160 (1) ◽  
pp. 341-358 ◽  
Author(s):  
I. G. Slater ◽  
N. L. Parr
Keyword(s):  
High Temperature ◽  
Corrosion Fatigue ◽  
High Temperature Oxidation ◽  
High Temperature Creep ◽  
Basic Principles ◽  
Temperature Oxidation ◽  
Operation And Maintenance ◽  
Water Side ◽  
Corrosion Pitting ◽  
Marine Boiler

A survey is made of the several forms of boiler corrosion and deterioration encountered in marine practice. Problems of design, operation and maintenance at sea are discussed in relation to metallurgical and electro-chemical phenomena involved. As regards water-side corrosion, pitting is more frequently encountered; general wastage, corrosion fatigue, strain age embrittlement, and caustic embrittlement are in decreasing order of importance. Other forms of deterioration include high-temperature oxidation, bursts, high-temperature creep, and corrosion on the fire side. Several forms of each of the phenomena are illustrated and basic principles involved are discussed.

scholarly journals Experimental and Numerical Analysis of Steel Frame Structure Exposed to High Temperature

2014 ◽  
Vol 14 (2) ◽  
pp. 64-68 ◽  
Author(s):  
Lenka Lausová ◽  
Pavlina Matečková ◽  
Iveta Skotnicová
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
High Temperature ◽  
Material Properties ◽  
Steel Frame ◽  
Frame Structure ◽  
Ansys Software ◽  
Basic Principles ◽  
Fire Loading ◽  
Steel Frame Structure

Abstract Structures exposed to fire loading, where supports prevent thermal expansions, must be calculated according to the basic principles of mechanics while respecting the effect of rising temperature on the structure and its effect on the value of variable material properties at the time of fire. The paper analyzed and compared results of the experiment aimed to verify the behavior of statically indeterminate steel frame exposed to high temperature and numerical modelling using finite element method in the ANSYS software.

Basic principles for selecting phases for high temperature metal matrix composites: Interfacial considerations

1988 ◽  
Vol 22 (6) ◽  
pp. 907-910 ◽  
Author(s):  
M.E. Fine ◽  
D.L. Bourell ◽  
Z. Eliezer ◽  
C. Persad ◽  
H.L. Marcus
Keyword(s):  
High Temperature ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Matrix Composites ◽  
Basic Principles

Influence of Thermo-Mechanical Processing on the Microstructure of Beryllia Dispersed Nickel Alloys

1973 ◽  
Vol 31 ◽  
pp. 184-185
Author(s):  
M.S. Grewal ◽  
S.A. Sastri ◽  
N.J. Grant
Keyword(s):  
High Temperature ◽  
Nickel Alloys ◽  
Thermomechanical Processing ◽  
Cold Work ◽  
High Temperature Strength ◽  
Strengthening Effect ◽  
Mechanical Processing ◽  
Uniform Dispersion ◽  
Oxide Particles ◽  
Nickel Base

Currently there is a great interest in developing nickel base alloys with fine and uniform dispersion of stable oxide particles, for high temperature applications. It is well known that the high temperature strength and stability of an oxide dispersed alloy can be greatly improved by appropriate thermomechanical processing, but the mechanism of this strengthening effect is not well understood. This investigation was undertaken to study the dislocation substructures formed in beryllia dispersed nickel alloys as a function of cold work both with and without intermediate anneals. Two alloys, one Ni-lv/oBeo and other Ni-4.5Mo-30Co-2v/oBeo were investigated. The influence of the substructures produced by Thermo-Mechanical Processing (TMP) on the high temperature creep properties of these alloys was also evaluated.

Application of TEM to Deformation, Wear, and Fracture of Ceramics

1974 ◽  
Vol 32 ◽  
pp. 472-473
Author(s):  
B. J. Hockey
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Mechanical Behavior ◽  
Brittle Materials ◽  
High Temperature Strength ◽  
Wide Range ◽  
Corrosive Environments ◽  
Further Development

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

Lattice Imaging of Grain Boundaries in Ceramics

1977 ◽  
Vol 35 ◽  
pp. 114-115
Author(s):  
D. R. Clarke ◽  
G. Thomas
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Silicon Nitride ◽  
Grain Boundaries ◽  
High Temperature Strength ◽  
Current Interest ◽  
Lattice Imaging ◽  
Special Significance ◽  
Structural Applications ◽  
Refractory Ceramics

Grain boundaries have long held a special significance to ceramicists. In part, this has been because it has been impossible until now to actually observe the boundaries themselves. Just as important, however, is the fact that the grain boundaries and their environs have a determing influence on both the mechanisms by which powder compaction occurs during fabrication, and on the overall mechanical properties of the material. One area where the grain boundary plays a particularly important role is in the high temperature strength of hot-pressed ceramics. This is a subject of current interest as extensive efforts are being made to develop ceramics, such as silicon nitride alloys, for high temperature structural applications. In this presentation we describe how the techniques of lattice fringe imaging have made it possible to study the grain boundaries in a number of refractory ceramics, and illustrate some of the findings.

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