A method of cyclic elastic-plastic torsion testing of refractory materials at normal and high temperatures

1970 ◽  
Vol 2 (12) ◽  
pp. 1266-1271 ◽  
Author(s):  
Yu. V. Miloserdin ◽  
A. A. Kul'bakh ◽  
V. N. Chechko ◽  
B. D. Semenov
Keyword(s):  
High Temperatures ◽  
Refractory Materials ◽  
Torsion Testing ◽  
Elastic Plastic

Large-volume cubic press produces high temperatures above 4000 Kelvin for study of the refractory materials at pressures

2020 ◽  
Vol 91 (1) ◽  
pp. 015118 ◽  
Author(s):  
Xuefeng Zhou ◽  
Dejiang Ma ◽  
Lingfei Wang ◽  
Yusheng Zhao ◽  
Shanmin Wang
Keyword(s):  
High Temperatures ◽  
Large Volume ◽  
Refractory Materials

John Hugh Chesters, O.B.E. 6 October 1906 – 14 December 1994

2000 ◽  
Vol 46 ◽  
pp. 37-48
Author(s):  
G.W. Greenwood
Keyword(s):  
Heat Flow ◽  
Thermal Shock ◽  
High Temperatures ◽  
Refractory Materials ◽  
Steel Melting ◽  
Structure And Properties ◽  
Corrosive Environments ◽  
Efficiency And Reliability

John Hugh Chesters, fulfilling his ambitions as a schoolboy, had a lifelong involvement in the application of science to solve practical and industrially important problems. His major contributions relate mainly to the efficiency and reliability of furnaces for steel melting. These were accomplished through research on refractory materials for furnace linings and on heat flow. His work led to great improvements in the processing and use of ceramics in bulk and in the characterization of the structure and properties of these materials. As a result, the capability of appropriate refractory materials to withstand stresses, sudden thermal shock, and corrosive environments for the long periods at high temperatures that arise in iron and steelmaking processes was substantially increased.

scholarly journals Thermomechanical properties of mullitic materials

2017 ◽  
Vol 11 (4) ◽  
pp. 322-328 ◽  
Author(s):  
Jan Urbánek ◽  
Jiří Hamácek ◽  
Jan Machácek ◽  
Jaroslav Kutzendörfer ◽  
Jana Hubálková
Keyword(s):  
Flexural Strength ◽  
High Temperatures ◽  
Maximum Level ◽  
Ceramic Materials ◽  
Mechanical Tests ◽  
Thermomechanical Properties ◽  
Refractory Materials

Mechanical tests provide important information about the properties and behaviour of materials. Basic tests include the measurement of flexural strength and in case of refractory materials, the measurement of flexural strength at high temperatures as well. The dependence of flexural strength on the temperature of ceramic materials usually exhibits a constant progression up to a certain temperature, where the material starts to melt and so the curve begins to decline. However, it was discovered that ceramic mullitic material with a 63 wt.% of Al2O3 exhibits a relatively significant maximum level of flexural strength at about 1000?C and refractory mullitic material with a 60 wt.% of Al2O3 also exhibits a similar maximum level at about 1100?C. The mentioned maximum is easily reproducible, but it has no connection with the usual changes in structure of material during heating. The maximum was also identified by another measurement, for example from the progression of the dynamic Young?s modulus or from deflection curves. The aim of this work was to analyse and explain the reason for the flexural strength maximum of mullitic materials at high temperatures.

scholarly journals Investigation of the thermal expansion of the refractory materials at high temperatures

2017 ◽  
Vol 891 ◽  
pp. 012317
Author(s):  
A Kostanovskiy ◽  
M Kostanovskaya ◽  
M Zeodinov ◽  
A Pronkin
Keyword(s):  
Thermal Expansion ◽  
High Temperatures ◽  
Refractory Materials

scholarly journals Refractory Materials For High-Temperature Thermoelectric Energy Conversion

1983 ◽  
Vol 24 ◽  
Author(s):  
Charles Wood ◽  
David Emin
Keyword(s):  
Rare Earth ◽  
High Temperature ◽  
Energy Conversion ◽  
Transport Properties ◽  
Refractory Material ◽  
High Temperatures ◽  
Refractory Materials ◽  
Efficient Energy ◽  
Thermoelectric Energy ◽  
Material Systems

ABSTRACTTwo refractory material systems show promise for efficient energy conversion at high temperatures (>1000 K): the rare-earth chalcogenides and the boron-rich borides. The electronic and thermal transport properties of these two systems are compared and discussed.

Elastic-plastic deformation and spall fracture of metals at high temperatures

1998 ◽  
Author(s):  
S. V. Razorenov ◽  
A. A. Bogatch ◽  
G. I. Kanel ◽  
A. V. Utkin ◽  
V. E. Fortov ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
High Temperatures ◽  
Spall Fracture ◽  
Elastic Plastic

scholarly journals Influence of heating to high temperatures on mechanical properties of boride-based refractory materials

2021 ◽  
Vol 2 (1(58)) ◽  
pp. 21-25
Author(s):  
Anastasiia Lokatkina ◽  
Tetiana Prikhna ◽  
Viktor Moshchil ◽  
Pavlo Barvitskyi ◽  
Oleksandra Borimsky ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
High Temperatures ◽  
Mechanical Characteristics ◽  
Aerospace Industry ◽  
Initial Mixture ◽  
Refractory Materials ◽  
Melting Temperatures ◽  
Before And After ◽  
Sintered Materials

The object of research is HfB2, ZrB2 and ceramics composition HfB2-30 % SiC and ZrB2-20 % SiC, ZrB2-20 % SiC-4 % Si3N4 obtained under high pressure, their mechanical characteristics before and after heating to high temperatures and temperatures of beginning of melting. The research was conducted in order to create new effective refractory materials for use in the aerospace industry. Therefore, the melting temperatures of sintered materials and the effect of heating on their mechanical properties were also studied. Additives (ZrB2-20 % SiC and HfB2-30 % SiC) although led to a decrease in specific gravity. But increased hardness (by 17 % and 46 % in the case of ZrB2 and HfB2, respectively) and fracture toughness (by 40 % and 21 % in the case of ZrB2 and HfB2, respectively). However, significantly reduced the onset of melting temperature in vacuum to 2150–2160 °C. Materials sintered from ZrB2 and HfB2 was not melted after heating to 2970 °C. After heating to a melting point of 2150–2160 °C (in the case of materials with additives) and to temperatures of 2970 °C (in the case of materials sintered with ZrB2 or HfB2), the hardness and fracture toughness decreased. Thus, the hardness of the material prepared from ZrB2 decreased by 19 % and its fracture toughness – by 18 %, and of that prepared from ZrB2–20 % SiC – by 46 % and 32 %, respectively. The hardness of the material prepared from HfB2 decreased by 46 %, its fracture toughness – by 55 %, and of that prepared from HfB2-30 % SiC, after heating decreased by 40 %, but its fracture toughness increased by 15 %. The sintered HfB2 (with a density of 10.4 g/cm3) before heating showed a hardness of HV(9.8 N)=21.27±0.84 GPa, HV(49 N)=19.29±1.34 and HV(98 N)=19.17±0.5, and fracture toughness K1C(9.8 N)=0.47 MH·m0.5, and ZrB2 with a density of 6.2 g/cm3 was characterized by HV(9.8 N)=17.66±0.60 GPa, HV(49 N)=15.25±1.22 GPa and HV(98 N)=15.32±0.36 GPa, K1C(9.8 N)=4.3 MH·m0.5. Material sintered with HfB2-30 % SiC (density 6.21 g/cm3) had Hv(9.8 N)=38.1±1.4 GPa, HV(49 N)=27.7±2.8 GPa, and K1C(9.8 N)=8.1 MH·m0.5, K1C(49 H)=6.8 MH·m0.5. The sintered with ZrB2-20 % SiC material had density of 5.04 g/cm3, HV(9.8 N)=24.2±1.9 GPa, HV(49 N)=16.7±2.8 GPa, K1C(49 H)=7.1 MH·m0.5. The SiC addition to the initial mixture significantly reduces the elasticity of the materials.

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