Method of measuring electric conductivity of ceramic materials at high temperatures

Refractories ◽  
1962 ◽  
Vol 3 (5-6) ◽  
pp. 172-175
Author(s):  
P. P. Budnikov ◽  
T. N. Keshishyan ◽  
V. K. Yanovskiy
Keyword(s):  
Electric Conductivity ◽  
High Temperatures ◽  
Ceramic Materials ◽  
Measuring Electric Conductivity

Investigation of the Properties of Alumina-Zirconia Ceramics

2014 ◽  
Vol 1040 ◽  
pp. 245-249
Author(s):  
Aleksander S. Ivashutenko ◽  
Alexandr V. Kabyshev ◽  
Nikita Martyushev ◽  
Igor G. Vidayev
Keyword(s):  
Dielectric Constant ◽  
Electric Conductivity ◽  
High Temperatures ◽  
Electrostatic Field ◽  
Mechanical Characteristics ◽  
Ferroelectric Properties ◽  
Dissipation Factor ◽  
Zirconia Ceramics ◽  
Measurement Results ◽  
Dielectric Dissipation Factor

The article focuses on the investigation of the properties of alumina-zirconia ceramics possessing high mechanical characteristics and good conductivity at high temperatures. Measurement results of the dielectric dissipation factor, dielectric constant, electric conductivity when using direct and alternating current for the ceramics samples of 80%(ZrO2-3%Y2O3)-20% Al2O3 composition are presented in the paper. Measurements were conducted simultaneously in the electrostatic field in vacuum while heating the samples to the temperatures ranging from 300 to 1700K. Investigations showed that alumina-zirconia ceramics at high temperatures obtains ferroelectric properties not typical of these structures.

Fracture behaviour of ceramic materials at high temperatures

Metal Science ◽  
1981 ◽  
Vol 15 (3) ◽  
pp. 130-132 ◽  
Author(s):  
G. Popp ◽  
R. F. Pabst
Keyword(s):  
High Temperatures ◽  
Fracture Behaviour ◽  
Ceramic Materials

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.

Microstructure of Neutron Irradiated β-Si3 N4

1982 ◽  
Vol 40 ◽  
pp. 604-605
Author(s):  
R. A. Youngman
Keyword(s):  
Elevated Temperature ◽  
High Temperatures ◽  
Neutron Irradiation ◽  
Ceramic Materials ◽  
Fusion Reactors ◽  
Structural Components ◽  
Structural Ceramic ◽  
First Wall ◽  
Recent Interest ◽  
Controlled Thermonuclear Fusion

Recent interest in the use of ceramic materials as structural components, particularly the first wall, of proposed controlled thermonuclear fusion reactors has lead to investigation of their response to neutron irradiation at elevated temperature. One such structural ceramic is Si3 N4 which undergoes very little or no swelling after a large neutron dose at high temperatures.

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