Investigation of Thermal Expansion of a Glass–Ceramic Material with an Extra-Low Thermal Linear Expansion Coefficient

2008 ◽  
Vol 29 (5) ◽  
pp. 1896-1905 ◽  
Author(s):  
T. A. Kompan ◽  
A. S. Korenev ◽  
A. Ya. Lukin
Keyword(s):  
Thermal Expansion ◽  
Ceramic Material ◽  
Expansion Coefficient ◽  
Glass Ceramic ◽  
Linear Expansion ◽  
Glass Ceramic Material ◽  
Linear Expansion Coefficient ◽  
Thermal Linear Expansion ◽  
Thermal Linear Expansion Coefficient

THE THERMAL EXPANSION OF CUBIC BARIUM TITANATE (BaTiO3) FROM 350 °C TO 1050 °C

1959 ◽  
Vol 37 (4) ◽  
pp. 417-421 ◽  
Author(s):  
J. A. Bland
Keyword(s):  
Thermal Expansion ◽  
Barium Titanate ◽  
Systematic Error ◽  
Expansion Coefficient ◽  
Lattice Spacing ◽  
Linear Expansion ◽  
Linear Expansion Coefficient ◽  
X Ray ◽  
Linear Fashion

The lattice spacing of cubic barium titanate (BaTiO3) has been measured as a function of temperature by means of a Unicam X-ray camera. The relation between a0 (in Å) and t between 350 °C and 1050 °C is:[Formula: see text]The maximum systematic error in a0 is 0.0005 Å. The linear expansion coefficient varies in an approximately linear fashion between 10.8 × 10−6 per °C at 350 °C to 17.5 × 10−6 = per °C at 1050 °C.

scholarly journals MEASUREMENT OF THE THERMAL EXPANSION COEFFICIENT OF AN Al-Mg ALLOY AT ULTRA-LOW TEMPERATURES

2013 ◽  
Vol 27 (22) ◽  
pp. 1350119
Author(s):  
M. BASSAN ◽  
B. BUONOMO ◽  
G. CAVALLARI ◽  
E. COCCIA ◽  
S. D'ANTONIO ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Expansion Coefficient ◽  
Normal State ◽  
Low Temperatures ◽  
Linear Expansion ◽  
Longitudinal Mode ◽  
Mg Alloy ◽  
Linear Expansion Coefficient ◽  
Independent Measurement ◽  
Mode Excitation

We describe a result coming from an experiment based on an Al - Mg alloy (~5% Mg ) suspended bar hit by an electron beam and operated above and below the temperature of transition from superconducting to normal state of the material. The amplitude of the bar first longitudinal mode of oscillation, excited by the beam interacting with the bulk, and the energy deposited by the beam in the bar are the quantities measured by the experiment. These quantities, inserted in the equations describing the mechanism of the mode excitation and complemented by an independent measurement of the specific heat, allow us to determine the linear expansion coefficient α of the material. We obtain α = [(10.9±0.4)T+(1.3±0.1)T3]×10-10 K -1 for the normal state of conduction in the temperature interval 0.9 < T < 2 K and α = [(-2.45±0.60)+(-10.68±1.24)T +(0.13±0.01)T3]×10-9 K -1 for the superconducting state in the interval 0.3 < T< 0.8 K .

scholarly journals Specific Heat and Thermal Expansion Coefficient of Hybrid Epoxy Composites

2020 ◽  
Vol 57 (3) ◽  
pp. 61-69
Author(s):  
Georgel Mihu ◽  
Vasile Bria ◽  
Adrian Circiumaru ◽  
Iulian Gabriel Birsan ◽  
Marina Bunea
Keyword(s):  
Thermal Expansion ◽  
Carbon Black ◽  
Specific Heat ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Hybrid Composites ◽  
Epoxy Composites ◽  
Linear Expansion Coefficient ◽  
Thermal Linear Expansion Coefficient ◽  
Ply Orientation

Thermal behavior of hybrid epoxy composites reinforced with different types of plain weave fabrics and ply orientation at various angles was investigated in this research. It was analyzed their thermal linear expansion coefficient and specific heat measured with Thermomechanical Analyzer (TMA) and Differential Scanning Calorimeter (DSC) respectively. Also, in this paper was studied the influence of carbon black - aramid powder and carbon black - barium ferrite mixtures added into epoxy matrix between certain plies of the hybrid composites. The experimental results showed that the addition of filler mixtures led to a significant decreasing of thermal expansion coefficient and specific heat of the hybrid epoxy composite with carbon outer plies. It was recorded a good structural stability in case of hybrid carbon-glass composite in the temperature range of 40-60�C.

Influence of Crushed Basalt Aggregate on Crack Resistance of Concrete

2012 ◽  
Vol 253-255 ◽  
pp. 529-532
Author(s):  
Jian Jun Yan ◽  
Shi Hua Zhou ◽  
Shang Shi Peng
Keyword(s):  
Crack Resistance ◽  
Temperature Stress ◽  
Expansion Coefficient ◽  
Linear Expansion ◽  
Drying Shrinkage ◽  
Temperature Deformation ◽  
Linear Expansion Coefficient ◽  
Volume Deformation

The crack resistance of concrete with crushed basalt aggregate was studied. Compared with the limestone concrete, the basalt concrete has larger drying shrinkage and autogenous volume deformation. The linear expansion coefficient of basalt concrete is 1.3×10－6 /°C larger than that of limestone concrete, and it has additional temperature deformation of 24.1×10－6. According to the analysis on temperature-stress of concrete, the cracking temperature of basalt concrete is 8.9°C higher than that of limestone concrete, and the crack resistance of basalt concrete is unfavorable.

scholarly journals Technological Forecasting of Deformations in Flat Parts

2020 ◽  
Vol 3 (1) ◽  
pp. 1-12
Author(s):  
Tatiana N. Ivanova ◽  
Witold Biały ◽  
Jiři Fries ◽  
Victor Nordin
Keyword(s):  
Expansion Coefficient ◽  
Linear Expansion ◽  
Plate Thickness ◽  
Heat Removal ◽  
Quality Parameters ◽  
Grinding Wheel ◽  
Linear Expansion Coefficient ◽  
Plate Material ◽  
Thermal Deformations ◽  
Geometric Size

AbstractThe deformation of a part occurring in the process of grinding directly influences its exploitation and quality parameters. The instability of shape and size, which occurs due to an imbalance of residual stress, can be the one of the major causes of deformation of a part. The decrease in stress slows down the deformation process. Considering the regularities of heat source intensity dependence on the grinding modes, it can be asserted that with increasing grinding depth and grinding wheel hardness, the value increases and it decreases with a growth in a speed of the part and the use of cooling. The higher the heat removal is and the better lubricant properties of the liquid are, the more significant the decrease in is. Changing these values allows regulation of the residual stresses. As a result of the research on determination of deformations, it is recommended to reduce thermal deformations by considering the geometric size of a plate to be machined, linear expansion coefficient of plate material and an allowance for nonflatness from thermal deformations. The value of nonflatness from thermal deformations is directly proportional to linear expansion coefficient of plate material and its square overall dimensions. At the same time, the value of nonflatness is inversely proportional to the plate thickness.

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