Influence of Chemical Composition on Phase Transformation Temperature and Thermal Expansion Coefficient of Hot Work Die Steel

2008 ◽  
Vol 15 (6) ◽  
pp. 56-61 ◽  
Author(s):  
Hao-jie Xie ◽  
Xiao-chun Wu ◽  
Yong-an Min
Keyword(s):  
Thermal Expansion ◽  
Phase Transformation ◽  
Chemical Composition ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Transformation Temperature ◽  
Phase Transformation Temperature ◽  
Die Steel ◽  
Hot Work Die

scholarly journals SYNTHESIS OF LEUCITE

2010 ◽  
Vol 13 (3) ◽  
pp. 75-82
Author(s):  
Minh Quang Do ◽  
Minh Ngoc Huynh
Keyword(s):  
Thermal Expansion ◽  
Phase Transformation ◽  
Bulk Density ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Transformation Temperature ◽  
Promising Material ◽  
Phase Transformation Temperature ◽  
Alumino Silicate ◽  
Dental Applications

Leucite, a potassium alumino-silicate (KAlSi2O6), is a very promising material for dental applications. It was initially introduced into dental porcelain compositions to adjust the thermal expansion coefficient of the ceramic to be similar to that of metal [1,2,11,12]. The mineral leucite was synthesized by melting the mixture of KNO3, Al(OH)3 and Cam Ranh sand in the fire of acetylene burner, which can increase the temperature to around 2000 – 2200oC. The obtained material has the following properties: bulk density ρ = 2,48g/cm3, phase transformation temperature at 642,5oC, thermal expansion coefficient in range of 30 to 642,5oC (of tetragonal) is 25,9.10-6.K-1, in range 642,5 to 946,8oC is 9,3.10-6.K-1 (of cubic).

Influence of Cooling Rate and Chemical Composition on Phase Transformation and Hardness of C70S6 Steel

2017 ◽  
Vol 898 ◽  
pp. 1202-1207 ◽  
Author(s):  
Yan Ji ◽  
Ning Bo Zhou ◽  
Xiao Hang Sun ◽  
Bo Jiang ◽  
Lei Lei Xiao ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Chemical Composition ◽  
Cooling Rate ◽  
Transformation Temperature ◽  
Testing Machine ◽  
Transformation Products ◽  
Carbon Equivalent ◽  
Phase Transformation Temperature ◽  
Pearlite Content ◽  
Simulation Testing

The influence of cooling rate and chemical composition on phase transformation and hardness of C70S6 steel were studied by Gleeble-3800 thermal simulation testing machine and box type electric furnace. The results showed that when the cooling rate was between 0.3 and 5 °C/s, the transformation products of two experimental steels were mainly composed of ferrites, pearlite and sorbite. The pearlite content gradually decreased with the cooling rate increasing, while the sorbite content increased and the ferrite content changed little. Both the ferrite and pearlite transformation starting temperature and ending temperature decreased with the cooling rate increasing. Besides, the hardness increased with the cooling rate. At the same cooling rate, the phase transformation temperature increased slightly with the carbon equivalent decreasing, and the pearlite content increased, while the hardness decreased. The hardness of C70S6 steel was reduced by cooling rate decreasing. However, it was difficult to realize the method of decreasing the hardness by adjusting the cooling rate in the case of higher carbon equivalent. Therefore, in order to obtain an appropriate hardness, the Ceq must be controlled. And a Ceq=0.83% was recommended.

Effect of Al2O3 Addition on Microstructure, Thermal Expansion and Mechanical Properties of Ta2O5 Ceramics

2012 ◽  
Vol 512-515 ◽  
pp. 631-634 ◽  
Author(s):  
Jian Er Zhou ◽  
Jing Zhang ◽  
Xiao Zhen Zhang ◽  
Xue Bing Hu
Keyword(s):  
Mechanical Properties ◽  
Thermal Expansion ◽  
Phase Transformation ◽  
Mechanical Strength ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Bending Strength ◽  
Minor Phase ◽  
Α Phase ◽  
Dry Pressing

The Ta2O5-based ceramics were prepared by dry pressing/sintering technique using Ta2O5and Al2O3as the starting materials. The present work investigated the effect of alumina (Al2O3) additions on the composition, microstructure, thermal expansion coefficient (TEC) and bending strength of Ta2O5ceramics. The thermal expansion of the samples was measured by the dilatometry method. It was found that Al2O3additions can effectively inhibit the β to α phase transformation in Ta2O5ceramics. Orthorhombic AlTaO4as the minor phase formed when 2.5 and 7.0 wt% Al2O3was added. The addition of Al2O3results in obvious change of TEC and an increase of bending strength. This work demonstrated that the addition of Al2O3is an effective way to modify the TEC and mechanical strength of Ta2O5ceramics.

Anisotropy properties of the quartzite from Jegłowa, Poland

2013 ◽  
Vol 63 (2) ◽  
pp. 265-269
Author(s):  
Tomasz Marciniszyn ◽  
Adam Sieradzki
Keyword(s):  
Thermal Conductivity ◽  
Thermal Expansion ◽  
Chemical Composition ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Dielectric Spectroscopy ◽  
Thermal Conductivity Coefficient ◽  
Dielectric Measurements ◽  
Thermal Expansion Measurement ◽  
Wide Range

Abstract Marciniszyn, T. and Sieradzki, A. 2013. Anisotropy properties of the quartzite from Jegłowa, Poland. Acta Geologica Polonica, 63 (2), 265-269. Warszawa. Results of the dielectric spectroscopy, thermal and dilatometric measurements of the quartzite rock are presented. Based on the dielectric measurements performed in a wide range of the frequency (101 - 5 ・ 107 Hz) at temperature of 300K the piezoresonance in quartzite was found. A chemical composition of quartzite was examined by XRF. The anisotropy of the thermal conductivity was observed. The thermal conductivity coefficient changes from 13.2 [W/Km] to 5.6 [W/Km] for the [100] and [001] direction, respectively. Based on the thermal expansion measurement the thermal expansion coefficient of quartzite was estimated to be α Q = 8.0 ・ 10-6 [K-1 ] ±0.7 ・ 10-6 .

scholarly journals Out-of-Plane Thermal Expansion Coefficient and Biaxial Young’s Modulus of Sputtered ITO Thin Films

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 153
Author(s):  
Chuen-Lin Tien ◽  
Tsai-Wei Lin
Keyword(s):  
Thin Films ◽  
Thermal Expansion ◽  
Thermal Stress ◽  
Young’S Modulus ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Young's Modulus ◽  
Heating Temperature ◽  
Glass Substrates ◽  
Ito Thin Films

This paper proposes a measuring apparatus and method for simultaneous determination of the thermal expansion coefficient and biaxial Young’s modulus of indium tin oxide (ITO) thin films. ITO thin films simultaneously coated on N-BK7 and S-TIM35 glass substrates were prepared by direct current (DC) magnetron sputtering deposition. The thermo-mechanical parameters of ITO thin films were investigated experimentally. Thermal stress in sputtered ITO films was evaluated by an improved Twyman–Green interferometer associated with wavelet transform at different temperatures. When the heating temperature increased from 30 °C to 100 °C, the tensile thermal stress of ITO thin films increased. The increase in substrate temperature led to the decrease of total residual stress deposited on two glass substrates. A linear relationship between the thermal stress and substrate heating temperature was found. The thermal expansion coefficient and biaxial Young’s modulus of the films were measured by the double substrate method. The results show that the out of plane thermal expansion coefficient and biaxial Young’s modulus of the ITO film were 5.81 × 10−6 °C−1 and 475 GPa.

scholarly journals Alternative of bone china and porcelain as ceramic hand molds for rubber latex glove films formation via dipping process

2020 ◽  
Vol 59 (1) ◽  
pp. 523-537
Author(s):  
Chaturaphat Tharasana ◽  
Aniruj Wongaunjai ◽  
Puwitoo Sornsanee ◽  
Vichasharn Jitprarop ◽  
Nuchnapa Tangboriboon
Keyword(s):  
Thermal Expansion ◽  
Flexural Strength ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Mold Surface ◽  
Rubber Latex ◽  
Latex Glove ◽  
Bone China ◽  
Synthetic Rubber ◽  
Natural And Synthetic

AbstractIn general, the main compositions of porcelain and bone china composed of 54-65%wt silica (SiO2), 23-34% wt alumina (Al2O3) and 0.2-0.7%wt calcium oxide (CaO) suitable for preparation high quality ceramic products such as soft-hard porcelain products for teeth and bones, bioceramics, IC substrate and magneto-optoelectroceramics. The quality of ceramic hand mold is depended on raw material and its properties (pH, ionic strength, solid-liquid surface tension, particle size distribution, specific surface area, porosity, density, microstructure, weight ratio between solid and water, drying time, and firing temperatures). The suitable firing conditions for porcelain and bone china hand-mold preparation were firing at 1270°C for 10 h which resulted in superior working molds for making latex films from natural and synthetic rubber. The obtained fired porcelain hand molds at 1270°C for 10 h provided good chemical durability (10%NaOH, 5%HCl and 10%wtNaCl), low thermal expansion coefficient (5.8570 × 10−6 (°C−1)), good compressive (179.40 MPa) and good flexural strength (86 MPa). While thermal expansion coefficient, compressive and flexural strength of obtained fired bone china hand molds are equal to 6.9230 × 10−6 (°C−1), 128.40 and 73.70 MPa, respectively, good acid-base-salt resistance, a smooth mold surface, and easy hand mold fabrication. Both obtained porcelain and bone china hand molds are a low production cost, making them suitable for natural and synthetic rubber latex glove formation.

Sign in / Sign up

Export Citation Format

Share Document