Liquid-phase sintering from the high-temperature corrosion process standpoint

2001 ◽  
Vol 67 (1-3) ◽  
pp. 32-36 ◽  
Author(s):  
Eugene Medvedovski
Keyword(s):  
High Temperature ◽  
Liquid Phase ◽  
High Temperature Corrosion ◽  
Liquid Phase Sintering ◽  
Corrosion Process

Microstructure of Transient Liquid Phase Sintering Joint by Sn-Coated Cu Particles for High Temperature Packaging

2015 ◽  
Vol 2015 (1) ◽  
pp. 000449-000452 ◽  
Author(s):  
Xiangdong Liu ◽  
Hiroshi Nishikawa
Keyword(s):  
Shear Strength ◽  
High Temperature ◽  
Liquid Phase ◽  
Applied Pressure ◽  
Transient Liquid Phase ◽  
Liquid Phase Sintering ◽  
Thermally Stable ◽  
Bonding System ◽  
Cu Substrates ◽  
Transient Liquid Phase Sintering

We develop a transient liquid phase sinter (TLPS) bonding using Sn-coated Cu micro-sized particles. With this bonding process, a thermally stable joint comprising Cu3Sn phase and a dispersion of ductile Cu particles can be obtained. The particle paste, which contained Cu particles with a thin Sn coating and terpineol, was used to join Cu substrates. The setup was bonded at 300 °C for 30s under an applied pressure of 10 MPa using a thermo-compression bonding system under a formic acid gas atmosphere for reducing the oxide layer on the Sn coating and the Cu substrate. After bonding, the TLPS joint showed a thermally stable microstructure with a good shear strength, which was fully consisted of Cu3Sn intermetallic compounds matrix and embedded ductile Cu particles. The kinetics of the microstructure transformation and high temperature reliability of the TLPS joint were investigated. After 300 °C isothermal aging for 200h, the shear strength and microstructure of the TLPS joints showed almost unchanged. The results demonstrate that joint with high-melting-point obtained by the TLPS bonding using Sn-coated Cu particle paste has the potential to fulfill the requirement of high temperature electronic packaging.

Features of the structure of a high-temperature-strength nickel alloy after liquid-phase sintering

1990 ◽  
Vol 32 (8) ◽  
pp. 618-623
Author(s):  
A. P. Gulyaev ◽  
L. P. Sergienko ◽  
A. V. Logunov ◽  
O. I. Samoilov
Keyword(s):  
High Temperature ◽  
Liquid Phase ◽  
Nickel Alloy ◽  
Liquid Phase Sintering ◽  
High Temperature Strength

High-Temperature Corrosion of Copper Induced by TeO2

CORROSION ◽  
10.5006/3295 ◽  
2020 ◽  
Vol 76 (2) ◽  
pp. 210-216
Author(s):  
Anton Klimashin
Keyword(s):  
High Temperature ◽  
Phase Distribution ◽  
Copper Ion ◽  
High Temperature Corrosion ◽  
Corrosion Layer ◽  
Corrosion Process ◽  
Ion Conductivity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Oxide Melt

It was found that copper is susceptible to the accelerated high-temperature corrosion induced by TeO2 at 650°C in air, which occurs at a constant rate. The calculated corrosion rate constant is 4.5 × 10−4 kg·m−2·s−1 and does not depend on the specific mass of tellurium oxide. Based on the results of the analysis of the microstructure (scanning electron microscopy/energy dispersive x-ray spectroscopy) and the phase composition (x-ray diffraction) of two formed corrosion layers, the phase distribution in the corrosion product has been ascertained. It was shown that during the corrosion process at 650°С, the inner corrosion layer containing Cu2O and Cu2Te and the outer corrosion layer mainly containing CuTe2O5 and Cu2O were formed. The inner layer provides a high copper ion conductivity due to Cu2Te, while the outer layer possesses a high oxygen ion conductivity due to the oxide melt. The mechanism of the overall corrosion process has been proposed.

Pressure Assisted WC-15%wt Co Sintering

2005 ◽  
Vol 498-499 ◽  
pp. 231-237
Author(s):  
M.F. Rodrigues ◽  
Guerold Sergueevitch Bobrovinitchii ◽  
Alan Monteiro Ramalho ◽  
Marcello Filgueira
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Liquid Phase ◽  
Structural Evolution ◽  
Liquid Phase Sintering ◽  
New Method ◽  
Powder Technology ◽  
High Pressure High Temperature

Hardmetal is usually processed by the conventional powder technology techniques: mix of WC + Co powders compacted and liquid phase sintering. A new method to process hardmetal parts is hereby described. Parts of WC-15%wt Co were processed by using high pressure – high temperature sintering. It was used the pressure of 5GPa, temperatures of 780-1200-1350-1400oC, and times of 2-4 minutes of sintering. Results are shown as a function of micro-structural evolution, densification, and hardness measurements.

High Temperature Corrosion of Superheater Materials in Chlorination-Oxidation Atmosphere

2013 ◽  
Vol 718-720 ◽  
pp. 52-58
Author(s):  
Sheng Huan Sang ◽  
Yu Feng Duan ◽  
Hui Chao Chen ◽  
Chang Sui Zhao
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Unit Area ◽  
Mass Gain ◽  
High Temperature Corrosion ◽  
Corrosion Process ◽  
Waste Plastic ◽  
Corrosion Tests

Corrosion experiments were carried out with metals 20G, 15CrMoG and 12Cr1MoVG under the simulated atmosphere (N2-5%O2-1500μL/L HCl) of superheaters in waste plastic boilers to choose appropriate materials preventing high temperature corrosion. Corrosion dynamic curves were plotted by mass gain per unit area. Metal specimens after corrosion tests were analyzed by SEM-EDS and XRD. The results show that 20G has the poorest anti-corrosion abilities among the three materials; the corrosion process is involved in activation oxidation of chlorine. Addition of Cr in alloys can improve their corrosion resistance in the mixed atmosphere.

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