scholarly journals Thermal Fatigue Properties of Ultrasonically Bonded Copper Joints

2019 ◽  
Vol 9 (8) ◽  
pp. 1556 ◽  
Author(s):  
Takahito Fushimi ◽  
Yo Tanaka ◽  
Shinnosuke Soda ◽  
Tomoki Matsuda ◽  
Tomokazu Sano ◽  
...  
Keyword(s):  
Crack Propagation ◽  
Fatigue Resistance ◽  
Thermal Fatigue ◽  
Coefficient Of Thermal Expansion ◽  
Copper Alloys ◽  
Peel Strength ◽  
Fatigue Properties ◽  
Thermal Fatigue Resistance ◽  
Fine Grain ◽  
Copper Material

Thermal fatigue generally occurs in ultrasonically bonded copper joints in electronic devices as the bonding substrate is composed of plural materials, leading to differences in the coefficient of thermal expansion. In this study, we found that the thermal fatigue resistance of the ultrasonically bonded copper joints was influenced by the grain size and hardness of the bonding substrate through the evaluation of the thermal fatigue properties. Copper alloys C1020 and C1940 were used as substrate materials to investigate the influence of the initial properties of the bonding material on the thermal fatigue resistance. We evaluated the crack propagation due to thermal fatigue via thermal cycle tests. Microstructural observations of the region fractured because of thermal fatigue revealed that cracks resulting from thermal fatigue did not progress in the fine grain region formed at the bonded interface. It was inferred that grain boundaries were an obstacle to crack propagation. C1940 has higher hardness and finer grains than C1020, and showed a lower decreasing rate of the peel strength and bonding area after the thermal cycling test than C1020 joints. Thus, a hard copper material with fine grains is effective in suppressing thermal fatigue fracture of ultrasonically bonded copper joints.

THERMO-SPAN ALLOY

Alloy Digest ◽  
1994 ◽  
Vol 43 (2) ◽  
Keyword(s):  
Physical Properties ◽  
Tensile Properties ◽  
Fatigue Resistance ◽  
Thermal Fatigue ◽  
Rupture Strength ◽  
Stress Rupture ◽  
Heat Treating ◽  
Thermal Fatigue Resistance ◽  
Stress Rupture Strength

Abstract THERMO-SPAN ALLOY is a precipitation-hardenable superalloy with a low coefficient of expansion combined with tensile and stress-rupture strength. Thermal fatigue resistance is inherent. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep. It also includes information on forming and heat treating. Filing Code: FE-105. Producer or source: Carpenter.

The Development of High-Alumina Heat Resisting Alloy Used for Scaleboard

2011 ◽  
Vol 287-290 ◽  
pp. 949-952
Author(s):  
Yong Zhe Fan ◽  
Yu Chen Song ◽  
Rui Na Ma
Keyword(s):  
Oxidation Resistance ◽  
Fatigue Resistance ◽  
Thermal Fatigue ◽  
Abrasion Resistance ◽  
High Alumina ◽  
Thermal Fatigue Resistance ◽  
Dry Quenching

According to the requirement of the pot scaleboard of Coke Dry Quenching, high content of aluminium heat resisting alloy was developed.Through changing the content of carbon,boron and titanium,the best compounding of the heat resisting alloy was Fe-8Al-1B-5Cr-0.3C-0.5Ti.The microstructure of this kind of alloy was observed and analyzed with optical microscope.It also had good performance of oxidation resistance,abrasion resistance and thermal fatigue resistance,it was suitable for using as pot scaleboard of CDQ.

The Microstructure and Properties of Coating from Mo2FeB2 Cermet on Surface of H13 Steel by Reactive Flame Spraying

2010 ◽  
Vol 97-101 ◽  
pp. 1321-1327 ◽  
Author(s):  
Xiao Ping Zhou ◽  
Xin Bin Hu ◽  
Yi Sheng Xu
Keyword(s):  
Wear Resistance ◽  
Fatigue Resistance ◽  
Thermal Fatigue ◽  
Ceramic Coating ◽  
Flame Spraying ◽  
H13 Steel ◽  
Thermal Fatigue Resistance ◽  
Microstructure And Properties ◽  
Cermet Coating ◽  
Ternary Boride

The microstructure and properties of ternary boride ceramic coating prepared by reactive flame spraying on surface of H13 steel are studied as well as the microstructures, microhardness, wear resistance and thermal fatigue resistance of the coating. The results show that the Mo2FeB2 cermet coating by reactive flame spraying has good wear resistance and thermal fatigue resistance and its microhardness can even reach 1200 HV.

A New Method to Study the Thermal Fatigue Resistance of Molybdenum by High Power Laser Irradiation

2012 ◽  
Vol 184-185 ◽  
pp. 1384-1388 ◽  
Author(s):  
Shuai Lu ◽  
Hong Wei Li ◽  
Dun Bo Yu ◽  
Ming Pang ◽  
Bo Wang
Keyword(s):  
Fatigue Resistance ◽  
Thermal Fatigue ◽  
High Power ◽  
Laser Heating ◽  
Fatigue Cracks ◽  
Crack Density ◽  
Scale Production ◽  
High Power Laser ◽  
Power Laser ◽  
Thermal Fatigue Resistance

In single roll rapid quenching molding, especially for the preparation of amorphous ribbons and rare earth permanent magnetic materials, the chilling roll is an extremely important component of the preparation equipment. However, frequent repair of the roll is not conducive to continuous large-scale production because of its poor thermal fatigue resistance. Molybdenum is gradually being used as chilling roll material in some applications, and in the present paper a new approach to study the thermal fatigue resistance of molybdenum is based on laser pulse irradiation on the molybdenum surface. A new designed device effectively prevents the molybdenum to be oxidized during the laser heating test. The experiments of thermal fatigue damage on molybdenum were conducted by the high power laser. The results shows that the fatigue cracks had been propagated in the irradiated region after the specimen was loaded by 200 times pulsed laser heating. There is a greater crack density in the laser heating brim region than in the center of the irradiated region. According to the transgranular mode of crack propagation in the laser heating brim region and intergranular mode in the center of the irradiated region, the maximum stress took place at the intersection region due to the great temperature gradient in the laser heating brim region. Continued basis-oriented experiments are planned, regarding the mechanism of thermal fatigue crack initiation and propagation for chilling roll materials.

Failure prediction of the thermal fatigue resistance of a glass

1976 ◽  
Vol 11 (3) ◽  
pp. 458-464 ◽  
Author(s):  
D. P. H. Hasselman ◽  
R. Badaliance ◽  
K. R. McKinney ◽  
C. H. Kim
Keyword(s):  
Fatigue Resistance ◽  
Thermal Fatigue ◽  
Failure Prediction ◽  
Thermal Fatigue Resistance

Preparation and Thermal Fatigue Behaviors of Silicon Nitride Nano-Ceramics

2015 ◽  
Vol 1095 ◽  
pp. 48-52
Author(s):  
Chun Yan Tian ◽  
Hai Jiang
Keyword(s):  
Mechanical Properties ◽  
Silicon Nitride ◽  
Thermal Fatigue ◽  
Fatigue Properties ◽  
Hot Press ◽  
Thermal Fatigue Resistance ◽  
Amorphous Si ◽  
Hot Press Sintering ◽  
Spherical Grains ◽  
Sintered Materials

Silicon nitride nanoceramics were prepared by hot press sintering amorphous Si3N4and α-Si3N4nanopowders. The microstructures as well as the effect of starting powders size on the mechanical properties and thermal fatigue properties were investigated. The results show that microstructure of sintered materials consists of spherical grains with approximate size of 100 nm. The mechanical properties and thermal fatigue resistance vary with the addition of α–Si3N4powders. The maximum flexural strength and fracture toughness are obtained when the α–Si3N4powders amount is 40wt.%. And the Si3N4nanoceramic added 40wt.% α–Si3N4powders has the best capability to suppress crack propagation and the highest critical temperature difference.

Freeze and Thaw and Thermal Fatigue Resistance of LMM Incorporating CNT

2017 ◽  
Author(s):  
Ahmed Abdel-Mohti ◽  
Nathan Craft ◽  
Michael J. Rider ◽  
Jed Marquart ◽  
David Sawyers ◽  
...  
Keyword(s):  
Fatigue Resistance ◽  
Thermal Fatigue ◽  
Thermal Fatigue Resistance ◽  
Freeze And Thaw
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