Investigating thiol-epoxy composites for semiconductor die attach adhesives

2015 ◽  
Vol 1718 ◽  
pp. 27-31
Author(s):  
Andrew Wei ◽  
Radu Reit ◽  
Walter Voit
Keyword(s):  
Shear Strength ◽  
Tensile Testing ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Epoxy Polymer ◽  
Processing Technique ◽  
Adhesion Promoters ◽  
Lap Shear ◽  
Die Attach ◽  
Polymer Adhesive

ABSTRACTIn this study, thiol-epoxy polymer composites are explored as candidates for high-temperature die attach applications. We present a polymer composite processing technique for die attach adhesives with low cure-stress. Lap shear samples of both a polymer adhesive and current industry adhesives were subjected to tensile testing and die shear strength was compared. At 260 °C, the candidate polymer adhesive exhibited a die shear strength of 0.500 MPa in comparison with 1.35 MPa and 0.258 MPa for two control adhesives. While samples showed less variation in properties in die shear strength between room temperature and 260 °C, the absolute die shear strength values were inferior to commercial adhesives at both room and elevated temperatures. We hypothesize that low cure stress networks, such as the thiol-epoxies presented, provide a compelling choice to engineer new die attach adhesives, but realize that further network refining is needed including the addition of adhesion promoters and other additives, a task better suited to industrial research with a focus in properties optimization.

scholarly journals Comparison of Mechanical and Microstructural Properties of as-Cast Al-Cu-Mg-Ag Alloys: Room Temperature vs. High Temperature

Crystals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1330
Author(s):  
Muhammad Farzik Ijaz ◽  
Mahmoud S. Soliman ◽  
Ahmed S. Alasmari ◽  
Adel T. Abbas ◽  
Faraz Hussain Hashmi
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Mechanical Testing ◽  
Tensile Testing ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Microstructural Properties ◽  
Testing Environments ◽  
Mechanical And Microstructural Properties ◽  
Mg Content

Unfolding the structure–property linkages between the mechanical performance and microstructural characteristics could be an attractive pathway to develop new single- and polycrystalline Al-based alloys to achieve ambitious high strength and fuel economy goals. A lot of polycrystalline as-cast Al-Cu-Mg-Ag alloy systems fabricated by conventional casting techniques have been reported to date. However, no one has reported a comparison of mechanical and microstructural properties that simultaneously incorporates the effects of both alloy chemistry and mechanical testing environments for the as-cast Al-Cu-Mg-Ag alloy systems. This preliminary prospective paper presents the examined experimental results of two alloys (denoted Alloy 1 and Alloy 2), with constant Cu content of ~3 wt.%, Cu/Mg ratios of 12.60 and 6.30, and a constant Ag of 0.65 wt.%, and correlates the synergistic comparison of mechanical properties at room and elevated temperatures. According to experimental results, the effect of the precipitation state and the mechanical properties showed strong dependence on the composition and testing environments for peak-aged, heat-treated specimens. In the room-temperature mechanical testing scenario, the higher Cu/Mg ratio alloy with Mg content of 0.23 wt.% (Alloy 1) possessed higher ultimate tensile strength when compared to the low Cu/Mg ratio with Mg content of 0.47 wt.% (Alloy 2). From phase constitution analysis, it is inferred that the increase in strength for Alloy 1 under room-temperature tensile testing is mainly ascribable to the small grain size and fine and uniform distribution of θ precipitates, which provided a barrier to slip by deaccelerating the dislocation movement in the room-temperature environment. Meanwhile, Alloy 2 showed significantly less degradation of mechanical strength under high-temperature tensile testing. Indeed, in most cases, low Cu/Mg ratios had a strong influence on the copious precipitation of thermally stable omega phase, which is known to be a major strengthening phase at elevated temperatures in the Al-Cu-Mg-Ag alloying system. Consequently, it is rationally suggested that in the high-temperature testing scenario, the improvement in mechanical and/or thermal stability in the case of the Alloy 2 specimen was mainly due to its compositional design.

Processing of TiAl–Ti2AlN composites and their compressive properties

1992 ◽  
Vol 7 (4) ◽  
pp. 894-900 ◽  
Author(s):  
H. Mabuchi ◽  
H. Tsuda ◽  
Y. Nakayama ◽  
E. Sukedai
Keyword(s):  
Composite Materials ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
High Strength ◽  
Ceramic Composites ◽  
Processing Technique ◽  
Combustion Reaction ◽  
Compressive Properties ◽  
Gaseous Nitrogen ◽  
The Matrix

Using elemental powders, combustion reaction was carried out to form intermetallic-ceramic composites in the Ti–Al–N system. Ti and Al powders reacted exothermically in gaseous nitrogen and formed a mixture product which had a fine distribution of the Ti2AlN particles in the matrix TiAl with a small amount of Ti3Al. Subsequently, these reacted products were arc-melted to obtain fully dense button ingots. The resulting composites had about 30 vol. % Ti2AlN, and the Ti2AlN particles were ellipsoidal or columnar in shape with sizes of 2–10 μm and appeared to be homogeneously distributed and well bonded to the matrix TiAl. It was found that such composite materials have a high strength at both room and elevated temperatures and some intrinsic compressive ductility at room temperature. Therefore, the processing technique in the present investigation is of interest as a new combustion reaction process to make intermetallic-based composite materials.

SiC Power Device Packaging Technologies for 300 to 350°C Applications

2005 ◽  
Vol 483-485 ◽  
pp. 785-790 ◽  
Author(s):  
R.Wayne Johnson ◽  
John R. Williams
Keyword(s):  
Shear Strength ◽  
Copper Foil ◽  
Elevated Temperatures ◽  
Breakdown Strength ◽  
Gold Wire ◽  
Power Devices ◽  
Silver Surface ◽  
Ongoing Research ◽  
Thick Gold ◽  
Die Attach

The challenges of packaging SiC power devices for high temperatures include high operating temperature, wide thermal cycle range, high currents and high voltages. This paper describes ongoing research to develop suitable materials and processes for packaging SiC power devices. Ohmic and Schottky contacts must be protected from oxidation at elevated temperatures. TaSi2:N2 is an effective oxidation barrier, protecting the contacts when exposed to 350 oC in air. For package substrates, silicon nitride ceramics with a thick brazed copper foil are used. A nickel/thick gold or nickel/thick silver surface finish is plated onto the copper foil; depending on the die attach brazing process. With the nickel/thick gold finish, gold-tin eutectic has demonstrated no degradation in die shear strength after 2000 hours at 350 oC or after 500 hours at 400 oC. Work is currently underway with nickel/thick silver and gold-silicon eutectic die attach. No degradation in shear strength has been observed with this system after 100 hours at 400 oC. Gold wire (250 µm) bonding has been demonstrated on both substrate and SiC metallizations. An initial decrease in strength is observed due to annealing of the gold wire, but shear and pull strengths remain high. Polyimide has been used to increase the dc breakdown strength of a test pattern by a factor of ~3x at 300 oC compared to no passivation. The breakdown strength increased with storage in air at 300 oC through 1000 hours.

Influence of Equal-Channel Angular Pressing on the Superplastic Properties of Commercial Aluminum Alloys

1999 ◽  
Vol 601 ◽  
Author(s):  
Sungwon Lee ◽  
Terence G. Langdon
Keyword(s):  
Aluminum Alloys ◽  
Strain Rate ◽  
Tensile Testing ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
High Strain ◽  
Optimum Temperature ◽  
Angular Pressing ◽  
Superplastic Properties ◽  
Al 2024

AbstractEqual-channel angular (ECA) pressing was used to refine the microstructure in two commercial aluminum alloys, Al-2024 and the Supral-100 Al-2004 alloy. The ECA pressing was conducted at room temperature and at elevated temperatures for both alloys using several different processing routes. Tensile testing was carried out at elevated temperatures on both pressed and unpressed samples of each alloy in order to evaluate the effect of the pressing. This paper describes the influence of the ECA pressing on the subsequent mechanical properties of these two alloys. For both alloys, it is shown that the optimum superplastic conditions are influenced by the ECA pressing, and in practice there tends to be a decrease in the optimum temperature for superplasticity and a corresponding increase in the optimum strain rate. In addition, there was evidence for high strain rate superplasticity (HSR SP) in both alloys after the ECA pressing procedure.

Mechanical Properties and Dislocation Structure of Single Crystal Cdte Deformed in Compression at 300°C

1976 ◽  
Vol 34 ◽  
pp. 592-593
Author(s):  
Ernest L. Hall ◽  
J. B. Vander Sande
Keyword(s):  
Mechanical Properties ◽  
Single Crystal ◽  
Dislocation Structure ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Strain Curve ◽  
Optical Devices ◽  
Semiconductor Compound ◽  
Wide Range ◽  
Sample Orientation

The present paper describes research on the mechanical properties and related dislocation structure of CdTe, a II-VI semiconductor compound with a wide range of uses in electrical and optical devices. At room temperature CdTe exhibits little plasticity and at the same time relatively low strength and hardness. The mechanical behavior of CdTe was examined at elevated temperatures with the goal of understanding plastic flow in this material and eventually improving the room temperature properties. Several samples of single crystal CdTe of identical size and crystallographic orientation were deformed in compression at 300°C to various levels of total strain. A resolved shear stress vs. compressive glide strain curve (Figure la) was derived from the results of the tests and the knowledge of the sample orientation.

Spherulite Structures in a Melt Spun Fe-Ni Austenitic Steel

1985 ◽  
Vol 43 ◽  
pp. 52-53
Author(s):  
G. M. Michal ◽  
T. K. Glasgow ◽  
T. J. Moore
Keyword(s):  
Austenitic Steel ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Large Range ◽  
Amorphous Structure ◽  
Nucleation And Growth ◽  
Ni Alloys ◽  
Melt Spun ◽  
Crystal Fibers ◽  
Rapidly Solidified

Large additions of B to Fe-Ni alloys can lead to the formation of an amorphous structure, if the alloy is rapidly cooled from the liquid state to room temperature. Isothermal aging of such structures at elevated temperatures causes crystallization to occur. Commonly such crystallization pro ceeds by the nucleation and growth of spherulites which are spherical crystalline bodies of radiating crystal fibers. Spherulite features were found in the present study in a rapidly solidified alloy that was fully crysstalline as-cast. This alloy was part of a program to develop an austenitic steel for elevated temperature applications by strengthening it with TiB2. The alloy contained a relatively large percentage of B, not to induce an amorphous structure, but only as a consequence of trying to obtain a large volume fracture of TiB2 in the completely processed alloy. The observation of spherulitic features in this alloy is described herein. Utilization of the large range of useful magnifications obtainable in a modern TEM, when a suitably thinned foil is available, was a key element in this analysis.

RIO TINTO ALLOY 242.2

Alloy Digest ◽  
2020 ◽  
Vol 69 (4) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Shear Strength ◽  
Physical Properties ◽  
Elevated Temperatures ◽  
High Strength ◽  
Casting Alloy ◽  
Permanent Mold ◽  
Rio Tinto ◽  
Permanent Mold Castings ◽  
Río Tinto

Abstract Rio Tinto Alloy 242.2 is a heat-treatable, aluminum-copper-magnesium-nickel casting alloy. It is available in the form of ingots to be remelted for the manufacture of sand and permanent mold castings. Alloy 242.0 is used extensively for applications requiring high strength and hardness at elevated temperatures. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and shear strength as well as fatigue. It also includes information on corrosion resistance as well as casting, machining, and joining. Filing Code: Al-463. Producer or source: Rio Tinto Limited.

FANSTEEL 85 METAL

Alloy Digest ◽  
1981 ◽  
Vol 30 (6) ◽  
Keyword(s):  
High Temperature ◽  
Physical Properties ◽  
Creep Strength ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Base Alloy ◽  
Heat Treating ◽  
Good Combination ◽  
Bend Strength ◽  
Temperature Performance

Abstract FANSTEEL 85 METAL is a columbium-base alloy characterized by good fabricability at room temperature, good weldability and a good combination of creep strength and oxidation resistance at elevated temperatures. Its applications include missile and rocket components and many other high-temperature parts. This datasheet provides information on composition, physical properties, microstructure, hardness, elasticity, tensile properties, and bend strength as well as creep. It also includes information on low and high temperature performance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Cb-7. Producer or source: Fansteel Metallurgical Corporation. Originally published December 1963, revised June 1981.

MST 8Mn

Alloy Digest ◽  
1958 ◽  
Vol 7 (8) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Shear Strength ◽  
High Temperature ◽  
Physical Properties ◽  
Surface Treatment ◽  
Tensile Properties ◽  
Elevated Temperatures ◽  
Heat Treating ◽  
Sheet Alloy ◽  
Temperature Performance

Abstract MST 8Mn is a heat treatable sheet alloy having good formability and recommended for use at moderately elevated temperatures. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive and shear strength as well as creep. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ti-17. Producer or source: Mallory-Sharon Titanium Corporation.

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