Effect of Vapor-Deposited Parylene Coating on Reliability of Sintered Silver Joints for Extreme Temperature Applications

2016 ◽  
Vol 2016 (1) ◽  
pp. 000338-000344 ◽  
Author(s):  
Zhenzhen Shen ◽  
Aleksey Reiderman
Keyword(s):  
Thermal Stress ◽  
High Temperature ◽  
Mechanical Strength ◽  
Cross Sections ◽  
Mechanical Performance ◽  
Extreme Temperature ◽  
High Humidity ◽  
Test Analysis ◽  
Bonding Method ◽  
Sintered Silver

Abstract Silver nano-particle (AgNP) sintering has been extensively shown to be an excellent bonding method for use in the assembly of high-temperature multi-chip modules (MCM) rated above 200° C. Among the proven advantages of using this material in the assembly are the high mechanical strength of the attachment joints, resilience to thermal cycles, low resistivity, and high thermal conductivity. One of the concerns related to the reliability of sintered silver joints is silver migration. Another concern is the change in the joint's microstructure under thermal stress. Vapor-deposited high-temperature fluorinated parylene coating (Paralyne HT) may have the potential to mitigate those concerns because of its superior conformal and crevice-penetration properties. In this work, impact of Parylene HT on sintered silver joints has been evaluated from the perspective of mechanical strength. Test vehicles were subjected to thermal cycling and high-temperature aging. To understand the sintered silver joint's failure mechanisms, shear test analysis of the cross sections and fracture surfaces was performed. In addition, the effectiveness of Parylene HT as a coating to inhibit silver migration at high humidity was evaluated. Coated and uncoated sintered silver test patterns were stressed with an electrical field inside a high-humidity chamber. The silver migration progression was monitored and compared between coated and uncoated samples during the test. One of the findings was that the coating material penetrates the pores of the sintered silver joints, altering their mechanical performance under thermal stress. Analysis of the performance differences between coated and uncoated test vehicles is presented in the paper.

Study of Thermal Stress in Nano Silver Bonded Silicon Substrates for High Temperature Applications

2019 ◽  
Vol 2019 (HiTen) ◽  
pp. 000052-000055
Author(s):  
G.D. Liu ◽  
C.H. Wang
Keyword(s):  
Thermal Stress ◽  
High Temperature ◽  
Silver Layer ◽  
Silicon Substrates ◽  
The Finite Element Method ◽  
Nano Silver ◽  
Silicon Chips ◽  
Die Attach ◽  
The Relationship ◽  
Sintered Silver

Abstract The silver nanoparticle paste is a promising material for high temperature die-attach applications. In this paper, the finite element method is used to study the relationship between the thickness of the sintered silver layer and the thermal stress in the sintered silver joint. Silicon chips are bonded together with sintered silver layers of different thicknesses. In the experimental study, strain gauges are attached onto the surface of the upper silicon and used to estimate the effects of the nano silver die-attach layer. The results show that the average stress in the silver layer at the interface decreases with the increasing thickness of the silver layer, while the stress on the silicon surface increases with the increasing thickness of the silver layer.

Alloy Joints for High Temperature Electronic Packaging

1998 ◽  
Vol 515 ◽  
Author(s):  
William W. So ◽  
Chin C. Lee
Keyword(s):  
High Temperature ◽  
Melting Temperature ◽  
Cross Sections ◽  
High Vacuum ◽  
Process Temperature ◽  
Development Effort ◽  
Material System ◽  
Constituent Element ◽  
State Diffusion ◽  
Bonding Method

ABSTRACTHigh temperature joints are required for packaging and assembling the emerging high temperature semiconductor devices. A technique of producing high temperature joints at relatively low process temperature is presented. The technique uses liquid-solid interdiffusion to formulate the joint and subsequent solid-state diffusion and interaction to convert the joint material into high temperature alloy. Processes have been developed using the indium-silver binary material system. Joint melting temperature higher than 700°C has been achieved while the process temperature stays below 210°C. In this development effort, the constituent element materials are deposited in multilayer structure in high vacuum to prevent oxidation. As a result, no flux is used and no scrubbing action is applied. The joints produced are examined with a scanning acoustic microscope (SAM) to evaluate the bonding quality. The joint cross-sections are studied using SEM and EDX to find the microstructure and composition. In conventional processes, the process temperature needs to exceed the alloy melting temperature in order to produce a joint. High stresses can develop due to thermal expansion mismatch among materials involved. In the present technique, the relatively low process temperature can significantly reduce the stresses. The multilayer bonding method also facilitates control of the alloy composition and the joint thickness.

DMV 59

Alloy Digest ◽  
2009 ◽  
Vol 58 (8) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Mechanical Strength ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
High Mechanical Strength ◽  
Temperature Performance

Abstract DMV 59 is the material of choice for a wide variety of applications where significant corrosion resistance and high mechanical strength is necessary. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, and joining. Filing Code: Ni-672. Producer or source: Mannesmann DMV Stainless USA Inc.

INCOLOY ALLOY 864

Alloy Digest ◽  
1998 ◽  
Vol 47 (2) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Mechanical Strength ◽  
High Performance ◽  
Exhaust System ◽  
Good Combination ◽  
Fatigue Properties ◽  
Temperature Performance ◽  
Incoloy Alloy ◽  
Oxidation And Corrosion

Abstract Incoloy Alloy 864 is a high performance alloy developed specifically for automotive exhaust system flexible couplings and other exhaust applications. The alloy has a good combination of oxidation and corrosion resistance, with good mechanical strength, stability, and fatigue properties. This datasheet provides information on composition, physical properties, and elasticity. It also includes information on high temperature performance and corrosion resistance as well as joining. Filing Code: SS-708. Producer or source: Inco Alloys International Inc.

scholarly journals Thermal Stress-Based Diffusion Bonding Method: the Case of Oxygen Free Copper to 316L Stainless Steel

2015 ◽  
Vol 56 (10) ◽  
pp. 1683-1687 ◽  
Author(s):  
Takashi Harumoto ◽  
Osamu Ohashi ◽  
Hiroki Tsushima ◽  
Miho Narui ◽  
Kensaku Aihara ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Thermal Stress ◽  
Diffusion Bonding ◽  
316L Stainless Steel ◽  
Bonding Method

scholarly journals Insight into the Mechanical Performance of the UHPC Repaired Cementitious Composite System after Exposure to High Temperatures

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4095
Author(s):  
Qing Chen ◽  
Zhiyuan Zhu ◽  
Rui Ma ◽  
Zhengwu Jiang ◽  
Yao Zhang ◽  
...  
Keyword(s):  
Compressive Strength ◽  
High Temperature ◽  
High Temperatures ◽  
Bonding Strength ◽  
Composite System ◽  
Mechanical Performance ◽  
High Performance Concrete ◽  
Interfacial Structure ◽  
Cementitious Composite ◽  
Average Percentage

In this paper, the mechanical performance of an ultra-high-performance concrete (UHPC) repaired cementitious composite system, including the old matrix and the new reinforcement (UHPC), under various high temperature levels (20 °C, 100 °C, 300 °C, and 500 °C) was studied. In this system, UHPC reinforced with different contents of steel fibers and polypropylene (PP) fibers was utilized. Moreover, the physical, compressive, bonding, and flexural behaviors of the UHPC repaired system after being exposed to different high temperatures were investigated. Meanwhile, X-ray diffraction (XRD), baseline evaluation test (BET), and scanning electron microscope (SEM) tests were conducted to analyze the effect of high temperature on the microstructural changes in a UHPC repaired cementitious composite system. Results indicate that the appearance of the bonded system changed, and its mass decreased slightly. The average percentage of residual mass of the system was 99.5%, 96%, and 94–95% at 100 °C, 300 °C, and 500 °C, respectively. The residual compressive strength, bonding strength, and flexural performance improved first and then deteriorated with the increase of temperature. When the temperature reached 500 °C, the compressive strength, bonding strength, and flexural strength decreased by about 20%, 30%, and 15% for the UHPC bonded system, respectively. Under high temperature, the original components of UHPC decreased and the pore structure deteriorated. The cumulative pore volume at 500 °C could reach more than three times that at room temperature (about 20 °C). The bonding showed obvious deterioration, and the interfacial structure became looser after exposure to high temperature.

scholarly journals Material characterisation of a painted beehive panel by advanced spectroscopic and chromatographic techniques in combination with hyperspectral imaging

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Klara Retko ◽  
Maša Kavčič ◽  
Lea Legan ◽  
Polonca Ropret ◽  
Bojana Rogelj Škafar ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Hyperspectral Imaging ◽  
Cross Sections ◽  
Extreme Temperature ◽  
Transformation Products ◽  
Paint Layer ◽  
Non Invasive ◽  
Painting Technique ◽  
Invasive Techniques ◽  
Conservation Interventions

AbstractIn this study, a painted beehive panel from the collection of the Slovene Ethnographic Museum was examined with respect to its material composition with the aim to reveal the painting technique. Due to the state of degradation due to outdoor weathering (UV irradiation, rainfall, extreme temperature and humidity fluctuations), as well as past conservation interventions, the object represented a complex analytical challenge. We aimed for non-invasive techniques (FTIR in reflection mode, Raman spectroscopy and hyperspectral imaging in the range of 400–2500 nm); however, in order to explore paint layers, cross-sections were also analysed using Raman spectroscopy. FTIR spectroscopy in transmission mode and gas chromatography coupled to mass spectrometry were also used on sample fragments. Various original materials were identified such as pigments and binders. The surface coating applied during conservation interventions was also characterised. Additionally, organic compounds were found (oxalate, carboxylate), representing transformation products. The potential use of Prussian blue as a background paint layer is discussed.

Investigation Into Thermal Stress Characteristics of Pipe-in-Pipe Under High Temperature Condition

2018 ◽  
Author(s):  
Si-Hwa Jeong ◽  
Min-Gu Won ◽  
Nam-Su Huh ◽  
Yun-Jae Kim ◽  
Young-Jin Oh ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Stress ◽  
High Temperature ◽  
Temperature Distribution ◽  
Heat Transfer Analysis ◽  
Piping System ◽  
Curved Pipe ◽  
High Temperature Condition ◽  
Single Pipe ◽  
Radiation Conditions

In this paper, the thermal stress characteristics of the pipe-in-pipe (PIP) system under high temperature condition are analyzed. The PIP is a type of pipe applied in sodium-cooled faster reactor (SFR) and has a different geometry from a single pipe. In particular, under the high temperature condition of the SFR, the high thermal stress is generated due to the temperature gradient occurring between the inner pipe and outer pipe. To investigate the thermal stress characteristics, three cases are considered according to geometry of the support. The fully constrained support and intermediate support are considered for case 1 and 2, respectively. For case 3, both supports are applied to the actual curved pipe. The finite element (FE) analyses are performed in two steps for each case. Firstly, the heat transfer analysis is carried out considering the thermal conduction, convection and radiation conditions. From the heat transfer analysis, the temperature distribution results in the piping system are obtained. Secondly, the structural analysis is performed considering the temperature distribution results and boundary conditions. Finally, the effects of the geometric characteristics on the thermal stress in the PIP system are analyzed.

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