Degradation Mechanism of Pressure-Assisted Sintered Silver by Thermal Shock Test

This paper investigates the degradation mechanism of pressure-sintered silver (s-Ag) film for silicon carbide (SiC) chip assembly with a 2-millimeter-thick copper substrate by means of thermal shock test (TST). Two different types of silver paste, nano-sized silver paste (NP) and nano-micron-sized paste (NMP), were used to sinter the silver film at 300 °C under a pressure of 60 MPa. The mean porosity (p) of the NP and MNP s-Ag films was 2.4% and 8%, respectively. The pore shape of the NP s-Ag was almost spherical, whereas the NMP s-Ag had an irregular shape resembling a peanut shell. After performing the TST at temperatures ranging from −40 to 150 °C, the scanning acoustic tomography (SAT) results suggested that delamination occurs from the edge of the assembly, and the delamination of the NMP s-Ag assembly was faster than that of the NM s-Ag assembly. The NMP s-Ag assembly showed a random delamination, indicating that the delamination speed varies from place to place. The difference in fracture mechanism is discussed based on cross-sectional scanning electron microscope (SEM) observation results after TST and plastic strain distribution results estimated by finite element analysis (FEA) considering pore configuration.

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Binding Performance of a Zirconia Framework Material and Veneering Porcelain

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.177.186 ◽

2010 ◽

Vol 177 ◽

pp. 186-189 ◽

Cited By ~ 4

Author(s):

Long Quan Shao ◽

Bin Deng ◽

Yuan Fu Yi ◽

Qi Liu ◽

Wei Wei Zhang ◽

...

Keyword(s):

Bond Strength ◽

Thermal Shock ◽

Shear Bond Strength ◽

Chemical Element ◽

Radial Crack ◽

Visual Observation ◽

Thermal Shock Test ◽

Cross Sectional ◽

Shock Test ◽

Cad Cam

In this study, the binding performance of a Cercon-based zirconia framework material and special Cercon Ceram S zirconia veneering porcelain is discussed. Rectangular 30 mm × 20 mm × 2 mm porcelain blocks were made from zirconia using the CAD/CAM system. The 2 mm veneering porcelain was then sintered onto blocks at a temperature of 850-800°C with a loading speed of l mm/min. The shear bond strength of the interface was tested. Sintering was studied by visual observation, scanning electron microscopy, energy dispersive spectroscopy (EDS), thermal shock test and other methods. Excellent sintering results of the zirconia framework material and veneering porcelain can be achieved. The cross-sectional morphology of the samples, observed by SEM, shows a uniform, fine, and smooth texture for the veneering porcelain, whereas that of the zirconia framework material shows a rough surface with a uniform and compact texture. EDS results indicate that a small amount of A12O3 and SiO2 is present in the zirconia area, and no ZrO2 or Y2O3 is detected in the veneering porcelain area. No interlayer radial crack or flaw is found throughout the entire thermal shock test of the samples at 60-240°C. Thus, the cracking temperature of the samples is pegged at T>240°C. The shear bond strength of the interface is 32.62±5.77 MPa. Chemical element infiltration exists between zirconia and the veneering porcelain, indicating the chemical bond between the two. An excellent match between the Cercon-based zirconia framework and the special veneering porcelain can be achieved, which can satisfy clinical requirements.

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Degradation Behavior of TiN Coatings with Different Thicknesses after a Pulsed Laser Thermal Shock Test

Korean Journal of Metals and Materials ◽

10.3365/kjmm.2013.51.10.729 ◽

2013 ◽

Vol 51 (10) ◽

pp. 729-734 ◽

Cited By ~ 1

Author(s):

Seol Jeon ◽

Youngkue Choi ◽

Hyun-Gyoo Shin ◽

Hyun Park ◽

Heesoo Lee ◽

...

Keyword(s):

Thermal Shock ◽

Pulsed Laser ◽

Thermal Shock Test ◽

Degradation Behavior ◽

Shock Test ◽

Tin Coatings

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Analysis of the electrical characteristics and structure of Cu-Filled TSV with thermal shock test

Electronic Materials Letters ◽

10.1007/s13391-013-3260-6 ◽

2014 ◽

Vol 10 (3) ◽

pp. 649-653 ◽

Cited By ~ 6

Author(s):

Il Ho Jeong ◽

Myong Hoon Roh ◽

Flora Jung ◽

Wan Ho Song ◽

Michael Mayer ◽

...

Keyword(s):

Thermal Shock ◽

Thermal Shock Test ◽

Electrical Characteristics ◽

Shock Test

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Thermal shock test specimen

10.2172/4223035 ◽

1966 ◽

Author(s):

A.G. Eggers

Keyword(s):

Thermal Shock ◽

Test Specimen ◽

Thermal Shock Test ◽

Shock Test

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Critical analysis and innovation propositions to the heat and thermal shock test method of the Brazilian Standard NBR 15575 (2013)

Revista ALCONPAT ◽

10.21041/ra.v10i3.390 ◽

2020 ◽

Vol 10 (3) ◽

pp. 364-376

Author(s):

Luciani Somensi Lorenzi ◽

Kassio J. Stein ◽

Luiz Carlos Pinto da Silva Filho

Keyword(s):

Thermal Shock ◽

Construction Industry ◽

Visual Inspection ◽

Meta Analysis ◽

Test Method ◽

Thermal Shock Test ◽

Shock Test ◽

Lack Of Information ◽

Number Of Cycles ◽

Brazilian Standard

The tests of Brazilian Standard NBR 15575: 2013 are part of the knowledge of the civil construction industry, but the heat and thermal shock test is innovative and does not have a consolidated history. The research objective is to analyze the testing critically and present proposals based on data meta-analysis. Results showed that the test is very inaccurate in describing the procedure and equipment. This study proposed adjustments and innovations in the test to provide more reliable results, but it does not make propositions regarding visual inspection and the number of cycles. The study concluded that the lack of information on the testing has direct responsibility for the results and that the suggested proposals have the potential to be incorporated.

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