- Direct Bonding of Cu/AlN using Cu-Cu2O Eutectic Liquid
-
Junsung Hong, Jung-Hoon Lee, You-Na Oh, Kwang-Jun Cho, Doh-Hyung Riu, Sung-Tag Oh, Chang-Yong Hyun
-
J Powder Mater. 2013;20(2):114-119.
-
DOI: https://doi.org/10.4150/KPMI.2013.20.2.114
-
-
20
View
-
0
Download
-
1
Citations
-
 Abstract
 PDF
- In the DBC (direct bonding of copper) process the oxygen partial pressure surrounding the AlN/Cu bonding pairs has been controlled by Ar gas mixed with oxygen. However, the direct bonding of Cu with sound interface and good adhesion strength is complicated process due to the difficulty in the exact control of oxygen partial pressure by using Ar gas. In this study, we have utilized the in-situ equilibrium established during the reaction of 2CuOrightarrowCu_2O + 1/2 O_2 by placing powder bed of CuO or Cu_2O around the Cu/AlN bonding pair at 1065sim1085°C. The adhesion strength was relatively better in case of using CuO powder than when Cu_2O powder was used. Microstructural analysis by optical microscopy and XRD revealed that the interface of bonding pair was composed of Cu_2O, Cu and small amount of CuO phase. Thus, it is explained that the good adhesion between Cu and AlN is attributed to the wetting of eutectic liquid formed by reaction of Cu and Cu_2O.
-
Citations
Citations to this article as recorded by  - Low-Temperature Sintering Behavior of Aluminum Nitride Ceramics with Added Copper Oxide or Copper
Jin-Geun Hwang, Kyung-Sik Oh, Tai-Joo Chung, Tae-Heui Kim, Yeong-Kyeun Paek
Journal of the Korean Ceramic Society.2019; 56(1): 104. CrossRef
- Evaluation of Creep Reliability of Powder Metallurgy and Cast-type Ni-based Superalloy by Using Ultrasonic Wave
-
Chan-Yang Choi, Jin-Hun Song, Se-Ung Oh, Chung-Seok Kim, Sook-In Kwun, Sung-Tag Oh, Chang-Yong Hyun, Jai-Won Byeon
-
J Korean Powder Metall Inst. 2012;19(3):215-219.
-
DOI: https://doi.org/10.4150/KPMI.2012.19.3.215
-
-
Abstract
PDF
- An attempt was made to evaluate creep reliability of two commercial Ni-based superalloys by using ultrasonic wave. The materials include fine-grained PM alloy fabricated by mechanical alloying and subsequent hot isostatic pressing, and IN738LC cast alloy with a grain size of a few cm. Microstructural parameters (fraction of creep cavity and size of gammaprime precipitates) and ultrasonic parameters (velocity, attenuation) were measured to try to find relationships between them. Ultrasonic velocity decreased with creep cavity formation in PM alloy. On the other hand, no distinct changing trend of ultrasonic velocity was observed for IN738LC alloy. Ultrasonic attenuation was found to have a linear correlation with the size of gammaprime precipitates and was suggested as a potential parameter for monitoring creep reliability of IN738LC alloy.
- Improvement of Pot Life in the Epoxy Resin-based Adhesive Formulation by Size Control and Coating of Curing Accelerator Powders
-
Jun-Sik Lee, Chang-Yong Hyun, Jong-Hyun Lee
-
J Korean Powder Metall Inst. 2008;15(2):119-124.
-
DOI: https://doi.org/10.4150/KPMI.2008.15.2.119
-
-
Abstract
PDF
- To increase pot life in the formulation mixed with bisphenol F epoxy resin, anhydride-based curing agent, and imidazole-based curing accelerator powders as a paste material for high-speed RFID chip bonding, size variation of the imidazole-based powders and a coating method of the powders were adopted in this study. In experiment with regard to the size variation, the pot life was not outstandingly increased. Through the idea using the coating method, however, the pot life was increased up to 4.25 times in comparison with the addition of initial imidazole-based powders. Consequently, successive bonding of RFID chip could be performed with very short time of 5sec using the suggested formulation having improved pot life.
- Magnetic Pulsed Compaction and Sintering Characteristics of Al Composite Powders Reinforced with Waste Stainless Steel Short Fibers
-
Chang-Yong Hyun, Chul-Hyun Won, Jae-Soon Park
-
J Korean Powder Metall Inst. 2007;14(6):380-385.
-
DOI: https://doi.org/10.4150/KPMI.2007.14.6.380
-
-
Abstract
PDF
- Characteristics of Al-based composites with waste stainless steel short fiber, fabricated by magnetic pulsed compaction and sintering were investigated. The compacts prepared by magnetic pulsed compaction showed high relative density and homogeneous microstructure compared with that by conventional press compaction. The relative density of sintered composites at 430°C for 1 h exhibited the same value with compacts and decreased with increase in STS short fiber content. The reaction between Al and STS phase was confirmed by the microstructural analysis using EDS. The sintered composites, prepared by magnetic pulsed compaction, showed increased hardness value with increasing STS fiber content. Maximum yield strength of 100 MPa and tensile strength of 232 MPa were registered in the AI-based composite with 30 vol% STS short fiber.
|
kpmi
