• 마이크로전자및패키징학회지
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• 제14권4호
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• pp.49-56
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• 2007

습식 개질전처리를 통해 무전해 도금 니켈/폴리이미드 박막을 형성하였으며, 이때 도금 후처리 공정인 후속 열처리 조건에 따른 무전해 니켈 도금 박막과 폴리이미드 사이의 필 강도를 $180^{\circ}C$인 경우 필 강도는 $38.6{\pm}1.1g/mm$에서 $180^{\circ}C$ 처리 시에 $26.8{\pm}2.2g/mm$로 감소하였다. 습식 개질전처리에 의해 폴리이미드 표면에 형성된 carboxyl 결합과 amide결합은 니켈과 폴리이미드 사이의 계면 접착기구와 밀접한 연관성이 있는 것으로 판단된다. 후속 열처리 온도에 상관없이 파괴경로는 모두 폴리이미드 내부였으며, 이때 후속 열처리 온도에 따른 무전해 니켈 도금 박막과 폴리이미드 사이의 박리 강도 거동은 파면 부근에 형성된 carbonyl oxygen결합의 감소와 밀접한 연관성이 있는 것으로 판단된다.

• 한국진공학회지
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• 제10권3호
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• pp.298-302
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• 2001

초청정을 요구하는 진공용기의 내벽세정을 위한 RF 및 DC 방전세정장치를 제작하여 여러 가지 방전조건에 따라 세정효과를 조사하였다. Baking없이 방전세정만을 수행하였을 때는 baking만 진행했을 때와 비슷한 세정효과를 나타내었으며 세정후의 탈기체율은 반으로 줄어들었다. Baking과 방전세정을 동시에 진행하면 세정효과가 매우 증대되어 세정후의 탈기체율이 1/20으로 감소하였다. Baking과 방전세정을 동시에 수행 시 여러 방전조건에 따른 세정효과를 조사하였는데 이온이 진공용기 내벽에 부딪히며 세정을 할 때 이온에너지와 이온밀도가 중요한 역할을 하는 것으로 보였다. 진공용기를 세정함에 있어 RF방전세정이 DC 방전세정보다 효과적이라는 결과를 얻었다.

• 한국포장학회지
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• 제26권1호
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• pp.1-9
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• 2020

We evaluated the applicability of baking soda, charco'al, coffee, and green tea as a natural deodorant in Kimchi packaging. Moreover, to evaluate the potential usage of these deodorants in packaging materials and confirm their applicability in high-temperature melt-extrusion processing, the thermal stabilities of the deodorants were investigated, and heat-treated deodorants were evaluated in terms of the deodorizing function compared with non-treated deodorants. Aroma patterns were decreased after deodorizing treatment with all-natural deodorants. Dimethyl disulfide, methyl trisulfide, and diallyl disulfide, the most significant odorous Volatile organic compounds (VOCs) of Kimchi, decreased after treatment with the deodorants. In particular, baking soda and charcoal showed the highest efficiency in removing odorous compounds and VOCs from Kimchi, even after high-temperature processing. The acetic acid removal rates for both baking soda and charcoal were 99.9±0.0%. The heating process increases the deodorizing effects of baking soda. Sensory evaluation results showed that there is a significant increase (p < 0.05) in the overall preference for Kimchi samples packaged with charcoal and baking soda. This study provides useful information for the deodorization effects of natural deodorants for Kimchi smell and their applicability for packaging materials.

• 대한금속재료학회지
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• 제49권12호
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• pp.967-976
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• 2011

Conventional fracture tests of resistance spot welds have been performed without consideration of the paint baking process in the automobile manufacturing line. The aim of this paper is to investigate the effect of the paint baking process on load carrying capacity and fracture mode for resistance spot welded 590 dual phase (DP), 780DP, 980DP, 590 transformation in duced plasticity (TRIP), 780TRIP and 1180 complex phase (CP) steels. With paint baking after resistance spot welding, the l-shape tensile test (LTT) and nano-indentation test were conducted on the as-welded and paint baked samples. Paint baking increased the load-carrying capacity of the resistance spot welded samples and improved the fracture appearance from partial interfacial fracture (PIF) to button fracture (BF). Improvement in fracture appearance after LTT is observed on weldments of 780 MPa grade TRIP steels, especially in the low welding current range with paint baking conditions. The higher carbon contents (or carbon equivalent) are attributed to the low weldability of the resistance spot welding of high strength steels. Improvement of the fracture mode and load carrying ability has been achieved with ferrite hardening and carbide formation during the paint baking process. The average nano-indentation hardness profile for each weld zone shows hardening of the base metal and softening of the heat affected zone (HAZ) and the weld metal, which proves that microstructural changes occur during low temperature heat treatment.

• 소성∙가공
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• 제15권8호
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• pp.621-627
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• 2006

Recently, micro-alloyed steels which could eliminate heat treatments after forging has been developed. These non heat-treated micro-alloyed steels have several advantages over the conventional quenched and tempered steel for cold forging. First of all, long components can be fabricated with a better dimensional accuracy since bending of long forged part after quenching treatment could be avoided. And it is possible to eliminate two energy consuming heat treatment steps, which are a spherodizing before forging and quenching/tempering after forging. Therefore, more cost effective and environment friendly process could be designed. However, there is non-uniform distribution of strain occurred across the forged part, since these non heat-treated micro-alloyed steel use strain hardening mechanism. In the present study, it was investigated how to lessen non-uniformity and increase strength together for cold forging when a baking heat treatment is applied in micro-alloyed steels. For this purpose, micro-alloyed steels developed by Se-A Besteel recently was used for the experiment.

• 소성∙가공
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• 제30권2호
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• pp.61-68
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• 2021

As part of efforts to reduce the weight of automotive body-in-white, a hybrid center pillar with high strength 7075 aluminum alloy (AA7075) sheet and carbon fiber reinforced plastic (CFRP) has been recently studied. In the fabrication of the AA7075-CFRP hybrid center pillar, the AA7075 sheet might go through heating-forming-in-die quenching (HFQ), artificial aging, hybridizing, and then paint baking processes. In this study, we investigate the effects of the heat treatment history associated with each process on the tensile strength of the AA7075 sheet. Typical heat treatment conditions are HFQ for 20 minutes at 480℃ and then cooling down with die, artificial aging of T6 temper for 24 hours at 120℃, hybridizing for 10 minutes at 150℃, and paint baking for 20 minutes at 180℃. The tensile strength of the AA7075 sheet is continuously increased by a series of heat treatments of hybridizing and paint baking and is expected to have yield stress above 500MPa without artificial aging of T6 temper.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1996년도 춘계학술대회 논문집
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• pp.697-703
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• 1996

Fatigue strength of high strengthsteels are variable with many different surface treatment. It is well known that residual compressive stress retard fatigue crack growth rate(or arrest crack). High strngth steels are manufactured by following process. Heat treatment, shot peening and chromium plating process. High strength steel(HRC40 or above) which are subjected to fatigue load and dynamic load, chromium plated parts shall be peened in accordance with requirements and baked after plating. The purpose of this paper is to compare and discuss the influence of surface treatment and hydrogen embrittlement on fatigue strength of high strength steel. Therefore, fatigue test was performed to investigate influence of surface treatment. The results shows that shot peening is very effect method in creasing fatigue life and after plating, baking process is essential to prevent hydogen failure. In this paper, the experimental investigation is made to clarify the influence of shot peening conditions and baking process on fatigue strength of high strength steel.

• 한국식품조리과학회지
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• 제21권4호
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• pp.490-495
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• 2005

튀김으로 조리하는 대표적인 식품인 돈까스를 통해 지방섭취를 줄이고 칼로리를 낮출 수 있는 조리방법을 제안하기 위해 본 연구를 수행하였으며 그 결과는 다음과 같다. 돈까스를 기름에 튀기는 Frying보다 Oven baking으로 조리한 돈까스의 일반성분 분석에서 기름에 튀긴 돈까스보다 오븐에 구운 돈까스의 지방함량이 낮게 나타났고(p<0.05) 물성과 색도에서도 Frying과 Oven baking은 대부분의 항목에서 유의적인 차이가 있었다. 특히 칼로리 분석에서 Oven baking 조리한 돈까스는 Frying으로 조리한 돈까스보다 약 $10\%$가량의 칼로리가 낮은 (p<0.05) 경향을 보여 일반성분 분석, 관능테스트 결과와 일치하였으며 식이요법을 요하는 사람들에게 권장 할 수 있는 조리방법이라 사료된다. 하지만 관능테스트에서 전통적인 튀김방식의 돈까스가 다즙성과 전체적인 맛에서는 오븐에 구운 돈까스보다 다소 우수한 결과를 보였다.

• Journal of Welding and Joining
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• 제18권2호
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• pp.222-222
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• 2000

PBGA(Plastic Ball Grid Array) is composed of some materials such as PCB(Printed Circuit Board), epoxy molding compound, die attach and so on. Reliability of PBGA package is weak compared with plastic packages. The weak points of reliability are the lower resistance to popcorn cracking, which is induced by moisture absorption in PCB, and the pressure cooker test corrosion, which is the basic problem due to the material characteristics of PCB. Introducing the PCB baking and the plasma treatment cleared the popcorn cracking phenomenon. The PCB baking and plasma treatment reduced the epoxy void by eliminating the source of moisture vaporization during the epoxy curing and enhanced the adhesion between PCB and epoxy. Also, plasma treatment enhanced the wettability of epoxy on PCB. The problem of corrosion is cleared using multi-functional epoxy. This type of EMC(Epoxy Molding Compound) is recommended in package using PCB as a substrate. (Received November 19, 1999)

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.244-249
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• 2008

It happened a failure on special bolt which supported main landing gear actuator up-lock rod of 00 aircraft. Fracture was occurred at end of center drilled hole and thread machined on bolt. Metallographic, fractographic, and other characteristics of embrittlement analysis and experiments carried out on the failed bolt to find out the reason. Bolt surface was cadmium electroplated(EP) to give lubrication and provide excellent corrosion resistance. Resultly, Bolt was failed due to cadmium embrittlement occurred during baking treatment as well as center drilled hole. for the failure that are relevant to failure analysis and prevention. For their successful functional application, cadmium EP bolts require proper and adequate baking treatment after electroplating, and is complete with no center drilled hole