Abstract:
The present invention relates to a lead-free solder and semiconductor components comprising the same. More specifically, The lead-free solder contains 0.5-1.0 wt% of copper (Cu), 0.001-0.1 wt% of palladium (Pd), and the remnant which is composed of tin (Sn). The present invention is environmentally friendly and has excellent high-temperature safety and excellent wetting properties, thereby enabling to obtain usable lead-free solder for the car semiconductor.
Abstract:
PURPOSE: A method of surface modification of a nickel-based superalloy by electron beam induced surface alloying is provided to obtain a protective coating that is stable in high-temperature oxidation conditions and thereby maintains the integrity of the nickel-based superalloy for long-time use. CONSTITUTION: A method of surface modification of a nickel-based superalloy by electron beam induced surface alloying comprises the steps of: grinding the surface of the nickel-based superalloy with a silicon carbide, depositing aluminum on the ground surface of the nickel-based superalloy, loading the superalloy in a vacuum chamber, and irradiating the superalloy with electron beams to form a micro-alloy layer on the superalloy surface.
Abstract:
PURPOSE: A method for preparing a nickel-based alloy having a modified surface is provided to improve the oxidation-resistance and corrosion-resistance of a nickel-based alloy by consecutively supplying a large amount of aluminum to a cracked oxide film. CONSTITUTION: A method for preparing a nickel-based alloy having a modified surface is as follows. Aluminum or nickel aluminide is physically plated on the surface of a nickel based alloy. A laser beam is irradiated to the nickel based alloy plated with the aluminum or nickel aluminide.
Abstract:
본 발명은 니켈기 초합금(Ni-base superalloy)의 표면에 미세 합금화층을 형성하여 니켈기 초합금 표면을 개질하는 방법에 관한 것으로서, 니켈기 초합금(Ni-base superalloy)의 표면을 실리콘 카바이트(SiC)로 연마하는 단계, 상기 연마된 니켈기 합금의 표면에 알루미늄을 증착하는 단계 및 상기 알루미늄이 증착된 니켈기 합금의 표면을 진공 챔버 내에 넣고, 전자빔을 조사하여 표면에 미세 합금화층을 형성하는 것을 특징으로 하며, 본 발명에 따른 표면 미세 합금화된 니켈기 초합금은 전자빔을 이용해 니켈기 초합금의 표면을 미세 합금화 시킴으로써 고온 산화 환경 하에서 안정적인 보호피막을 형성하여 장기간 사용 시에도 건전성(integrity)을 유지할 수 있으며, 전자빔을 이용해 표면 근처의 조성 및 미세구조를 바꾸어 니켈기 초합금의 고온 산화 저항성을 향상시키고 및 우수한 크립 특성을 가져서 차세대 초고온 가스 냉각로의 열교환기 및 고온 가스로에 활용할 수 있다.
Abstract:
PURPOSE: A method of manufacturing surface-reformed nickel-base alloy is provided to enhance long-term oxidation resistance and corrosion resistance since aluminum can be continuously supplied. CONSTITUTION: A method of manufacturing surface-reformed nickel-base alloy comprises next steps. Aluminum or nickel aluminide is physically deposited on the surface of nickel-base alloy(a first step). An inter-diffusion thermal treating process is performed under a temperature of 550~650°C(a second step). The thickness of an aluminum or nickel aluminide deposited layer formed by the first step is 3 ~ 6μm. An inter-metal compound coated layer of Al3Ni2 is formed on the surface of the nickel-base alloy from the second step. The thickness of the inter-metal compound coated layer is 10 ~ 20μm.
Abstract:
PURPOSE: A diffusion bonding method of nickel-base alloy is provided to enable stable manufacturing of a heat exchanger at a temperature of over 900°C, which is an operation condition of an ultra-high gas cooling furnace. CONSTITUTION: A diffusion bonding method of nickel-base alloy comprises next steps. Aluminum or nickel aluminide is physically deposited on the surface of the nickel-base alloy(a first step). An inter-diffusion thermal treating process is performed under a temperature of 550 ~ 650°C to form an inter-metal compound layer(a second step). A diffusion bonding process is performed between two kinds of nickel-base alloy with the inter-metal compound layer manufactured from the second step, using the inter-metal compound layer as a bonding unit(a third step). The diffusion-bonded nickel-base alloy manufactured from the diffusion bonding method of the nickel-base alloy is provided.