Abstract:
본 발명의 일 실시예에 따라 제조된 친수성으로 표면처리된 세라믹 분말은 친수성 유체 내에서 분산성이 향상된 입자를 이용한 나노 유체의 제조가 가능하다. 또한, 나노 크기의 입자를 대량으로 합성할 경우 비교적 간단한 공정으로 마이크론 크기의 입자를 제거하여 구조소재에서 기계적 물성저하를 방지하며 불량제품의 수율을 낮추는 효과가 있다. 또한, 상기와 같이 친수성으로 표면 처리함으로써 세라믹 분말의 분급을 더 세밀하게 분급화하여, 입도가 균일한 상태의 세라믹 분말을 제공할 수 있다.
Abstract:
PURPOSE: An underwater repairing method for damaged spots of water contacting surface and a device for the method are provided to facilitate repairing a damaged part by coating various metal powder particles with metal, or polymer, and ceramics. CONSTITUTION: An underwater repairing method for damaged spots of water contacting surface comprises follows. A chamber(100) having one open side is connected to the damaged part of surface-contacting water. The water is removed from the space, which is formed by the chamber and the damaged part of surface-contacting water, using a pump. A vacuum pump(131) keeps the space, from which water is removed, low pressure.
Abstract:
PURPOSE: A molding method of zirconium oxide powder, using a magnetism pulse compression molding device, and a zirconium oxide sintered body manufactured by the same are provided to reduce a pore of molded body inside by using the high molding pressure in a initial molding process. CONSTITUTION: A molding method of zirconium oxide powder, using a magnetism pulse compression molding device, comprises: a step of manufacturing the mixture by mixing a binder and water in ZrO2 powder; a step of charging the mixture in a mold of a magnetism pulse compression molding device after drying; a step of manufacturing a molding product by compression-molding the mixture loaded in the mold; and a step of manufacturing a sintered body by sintering the pressed and formed molding product.
Abstract:
PURPOSE: A method for improvement of the corrosion resistance of junction between titanium or titanium alloy and steel alloy using a silver diffusion control layer and a silver-copper-palladium insert is provided to prevent the deterioration of mechanical property of dissimilar junction when braze-joining titanium and stainless steel. CONSTITUTION: A method for improvement of the corrosion resistance of junction between titanium or titanium alloy and steel alloy is as follows. A silver diffusion control layer is formed in a titanium or titanium alloy base material. A silver-copper-palladium insert is interposed between the titanium or titanium alloy base material with the silver diffusion control layer and steel alloy. The silver-copper-palladium insert is heated to the melting temperature to join the titanium or titanium alloy base material and the steel alloy.
Abstract:
PURPOSE: A low temperature junction method of Ti/Ti-based alloys is provided to achieve improvement of strength by heating a zirconium-based interposer at a low temperature less than 900°C over the melting temperature to join Ti/Ti-based alloy base materials. CONSTITUTION: A low temperature junction method of Ti/Ti-based alloys is as follows. A zirconium-based interposer is positioned between the Ti/Ti-based alloy base materials and heated at a low temperature less than 900°C over the melting temperature, thereby joining the Ti/Ti-based alloy base materials. The zirconium-based amorphous interposer is composed of zirconium 20~50 atomic percentage, titanium 5~50 atomic percentage, copper 5~25 atomic percentage, nickel 1~20 atomic percentage, and beryllium 15~35 atomic percentage.
Abstract:
PURPOSE: A method of joining of pure Ti/Ti-base alloy and Fe-base steel alloy using Ag-based inserted material and an Ag diffusion control layer are provided to improve the toughness of a junction and to have brittle protecting by suppressing intermetallic compound. CONSTITUTION: A silver diffusion control layer(B) is formed in titanium or Ti alloy base material. An silver system interposer which does not contain the titanium component are placed between steel series alloy(A2) and the titanium or titanium alloy base material, in which the silver diffusion control layer. The silver system interposer is heated at a melting point of the interposer and the titanium or titanium alloy base material and the steel series alloy are connected.
Abstract:
본 발명은 물과 접촉하는 표면 중 손상부의 수중 보수방법 및 이에 사용되는 수중 보수장치에 관한 것이다. 본 발명의 보수방법은 손상된 표면을 주변부로부터 차단하기 위하여 챔버를 손상부에 접촉시키는 단계; 상기 챔버 내부의 물을 제거하는 단계; 물이 제거된 공간을 저압상태로 유지하는 단계; 및 챔버 내부에 구비된 용사건으로 손상부에 입자를 분사하여 코팅하되, 상기 공간을 저압상태로 계속 유지하는 단계를 포함하며, 이를 위한 장치는 일면이 개방된 챔버; 물을 제거하기 위한 펌프; 진공펌프; 용사건; 및 용사기를 포함한다. 본 발명에 따르면, 수중에 위치한 표면의 손상부를 보수하기 위하여 이를 물 밖으로 꺼낼 필요가 없게 되어, 다양한 이유로 보수 대상을 물 밖으로 꺼내기가 용이하지 않은 경우에 유용하게 적용될 수 있는 효과가 있다.