Abstract:
PURPOSE: A plaster casting device using vibration and pressurization for producing a prototype of a die-casting process and a method thereof are provided, which can obtain uniform internal density and completely fill even thin walls by injecting molten metal into a plaster mold at low pressure and by directly applying vibration to the molten metal. CONSTITUTION: The method for producing the prototype of the die-casting process is characterized in that: a pressurizing device to directly pressurize molten metal in a plaster mold, which comprises a cylinder(11) injecting the molten metal into the plaster mold at low pressure, a speed controller(12) controlling the speed of the cylinder(11), and a plunger(14) directively pressurizing the molten metal; and a vibrating device to directly vibrate the molten metal, which comprises an excitation part(21) vertically exciting a vibration plate(24) and a vibration controller(23) controlling the amplitude and frequency of the excitation part(21).
Abstract:
석출경화형 고강도, 고연성 및 경량성이 우수한 경량 강재 및 그 제조 방법에 대하여 개시한다. 본 발명에 따른 경량 강재는 중량%로, 망간(Mn) : 10.0~15.0%, 알루미늄(Al) : 6.0~9.0%, 크롬(Cr) : 3.0~5.0%, 탄소(C) : 0.8~1.2% 및 나머지 철(Fe)과 불가피한 불순물로 이루어지고, 주상은 오스테나이트 상이며, 제2상으로 페라이트 상과 나노 κ-카바이드((Fe,Mn) 3 AlC) 입자를 포함하는 복합조직을 갖는 것을 특징으로 한다.
Abstract:
PURPOSE: Non-normalized steel with an ultrafine grained pearlite structure and a preparation method thereof are provided to obtain an ultrafine grained colony and lamella structure by restricting ferrite transformation and continuous cooling pearlite transformation and inducing low-temperature pearlite. CONSTITUTION: A method for preparing non-normalized steel with an ultrafine grained pearlite structure comprises the steps of: compressing a steel material at high temperatures, rapidly cooling the hot-forged body to a low-temperature pearlite transformation range, maintaining the super-cooled hot-forged body at a constant temperature in the low-temperature pearlite transformation range, and air-cooling the hot-forged body.
Abstract:
코어-쉘 나노와이어가 제공된다. 본 발명에 따른 코어-쉘 나노와이어 어레이는, 기판과 평행한 형태의 나노와이어; 및 상기 나노와이어 상부에 코팅된 코팅층을 포함하는 것을 특징으로 하며, 본 발명에 따르면, 포토 리쏘그래피(Photo lithography)와 임프린트(imprint) 등과 같이, 기존의 모든 나노 스케일이 가능한 리쏘그래피(Lithography)를 이용하여 나노와이어 어레이 구조를 형성한 후 코어-쉘 나노와이어 어레이 구조를 형성할 수 있다.
Abstract:
A core-shell nanowire is provided. A core-shell nanowire array according to the present invention includes: a nanowire which is parallel to a substrate; and a coating layer which is coated on the upper side of the nanowire. According to the present invention, a core-shell nanowire array structure is formed after a nanowire array structure is formed using an existing lithography with all of the nanoscales like photolithography, an imprint, and the likes. [Reference numerals] (AA) Produce a first nano wire;(BB) Coat the first nano wire with a second material;(CC) Produce a core-shell nano wire