Abstract:
According to the present invention, a Cu/Al hybrid alloy material includes: one or more Cu material layers containing Cu of 70% or more; one or more Al material layers containing Al of 80% or more; and one or more intermediate metal layers which inhibits diffusion and reaction of Cu and Al in an interface of the Cu material layer and the Al material layer. The Cu/Al hybrid alloy material has a multilayered structure in which there are three layers or more and the intermediate metal layer is interposed between the Cu material layer and the Al material layer. According to the present invention, the intermediate metal layer for inhibiting diffusion and reaction of Cu and Al is interposed between the Cu material layer of which a main element is Cu and the Al material layer of which a main element is Al. Therefore, when the Cu/Al hybrid alloy material is used for bonding the Cu material layer and the Al material layer or is used at high temperatures, generation of a compound in the interface between the Cu material layer and the Al material layer can be prevented.
Abstract:
PURPOSE: A zirconium-ceramic hybrid tube for a nuclear fuel rod coating pipe and a manufacturing method thereof obtain the excellent ductility and low absorption properties of zirconium and the excellent heat resistance and corrosion resistance properties of ceramic by forming the zirconium-ceramic hybrid tube in a multi-layer structure of a zirconium tube and a ceramic tube. CONSTITUTION: A zirconium-ceramic hybrid tube (10) has a two-layer structure of a zirconium tube (11) and a fiber type ceramic tube (12). The ceramic tube is composed of fiber type ceramic or monolithic ceramic. The zirconium tube is composed of zirconium or a zirconium alloy. One or more ceramic tubes and one or more zirconium tubes form a multi-layer structure by being successively laminated in a concentric form. A graphite tube is interposed between the ceramic tube and the zirconium tube.
Abstract:
PURPOSE: A zirconium alloy for nuclear fuel jacket pipe is provided to improve mechanical properties and corrosion resistance required for the nuclear fuel jacket pipe. CONSTITUTION: A zirconium alloy for nuclear fuel jacket pipe is made of a zirconium comprising at least one component selected from a group composed of 0.2-5 wt% of Nb, 0.001-0.3 wt% of Fe, and 0.001-1 wt% of Sn; at least one component selected from a group composed 0.1-5 wt% of Ti and 0.1-5 wt% of Al; and the rest of unavoidable impurities. [Reference numerals] (AA) Amount of increased weight after 100 hours (mg/dm^2); (BB,LL) Example 1; (CC,MM) Example 2; (DD,NN) Example 3; (EE,OO) Example 4; (FF,PP) Example 5; (GG,QQ) Example 6; (HH,RR) Example 7; (II,SS) Example 8; (JJ,TT) Comparative example; (KK) Amount of increased weight after 200 hours (mg/dm^2)
Abstract:
PURPOSE: A method for recovering a pure Zr from an off-grade-scrap by using the molten salt electrolytic refining process is provided to build a closed system of recycle of salt, which is used as electrolyte, in a view of material balance, thereby simultaneously satisfying environmental performance and economical efficiency compared to the prior art. CONSTITUTION: A molten salt electrolytic refining process comprises the following steps: forming an electrolytic refining cell that includes constant potentiostat and molten salt which is an ionic liquid as an electrolyte; controlling a cut-off potential and an application current density between the positive electrode and the negative electrode and electroplating Zr by moving the Zr from the positive electrode to the negative electrode; causing the electrolyte to suppress the disproportionation between the same type of ions at a time of refining by using fluoride electrolyte composition and to selectively recover only pure Zr except for the main impurity element of off graded Zr; and blocking the co-deposition of metal impurity particles on an electrodeposit during the electrolytic refining process by arranging, between the positive electrode and the negative electrode, a partition film that is made of Ni.
Abstract:
(1) 복수의 클래드 판재를 적층시키되, 복수의 클래드 판재 사이마다 중간접합재로서 크롬(Cr), 지르코늄(Zr), 은(Ag) 및 마그네슘(Mg)으로 이루어지는 군으로부터 선택되는 적어도 1종 이상의 원소를 함유하는 열처리형 구리합금을 삽입시켜 클래드 판재 적층구조물을 형성시키는 제1단계; (2) 상기 클래드 판재 적층구조물을 용체화시키는 제2단계; (3) 상기 클래드 판재 적층구조물을 접합시키는 제3단계; 및 (4) 상기 접합된 클래드 판재 적층구조물을 시효처리하는 제4단계;를 포함하여 이루어지는 클래드 판재의 제조방법이 개시된다. 본 발명에 의할 경우 중간접합재의 기계적 강도, 비강도 특성을 향상시킴과 아울러 클래드 판재와 중간접합재 간에 치밀한 접합이 이루어지게 하여 클래드 판재의 내구성 및 신뢰성을 향상시킬 수 있게 된다.
Abstract:
PURPOSE: A Cu-based hybrid alloy ensuring high strength, high elasticity, high corrosion resistance, wear resistance, and high conductivity at the same time and a manufacturing method thereof are provided to increase the strength of a hybrid alloy and join Cu alloys even at room temperature by using HPT(High Pressure Torsioning). CONSTITUTION: A method for manufacturing a Cu-based hybrid alloy comprises the steps of: preparing a Cu alloy A selected from the group consisting of Cu-Zn, Cu-Al, Cu-Ni-Zn, Cu-Ni-Si, Cu-Ni-Sn, and Cu-Ni-Si-Sn or melt thereof, preparing a Cu alloy B selected from the group consisting of Cu-Cr, Cu-Zr, Cu-Ag, Cu-Mg, and Cu-Cr-Zr or melt thereof, laminating the Cu alloys A and B in two or more layers and attaching the laminated alloys, and casting the melt of the Cu alloys in parallel.
Abstract:
PURPOSE: A clad sheet manufacturing method and a clad sheet being manufactured by the same are provided to prevent detects and cracks of an intermediate material because a copper alloy containing silver is utilized as an intermediate binder. CONSTITUTION: A clad sheet manufacturing method is as follows. Several clad plates are laminated. An intermediate copper alloy binder is inserted into between the clad plates so that a laminated clad sheet structure is formed. The intermediate copper alloy binder contains 0.5 to 20wt.% of silver. The laminated clad sheet structure is welded. The clad plate selects one or more kinds from a group being composed of titanium, a Ti alloy, carbon steel, alloy steel, and stainless steel.