니켈함유 공정 스크랩으로 부터 환원가스반응에 의한 철-니켈합금 분말 제조 연구

Abstract

A study on fabrication of Iron-Nickel alloy powder by gas reduction from by-product containing nickel

Joung Mu Sik

Department of Metallurgical Engineering, The Graduate School, Pukyoung National University

Abstract Ferro alloy is an alloy mainly composed of iron. It is an intermediate alloy made by alloying one or several kinds of elements with iron in order to increase the content of constituent elements. There are many kinds of ferro alloy such as Ferro manganese, ferro silicon, ferro chrome, ferromolybdenum , Ferrovanadium, ferrofospor, ferrotitan, ferro tungsten. Ferrous alloys are widely used in structural materials in particular because they have a wide range of mechanical and physical properties. Nickel alloys are exceptionally strong in acid and play a very important role in the chemical industry, and the demand for Inconel, a standard alloy used corrosive condition in high temperature, is increasing. It's because Nickel has an significant part in the development of special alloys such as Invar and Superalloy which are iron-nickel alloys that do not expand even when heated. It is advantageous in terms of permeability, thermal shock resistance and reactivity compared to porous materials of other materials. However, it has been said to have some weaknesses in that it must be started with expensive metal powder, has difficulty in controlling porosity, and has poor resistance to corrosion. In this study, we focused on developing elemental technology to overcome the elemental disadvantages of the porous metal body. The manufacturing process of the porous metal body proceeds with a process of mixing a metal powder with a pore-forming body, preparing a molded body, and then sintering the preform, which is a soft agglomerate in which the pore-forming body is produced. In this study, the technology to substitute metal powder with oxide powder was proposed as a way to significantly reduce the price of porous metal body. In the case of the oxide powder, since the oxide powder is inexpensive at 1/10 of the metal powder price and can be easily reduced above all things, it is considered possible to manufacture a metal porous body of excellent quality in the condition of using the oxide powder as an initial material if the process of effectively integrating reduction and sintering at the same time is developed. Particularly, in the case of the pure iron porous body, which has poor resistance to corrosion, corrosion resistance and strength are remarkably increased with a small amount of nickel alloyed. With that fact, for Fe-Ni alloy porous body, the technology of manufacturing Fe-Ni-based composite oxide powders was studied through the process of oxidizing and pulverizing by using lots of Fe-36Ni/77Ni scraps which are left behind in the industry. Therefore, the purpose of this study is to establish the basic data for producing alloy iron powders and to utilize it in the manufacturing process of composite powders by investigating the mechanism of the oxidation and reduction rate of ferrous alloy scraps to be used for the production of ferro alloy powders.