Effect of Different De-binding method on porosity and mechanical behavior of Metal Injection Molding Parts

سال انتشار: 1400
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 157

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شناسه ملی سند علمی:

IMES15_066

تاریخ نمایه سازی: 13 بهمن 1400

چکیده مقاله:

In metal injection molding process, primary de-binding method is depends on the feedstock type being used in metal injection molding process. In this research reason for primary de-binding and the process for major feedstock types are discussed. The equipment and process for the commercial used feedstock are described. Secondary de-binding and sintering have been combined into one step from the old three-step process used in the original MIM process. Thermal de-binding of the secondary binder is described and the consequences of incomplete de-binding discussed. Three types of feedstock are in commercial use today: one is wax-based feedstock where the wax is removed with an organic solvent. Second is polyacetal based feedstock where the polyacetal is removed by the catalytic reaction in presence of nitric acid vapor. Third is one where the primary component is water soluble. The result of this research show polyacetal is broken down first in the presence of an acid catalyst. Since this is achieved by solvents, organic or water, as well as the catalytic method, these three types of feedstock have found the widest applications. De-binding of these binder systems have been discussed in detail in this paper. The ratio of nitric acid vapor to nitrogen must be below ۴% for proper catalytic reaction. In case of the solvent systems the binder has to dissolve into the solvent and in case of the catalytic reaction, the catalyst has to be present at the surface for the reaction to proceed.

نویسندگان

M Moradjo

Ph.D. Candidate, Faculty of Material Science and Engineering, K. N. Toosi University of Technology, Tehran, Iran.

H Khorsand

Associate Professor, Faculty of Material Science and Engineering, K. N. Toosi University of Technology, Tehran, Iran.

A. Ghasemi

Master graduate, Faculty of Material Science and Engineering, K. N. Toosi University of Technology, Tehran, Iran.