Sains Malaysiana 38(6)(2009): 883–888

Prestasi Penyahikatan Pelarut dengan Menggunakan

Kaedah Reka Bentuk Uji Kaji

(Performance of Solvent Debinding using Design of Experiment Method)

Khairul Rijal Jamaludin*

Department of Mechanical Engineering

College of Science & Technology

Universiti Teknologi Malaysia

International Campus, 54100 Kuala Lumpur, Malaysia

Norhamidi Muhammad, Mohd Nizam Ab. Rahman &

Murtadhahadi

Department of Mechanical & Materials Engineering

Faculty of Engineering and Architecture

Universiti Kebangsaan Malaysia

43600 Bangi, Selangor, Malaysia

Sri Yulis M. Amin, Sufizar Ahmad & Mohd Halim Irwan Ibrahim

Universiti Tun Hussein Onn Malaysia (UTHM)

86400 Parit Raja, Batu Pahat Johor, Malaysia

Diserahkan: 14 Januari 2009 / Diterima: 24 April 2009

ABSTRAK

Proses penyahikatan pelarut telah diterima dengan meluas dalam proses pengacuanan suntikan logam (MIM) berdasarkan kemampuannya meningkatkan proses penyahikatan. Bahan pengikat boleh larut yang dikeluarkan dari jasad anum akan menghasilkan liang-liang yang akan membantu meningkatkan kadar penyahikatan terma. Kertas ini membentangkan pengoptimuman proses penyahikatan pelarut dengan menggunakan kaedah Taguchi. Pengaruh pembolehubah penyahikatan pelarut seperti suhu pelarut, taburan saiz partikel, beban serbuk dan tekanan penyuntikan juga dibincangkan. Dua jenis serbuk SS316L digunakan dalam kajian ini iaitu serbuk pengatoman gas dan pengatoman air. Kajian ini mendapati bahawa suhu pelarut memainkan peranan yang sangat penting dalam proses penyahikatan pelarut dan menyumbang sebanyak 91.602% (bagi serbuk pengatoman gas) dan 84.978% (bagi serbuk pengatoman air) terhadap kadar pengeluaran bahan pengikat. Bagaimanapun, taburan saiz partikel serbuk hanya menyumbangkan sebanyak 6.638% dan 12.228% bagi serbuk pengatoman gas dan pengatoman air masing-masing terhadap kadar pengeluaran bahan pengikat. Suhu pelarut menunjukkan tahap signifikan yang sangat tinggi iaitu α = 0.005 bagi kedua-dua jenis serbuk tersebut. Walau bagaimanapun, taburan saiz partikel serbuk SS316L menunjukkan tahap signifikan yang sederhana iaitu α = 0.025 dan α = 0.01 bagi kedua-dua padatan serbuk tersebut.

Kata kunci: Kaedah Taguchi; pengacuanan suntikan logam; penyahikatan air

ABSTRACT

Water leaching process has been widely accepted in Metal Injection Moulding(MIM) process based on its ability to enhance the debinding process. Soluble binder was extracted from the green body, which will develop pores that helped to increase thermal debinding rate. This paper presents the optimisation of the water leaching process using Taguchi method. The influence of the water leaching variables such as solvent temperature, particle size distribution, powder loading and injection pressure was discussed. Two types of SS316L powder were used in the experiment; gas atomised and water atomised powder. Results showed that solvent temperature played a very important role in the water leaching process when it contributes about 91.602% (for gas atomised powder) and 84.978% (for water atomised powder) to the binder extraction rate. However, powder particle size distribution only contributes 6.638% dan 12.228% for gas and water atomised powders, respectively to the binder extraction rate. Solvent tenperature demonstrated very high significant level, α = 0.005 for both powders. However the SS316L particle size distribution was moderately significant at α = 0.025, and α = 0.01 for both powder compact.

Keywords: Metal injection molding; Taguchi method; water leaching

RUJUKAN

German, R.M., & Bose, A. 1997. Injection molding of metals and ceramics. New Jersey: Metal Powder Industries Federation.

Iriany 2002. Kajian Sifat Reologi Bahan Suapan Yang Mengandungi Stearin Sawit Untuk Proses Pengacuan Suntikan Logam. Tesis Doktor Falsafah, Universiti Kebangsaan Malaysia.

Khairur Rijal Jamaludin, Norhamidi Muhamad, Sri Yulis M. Amin, Mohd Nizam Ab. Rahman, Muhammad Hussain Ismail. 2007. Optimal injection parameters for minimizing defects in metal injection molding (MIM): An experimental design. Proceedings of Advanced Processes and Systems in Manufacturing p. 49-57.

Lee, H.R., Shu, G.J. & Hwang, K.S. 2004. Effect of particle size on debinding of PIM parts. Advances in Powder Metallurgy & Particulate Materials 4: 147-153.

Mohd Afian Omar 1999. Injection molding of 316L stainless steel and Ni Cr Si B alloy powder using a PEG/PMMA binder. Ph. D Thesis, University of Sheffield, UK.

Muhammad Hussain Ismail 2002. Kesan Pembebanan Serbuk Logam Terhadap Fenomena Pemprosesan Dalam Pengacuan Suntikan Logam. Tesis Sarjana Sains, Universiti Kebangsaan Malaysia.

Omar, M.A., Ibrahim, R., Sidik, M.I., Mustapha, M. & Mohamad, M. 2003. Rapid debinding of 316L stainless steel injection moulded component. Journal of Materials Processing Technology 140: 397-400.

Ross, P.J. 1996. Taguchi Techniques for Quality Engineering. International Editions. USA: McGraw-Hill

Roy, R.K. 1990. A Primer on the Taguchi Method. Competative Manufacturing Series, New York: Van Nostrand Reinhold.

Sri Yulis M. Amin, Norhamidi Muhamad, Khairur Rijal Jamaludin & Shahrir Abdullah. 2007. Effect of powder loading on the solvent debinding of MIM parts. Proceedings of Advanced Processes and Systems in Manufacturing p. 77-84.

Sri Yulis M. Amin 2008. Pengoptimuman parameter penyahikatan pelarut bagi proses pengacuanan suntikan logam. Tesis Sarjana Sains, Universiti Kebangsaan Malaysia.

Wescot, E.J., Binet, C. & German, R.M. 2002. In situ monitoring of the dimensional changes and mechanisms during solvent debinding. Advances in Powder Metallurgy & Particulate Materials 10: 137-146.

*Pengarang untuk surat-menyurat; email: khairur@citycampus.utm.my