분말사출성형용 Sr-ferrite/Paraffin Wax/Carnauba Wax/HDPE 복합재료에서 열분해에 의한 Carnauba Wax/HDPE의 제거

조태식; 정원용; 문탁진

Polymer(Korea), Vol.19, No.1, 87-94, January, 1995

Thermal Debinding of Carnauba Wax/HDPE from Sr-ferrite/Paraffin Wax/Carnauba Wax/HDPE Composites for Powder Injection Molding

조태식, 정원용, 문탁진

초록

분말사출성형에서 사출된 성형체를 소결하기 위해서는 사용된 paraffin wax와 carnauba wax/HDPE 결합제를 용매추출법과 열분해법으로 각각 제거하여야 한다. 본 연구에서는 용매추출로 paraffin wax를 제거한 성형체의 잔류결합제인 carnauba wax/HDPE의 열분해에 의한 제거 공정이 조사되었다. 열분해에 의한 결합제의 제거를 쉽게하는 연속적인 기공은 30wt%이상의 paraffin wax를 용매추출로 제거할때 성형체 내에 형성되었다. Carnauba wax/HDPE의 결합제 제거속도는 용매추출된 paraffin wax의 양에 비례하지만, 연속적인 기공을 형성하면서 성형체의 강도를 만족하는 paraffin wax의 양은 결합제의 약 50wt%이었다. 결함없이 열분해로 결합제 제거가 가능한 성형체 내의 carnauba wax/HDPE 결합제조성은 50 : 50wt%이었다. 최적의 분말사출 성형이 가능한 결합제의 전체조성은 paraffin wax : carnauba wax : HDPE=50 : 25 : 25wt% 이었으며, paraffin wax가 용매추출된 후 carnauba wax/HDPE는 결함없이 4시간의 열분해로 제거가 가능하였다.

The paraffin wax and carnauba wax/HDPE in powder injection molded compacts should be removed before sintering. The removal of paraffin wax and carnauba wax/HDPE is usually done by the solvent extraction and thermal debinding methods, respectively. The thermal debinding of carnauba wax/HDPE, which follows the extraction of paraffin wax using n-heptane solvent, is investigated in this work. The continuous pores, which facilitate the removal of carnauba wax/HDPE by the thermal debindlng, are found to form in the compacts when more than 30wt% of the paraffin wax is removed by the solvent extraction. The removal rate of carnauba wax/HDPE increases with the amount of removed paraffin wax. The optimum binder composition at which the binder is removed by thermal debinding without defects while maintaining the compact strength is paraffin wax carnauba wax : HDPE=50 : 25 : 25wt%. It takes about 4 hrs to remove carnauba wax/HDPE in compacts with the optimum composition by the thermal debinding.

Keywords:powder injection molding;thermal debinding;carnauba wax;HDPE

[References]

Pease LF, Int. J. Powder Metall., 22, 177 (1986)
German RM, "Powder Injection Molding," MPIF, NJ, 99 (1990)
Wiech RE, U.S. Patent, 4,305,756 (1981)
Wiech RE, U.S. Patent, 4,404,166 (1983)
Rivers RD, U.S. Patent, 4,113,480 (1978)
Nakamura H, U.S. Patent, 4,721,599 (1988)
Lin ST, German RM, Powder Metall. Int., 21, 19 (1989)
Merhar JR, The 1988 Intern. Powder Metall. Conf., Orlando, F1 (1988)
Kipphut CM, German RM, Int. J. Powder. Metall., 27, 117 (1991)
Messler RW, Metal Powder Report, 5, 363 (1990)
Allcock HR, Lampe FW, "Contemperary Polymer Chemistry," p. 148, Prentice Hall, New Jersey (1990)
Schnabel W, "Polymer Degradation," p. 197, Macmillan Publishing Co., New York (1981)

[Referenced By]

[1] Pease LF, Int. J. Powder Metall., 22, 177 (1986)

[2] German RM, "Powder Injection Molding," MPIF, NJ, 99 (1990)

[3] Wiech RE, U.S. Patent, 4,305,756 (1981)

[4] Wiech RE, U.S. Patent, 4,404,166 (1983)

[5] Rivers RD, U.S. Patent, 4,113,480 (1978)

[6] Nakamura H, U.S. Patent, 4,721,599 (1988)

[7] Lin ST, German RM, Powder Metall. Int., 21, 19 (1989)

[8] Merhar JR, The 1988 Intern. Powder Metall. Conf., Orlando, F1 (1988)

[9] Kipphut CM, German RM, Int. J. Powder. Metall., 27, 117 (1991)

[10] Messler RW, Metal Powder Report, 5, 363 (1990)

[11] Allcock HR, Lampe FW, "Contemperary Polymer Chemistry," p. 148, Prentice Hall, New Jersey (1990)

[12] Schnabel W, "Polymer Degradation," p. 197, Macmillan Publishing Co., New York (1981)