Plastic and nonmetallic article shaping or treating: processes – Including step of generating heat by friction
Patent
1994-04-20
1997-12-16
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Including step of generating heat by friction
264 65, 264 66, C04B 3526, C04B 3538
Patent
active
056981457
ABSTRACT:
A method for sintering Mn--Zn ferrite green compacts is provided which includes a first heating step of raising the temperature from room temperature to 600.degree. C. within a period from 30 minutes to 5 hours, a second heating step of raising the temperature from 600.degree. C. to the sintering temperature and holding the sintering temperature until the start of cooling within a period shorter than 10 hours, and a cooling step of lowering the temperature to 150.degree. C. within a period longer than 3 hours, with the total period of the three steps being shorter than 20 hours. This method permits the efficient production in a short time of Mn--Zn ferrites having good magnetic properties.
REFERENCES:
patent: 4093688 (1978-06-01), Withop
patent: 4097392 (1978-06-01), Goldman et al.
patent: 4247500 (1981-01-01), Dixon et al.
patent: 4350651 (1982-09-01), Movell
"Soft Ferrites" Sadatoro Hiraga, Bulletin of the Japan Institute of Metals, vol. 24, No. 4 (1985) (Partial Translation).
"Fast Sintering of Soft Mn-Zn and Ni-Zn Ferrite Pot Cores", Antoinette Morell et al, American Ceramic Society Bulletin, vol. 59, No. 6, 1980, Columbus, Ohio, pp. 62662-62629.
"Soft Ferrites" by Sadataro Hiraga, Bulletin of the Japan Institute of Metals, vol. 24, No. 4 (1985) p. 288 (partial translation and copy of the Japanese reference indicating the translated part).
Fujiwara Kouzou
Narutani Tetsu
Okuno Keizou
Okutani Katsunobu
Yamazaki Masakatsu
Derrington James
Kawasaki Steel Corporation
Miller Austin R.
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