Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling heat transfer with molding material
Patent
1989-02-10
1991-09-24
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling heat transfer with molding material
264 56, 264125, 264332, 264570, 419 10, 419 49, 419 56, B29C 4310, C04B 3660
Patent
active
050512188
ABSTRACT:
A method for consolidating or densifying material selected from metal, ceramic or mixtures thereof to form a densified compact article, which process includes (a) arranging the sample to be consolidated or densified in a general configuration within a temperature controlled high pressure chamber completely surrounded by a pre-glass material which forms a glass at elevated temperature in close proximity and surrounded by a heating element within the pre-glass material and having at least one temperature measuring device in close proximity to the sample all located within a shell; (b) externally heating the arrangement produced in step (a) at an elevated temperature for a time effective to remove moisture, volatiles, impurities, volatile oxides or mixtures thereof; (c) heating the sample produced in step (c) to produce fusion of the pre-glass at between about 500.degree. to 1600.degree. C. to encapsulate the heating element; (d) using the encapsulated heating element, to locally heat the prearticle and sample to a temperature of between about 700.degree. and 2,200.degree. C., monitoring the sample temperature using the temperature measuring device, and simultaneously applying a pressure to the prearticle of between about 50,000 and 275,000 psi for a time effective to densify the material, wherein the external pressure chamber has a surface temperature in contact with the prearticle of not greater than 500.degree. C., and recovering the formed article. The brief localized heating makes it possible to use the high pressing pressures.
REFERENCES:
patent: 2648125 (1953-08-01), McKenna
patent: 4041123 (1977-08-01), Lange et al.
patent: 4227927 (1980-10-01), Black et al.
patent: 4443404 (1984-04-01), Tsuda et al.
patent: 4490139 (1984-12-01), Lee et al.
patent: 4524138 (1985-06-01), Schwetz et al.
patent: 4594104 (1986-06-01), Reybould
patent: 4596694 (1986-06-01), Rozmus
patent: 4632793 (1986-12-01), Ezis et al.
patent: 4656002 (1987-04-01), Lizenby et al.
patent: 4657822 (1987-04-01), Goldstein
patent: 4724123 (1988-02-01), Rozmus, Jr.
patent: 4732556 (1988-03-01), Chiang et al.
patent: 4738610 (1988-04-01), Chiang et al.
patent: 4744943 (1988-05-01), Timm
K. H. Rolle, "Powder Metallurgy," Kirk-Othmer: Encyclopedia of Chemical Technology, 3rd Ed., vol. 19, pp. 28-62 (1982).
Fiorilla Christopher A.
Silbaugh Jan H.
The Regents of the University of California
LandOfFree
Method for localized heating and isostatically pressing of glass does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for localized heating and isostatically pressing of glass, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for localized heating and isostatically pressing of glass will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1695189