Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Making composite or hollow article
Patent
1991-07-02
1992-09-01
Lechert, Jr., Stephen J.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Making composite or hollow article
419 23, 419 36, 419 37, 433207, 433208, G22F 700
Patent
active
051436922
ABSTRACT:
A method of making a substructure for a dental restoration which comprises a substructure of a dental metal and a fired on coating of a dental ceramics, which method comprises applying a powder-form mixture of a dental metal powder and a thermoplastic polymeric material having a melting point above 50.degree. C., in the shape of the dental restoration to be made, to a porous refractory model, by means of a heated instrument, heating the assembly so obtained to a temperature at which the thermoplastic polymeric material liquefies and is sucked from the coating into the model, followed by raising the temperature of the assembly to a temperature at which the thermoplastic polymeric material disappears, and raising the temperature further to a sintering temperature at which the dental metal powder is sintered into a solid metal mass. The substructure so formed can be provided with a fired on coating of dental ceramics.
REFERENCES:
patent: 4011291 (1977-03-01), Curry
patent: 4742861 (1988-05-01), Shoher et al.
patent: 4980124 (1990-12-01), Dimmer
Elephant Edelmetaal B.V.
Lechert Jr. Stephen J.
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