Presinter treatment for iron powder article formed with boride a

Details Presinter treatment for iron powder article formed with boride a Presinter treatment for iron powder article formed with boride a

1989-04-17

1989-12-12

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Metal and nonmetal in final product

419 42, 419 45, 419 47, 419 53, 419 56, 75242, 75244, B22F 100

Patent

active

048866377

ABSTRACT:
A presinter treatment is provided to reduce oxygen contamination prior to sintering a predominantly iron powder compact comprising carbon powder and a liquating diffusible boron source, such as nickel boride powder optionally in combination with iron boride powder. A preferred treatment is carried out at a temperature effective to dissociate iron oxide within the compact but not to initiate a liquid phase by said boron source and further is carried out in a vacuum to evacuate oxygen released thereby from compact pores prior to sintering. The presinter treatment enhances carbon and boron diffusion into the iron during sintering. In a preferred embodiment, the fraction of borocementite particles formed by diffused carbon and boron in the sintered iron structure is increased by the presinter treatment of this invention.

REFERENCES:
patent: 3937630 (1976-02-01), Kimura et al.
patent: 4618473 (1980-10-01), Jandeska, Jr.
patent: 4678510 (1987-07-01), Jandeska, Jr. et al.
patent: 4704251 (1987-11-01), Kremer

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