Process for producing electrically-conductive articles from silicon powder by treatment in the presence of boron oxide
AssigneeHolec N.V.
InventorsAntoon H. M. Kipperman, Lambertus E. H. Habraken
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Abstract
A process for the preparation of shaped, electrically conductive articles from silicon powder by sintering the powder while it is being pressed or sedimented in a mould at a temperature of 1150.degree.-1250.degree. C. in an inert atmosphere and in the presence of boron oxide, optionally followed by adding a further amount of boron into the sintered shaped article. The boron oxide, which is used in an amount of 0.1-11% by weight, based on the silicon powder, can be added in the form of an aqueous solution.
Claims5
A process for producing a shaped, electrically-conductive silicon-containing article which comprises the steps of
- (a) coating particles of a silicon powder with boron oxide,
- (b) moulding at an elevated pressure the coated particles of silicon powder from step (a) into an intermediate article of the desired shape, and
- (c) sintering the shaped article of step (b) in an inert atmosphere by heating the shaped article to between 450.degree. and 550.degree. C. and maintaining this temperature for between 0.5 and 2 hours, then heating the shaped article to between 1150.degree. and 1250.degree. C. and maintaining this temperature for between 1 and 2 hours and finally subjecting the shaped article to a temperature which is between 200.degree. and 300.degree. C. less than the last-mentioned temperature range and maintaining this temperature for up to 24 hours to form the desired shape, electrically-conductive silicon-containing article.
A process for producing a shaped, electrically-conductive silicon-containing article which comprises the steps of
- (a) coating particles of a silicon powder with boron oxide,
- (b) moulding the coated particles of silicon powder from step (a) into an intermediate article of the desired shape,
- (c) sintering the shaped article of step (b) at a temperature of 1150.degree. to 1250.degree. C. in an inert atmosphere to form the desired shaped, electrically-conductive silicon-containing article,
- (d) treating the shaped article of step (c) with an aqueous solution of boron oxide,
- (e) drying the shaped article of step (d),
- (f) heating the shaped article of step (e) to between 450.degree. and 550.degree. C. and maintaining this temperature for between 0.5 and 2 hours, and
- (g) heating the shaped article of step (f) to between 1200.degree. and 1250.degree. C. and maintaining this temperature for between 1 and 2 hours.
Dependencies are inferred from the claim text.