Process for making composite containing fibrous material
AssigneeGeneral Electric Company
InventorRaj M. Singh
Life of this patent
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Abstract
A composite is produced by forming tapes comprised of a mixture of infiltration-promoting material and organic binding material, disposing a layer of boron nitride coated fibrous material between at least two of the tapes forming a layered structure, laminating the layered structure, heating the layered structure to remove organic binding material and infiltrating the resulting porous body with a solution of boron and silicon.
Claims34
A process for producing a composite containing at least about 10% by volume of boron nitride coated fibrous material and having a porosity of less than about 20% by volume which comprises the following steps:
- (a) forming tapes comprised of a mixture of infiltration-promoting material and organic binding material;
- (b) depositing a coating of boron nitride on fibrous material leaving no significant portion thereof exposed;
- (c) depositing a silicon-wettable coating on said boron nitride-coated fibrous material leaving no significant portion of said boron nitride exposed;
- (d) disposing a layer of the resulting coated fibrous material between the faces of two of said tapes forming a layered structure;
- (e) laminating the layered structure to form a laminated structure;
- (f) heating said laminated structure to remove said organic binding material leaving no significant deleterious residue producing a porous body;
- (g) infiltrating a molten infiltrant comprised of boron and silicon into said porous body to produce an infiltrated product, said molten infiltrant containing boron in solution in an amount ranging from about 0.1% by weight of silicon to an amount which forms a saturated solution with silicon;
- and
- (h) cooling said infiltrated product producing said composite.
A process for producing a composite containing at least about 10% by volume of boron nitride coated fibrous material and having a porosity of less than about 10% by volume which comprises the following steps:
- (a) forming tapes comprised of a mixture of infiltration-promoting material and organic binding material;
- (b) depositing a coating of boron nitride on fibrous material leaving no significant portion thereof exposed;
- (c) depositing a silicon-wettable coating on said boron nitride-coated fibrous material leaving no significant portion of said boron nitride exposed;
- (d) disposing a layer of the resulting coated fibrous material between the faces of two of said tapes forming a layered structure;
- (e) laminating the layered structure to form a laminated structure;
- (f) heating said laminated structure to remove said organic binding material leaving no significant deleterious residue producing a porous body;
- (g) providing an infiltrant composition comprised of boron and silicon;
- (h) contacting said porous body and said infiltrant composition;
- (i) heating the resulting assembly in a partial vacuum to a temperature at which said infiltrant composition is molten whereby molten infiltrant containing boron in solution in silicon in an amount ranging from about 0.1% by weight of silicon to a saturated solution of boron in silicon is infiltrated into said porous body;
- and
- (j) cooling said infiltrated product producing said composite.
A process for producing a composite containing at least about 10% by volume of boron nitride coated filaments and having a porosity of less than about 10% by volume which comprises the following steps:
- (a) forming tapes comprised of a mixture of infiltration-promoting material and organic binding material;
- (b) depositing a coating of boron nitride on filaments leaving no significant portion thereof exposed, each said filament having a diameter of at least about 50 microns and a length of at least about 10 times its diameter;
- (c) disposing a layer of said coated filaments between the faces of two of said tapes forming a layered structure, said filaments in said layer being spaced from each other;
- (d) laminating the layered structure to form a laminated structure;
- (e) heating said laminated structure to remove said organic binding material leaving no significant deleterious residue producing a porous body;
- (f) infiltrating a molten infiltrant comprised of boron and silicon into said porous body to produce an infiltrated product, said molten infiltrant containing boron in solution in an amount ranging from about 0.1% by weight of silicon an amount which forms a saturated solution with silicon;
- and
- (g) cooling said infiltrated product producing said composite.
A process for producing a composite containing at least about 10% by volume of boron nitride coated fibrous material and having a porosity of less than about 10% by volume which comprises the following steps:
- (a) forming tapes comprised of a mixture of infiltration-promoting material and organic binding material;
- (b) depositing a coating of boron nitride on filaments leaving no significant portion thereof exposed, each said filament having a diameter of at least about 50 microns and a length of at least about 10 times its diameter;
- (c) disposing a layer of said coated filaments between the faces of two of said tapes forming a layered structure, said filaments in said layer being spaced from each other;
- (d) laminating the layered structure to form a laminated structure;
- (e) heating said laminated structure to remove said organic binding material leaving no significant deleterious residue producing a porous body;
- (f) providing an infiltrant comprised of boron and silicon containing elemental boron in solution in an amount ranging from about 0.1% by weight of elemental silicon to an amount which forms a saturated solution with silicon;
- (g) contacting said porous body and said infiltrant with infiltrating means whereby molten infiltrant is infiltrated into said porous body;
- (h) heating the resulting assembly in a partial vacuum to a temperature at which said infiltrant is molten and infiltrating said molten infiltrant into said porous body to produce an infiltrated product;
- and
- (i) cooling said infiltrated product producing said composite.
Dependencies are inferred from the claim text.