US3713788A — Powder metallurgy sintered corrosion and heat-res…

Claim 1

Independent Claim 106 words

A powder metallurgy sintered age hardenable corrosion and heat resistant nickel-chromium refractory carbide alloy comprising by volume about 30 to 75 percent of primary grains of at least one refractory carbide selected from the group consisting of TiC, CbC, VC and TaC dispersed through a nickel-chromium matrix alloy makIng up the balance, said matrix alloy consisting essentially by weight of about 5 to 30 percent chromium, up to about 15 percent iron, about 0.5 to 5 percent titanium, about 0.2 to 5 percent aluminum, up to about 25 percent cobalt, up to about 0.5 percent carbon and the balance essentially at least about 40 percent nickel.

Claim 2

Dependent Claim 106 words

A powder metallurgy sintered age hardenable corrosion and heat resistant nickel-chromium refractory carbide alloy comprising by volume about 30 to 75 percent of primary grains of at least one refractory carbide selected from the group consisting of TiC, CbC, VC and TaC dispersed through a nickel-chromium matrix alloy makIng up the balance, said matrix alloy consisting essentially by weight of about 5 to 30 percent chromium, up to about 15 percent iron, about 0.5 to 5 percent titanium, about 0.2 to 5 percent aluminum, up to about 25 percent cobalt, up to about 0.5 percent carbon and the balance essentially at least about 40 percent nickel.

Claim 3

Dependent Claim 91 words

The sintered and age hardenable, corrosion and heat resistant nickel-chromium refractory carbide alloy of claim 1, wherein the refractory carbide ranges by volume from about 35 to 55 percent TiC, and wherein the matrix alloy making up substantially the balance consists essentially by weight of about 10 to 25 percent chromium, about 2 to 12 percent iron, about 1 to 3 percent titanium, about 0.5 to 2 percent aluminum, up to about 15 percent cobalt, up to about 0.25 percent carbon and the balance essentially at least about 50 percent nickel.

Claim 4

Dependent Claim 57 words

The sintered and age hardenable corrosion and heat resistant nickel-chromium alloy of claim 2, wherein the TiC by volume is about 45 percent and the balance is essentially the matrix alloy consisting essentially by weight of about 18 percent chromium, about 8 percent iron, about 2 percent titanium, about 1 percent aluminum and the balance essentially nickel.

Claim 5

Dependent Claim 128 words

As an article of manufacture, a heat resistant element of the class including heat resistant dies and machine parts formed of an age hardened powder metallurgy sintered corrosion and heat resistant nickel-chromium refractory carbide alloy comprising by volume about 30 to 75 percent of primary grains of at least one refractory carbide selected from the group consisting of TiC, CbC, VC and TaC dispersed through an age hardened nickel-chromium matrix alloy making up the balance, the matrix alloy consisting essentially by weight about 5 to 30 percent chromium, up to about 15 percent iron, about 0.5 to 5 percent titanium, about 0.2 to 5 percent aluminum, up to about 25 percent cobalt, up to about 0.5 percent carbon and the balance essentially at least about 40 percent nickel.

Claim 6

Dependent Claim 128 words

As an article of manufacture, a heat resistant element of the class including heat resistant dies and machine parts formed of an age hardened powder metallurgy sintered corrosion and heat resistant nickel-chromium refractory carbide alloy comprising by volume about 30 to 75 percent of primary grains of at least one refractory carbide selected from the group consisting of TiC, CbC, VC and TaC dispersed through an age hardened nickel-chromium matrix alloy making up the balance, the matrix alloy consisting essentially by weight about 5 to 30 percent chromium, up to about 15 percent iron, about 0.5 to 5 percent titanium, about 0.2 to 5 percent aluminum, up to about 25 percent cobalt, up to about 0.5 percent carbon and the balance essentially at least about 40 percent nickel.

Claim 7

Dependent Claim 85 words

The age hardened sintered refractory carbide article of manufacture of claim 4, wherein the refractory carbide ranges by volume from about 35 to 55 percent TiC, and wherein the matrix alloy making up substantially the balance consists essentially by weight of about 10 to 25 percent chromium, about 2 to 12 percent iron, about 1 to 3 percent titanium, about 0.5 to 2 percent aluminum, up to about 15 percent cobalt, up to about 0.25 percent carbon, and the balance essentially about 50 percent nickel.

Claim 8

Dependent Claim 54 words

The age hardened sintered refractory carbide article of manufacture of claim 5, wherein the TiC by volume is 45 percent and the balance is essentially the matrix alloy consisting essentially by weight of about 18 percent chromium, about 8 percent iron, about 2 percent titanium, about 1 percent aluminum and the balance essentially nickel.

Claim 9

Independent Claim 202 words

A method of producing by powder metallurgy a sintered, age hardenable, corrosion and heat resistant nickel-chromium refractory carbide alloy which comprises, providing a powder composition containing about 30 to 75 percent by volume of at least one refractory carbide selected from the group consisting of TiC, CbC, VC and TaC mixed with a powder formulation of alloy-forming ingredients to form an alloy matrix making up the balance containing about 5 to 30 percent chromium, up to about 15 percent iron, about 0.5 to 5 percent titanium, about 0.2 to 5 percent aluminum, up to about 25 percent cobalt, up to about 0.5 percent carbon and the balance essentially at least about 40 percent nickel, the aluminUm in the powder mixture being in the form of NiAl to assure recovery of the aluminum in the alloy matrix, forming the powder mixture into a compact, heating said compact to a liquid phase sintering temperature in vacuum ranging up to about 100* C above the melting point of the alloy matrix, cooling said sintered refractory carbide alloy through the liquidus-solidus region of the alloy at a rate not exceeding 35*C per hour, and thereafter cooling to room temperature at a rate not exceeding about 100*C.

Claim 10

Independent Claim 202 words

A method of producing by powder metallurgy a sintered, age hardenable, corrosion and heat resistant nickel-chromium refractory carbide alloy which comprises, providing a powder composition containing about 30 to 75 percent by volume of at least one refractory carbide selected from the group consisting of TiC, CbC, VC and TaC mixed with a powder formulation of alloy-forming ingredients to form an alloy matrix making up the balance containing about 5 to 30 percent chromium, up to about 15 percent iron, about 0.5 to 5 percent titanium, about 0.2 to 5 percent aluminum, up to about 25 percent cobalt, up to about 0.5 percent carbon and the balance essentially at least about 40 percent nickel, the aluminUm in the powder mixture being in the form of NiAl to assure recovery of the aluminum in the alloy matrix, forming the powder mixture into a compact, heating said compact to a liquid phase sintering temperature in vacuum ranging up to about 100* C above the melting point of the alloy matrix, cooling said sintered refractory carbide alloy through the liquidus-solidus region of the alloy at a rate not exceeding 35*C per hour, and thereafter cooling to room temperature at a rate not exceeding about 100*C.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1976-01-30	1976-07-31	1977-01-30	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1980-01-30	1980-07-31	1981-01-30	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1984-01-30	1984-07-31	1985-01-30	$7700.00	Window Closed / Lapsed

Powder metallurgy sintered corrosion and heat-resistant, age hardenable nickel-chromium refractory carbide alloy

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