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US5137565A Expired / Lapsed US ⏱️ 0.0 years remaining

Method of making an extremely fine-grained titanium-based carbonitride alloy

Assignee: Sandvik AB
•
Filing: 1991-12-17
•
Granted: 1992-08-11
•
Expires: 2011-12-17
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Abstract

Abstract According to the present invention there is now provided a method of making a sintered titanium-based carbonitride alloy. According to the method, melt-metallurgical raw materials containing the metallic alloying elements for hard constituent-forming as well as binder phase-forming elements are melted and cast, using no intentional additions of the elements C, N, B and O, to form a pre-alloy which in solidified condition of brittle intermetallic phases with hard constituent-forming and binder phase-forming elements mixed in atomic scale. The pre-alloy is crushed and/or milled to powder with grain size <50 μm. The powder is carbonitrided for simultaneous formation in situ of extremely fine-grained <0.1 μm, hard constituent particles enclosed in their binder phase. The obtained powder is milled together with lubricant and possible additions of powders of metals, carbides and/or nitrides from the groups IV, V or VI in the Periodic Table in order to obtain desired final analysis after which the powder is compacted and sintered.

Inventors

  • 👤 Anders G. Thelin
  • 👤 Rolf G. Oskarsson
  • 👤 Gerold Weinl

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 09:36
CPC Classifications
C; C22; C22C; C22C29/00; C22C29/02; C22C29/04; C22C1/00; C22C1/04; C22C1/05; C22C1/051; C22C1/053; C22C1/055; C22C1/056

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 93 words
A method of making a sintered titanium-based carbonitride alloy comprising casting a pre-alloy of hard constituent-forming and binder phase-forming metals without intentional additions of C, N, B, and/or O to form a cast pre-alloy of brittle intermetallic phases of hard constituent-forming metals and binder phase-forming metals mixed in atomic scale, mixed, forming a powder of a grain size <50 μm of the said pre-alloy, carbonitriding said powder to form in situ, extremely fine-grained hard constituent particles having a diameter ≦0.1 μm within the binder phase metals, compacting and sintering the said carbonitrided powders.
Claim 2
Independent Claim 93 words
A method of making a sintered titanium-based carbonitride alloy comprising casting a pre-alloy of hard constituent-forming and binder phase-forming metals without intentional additions of C, N, B, and/or O to form a cast pre-alloy of brittle intermetallic phases of hard constituent-forming metals and binder phase-forming metals mixed in atomic scale, mixed, forming a powder of a grain size <50 μm of the said pre-alloy, carbonitriding said powder to form in situ, extremely fine-grained hard constituent particles having a diameter ≦0.1 μm within the binder phase metals, compacting and sintering the said carbonitrided powders.
Claim 3
Dependent Claim 16 words
The method of claim 1 wherein the powder is formed with a grain size <30 μm.
Claim 4
Dependent Claim 40 words
The method of claim 1 wherein the powder after carbonitriding is mixed with powders of other metals, metal carbides, and/or metal nitrides, said metal being selected from the group consisting of groups IV, V or VI of the Periodic Table.
Claim 5
Dependent Claim 21 words
The method of claim 1 wherein the binder phase metal content of the said alloy is >5% and <20% by volume.
Claim 6
Dependent Claim 15 words
The method of claim 4 wherein the binder phase metal content is >7% and <18%.
Claim 7
Dependent Claim 15 words
The method of claim 5 wherein the binder phase metal content is >7% and <16%.
Claim 8
Dependent Claim 15 words
The method of claim 1 wherein the carbonitriding is performed at a temperature <1200° C.
Claim 9
Dependent Claim 15 words
The method of claim 7 wherein the carbonitriding is performed at a temperature <1100° C.
Claim 10
Dependent Claim 8 words
The product of the process of claim 1.

References Cited (Backward Citations)

US4894090A Cited
US5032174A Cited
US4783216A Cited
US4943322A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1995-08-11 1996-02-10 1996-08-11 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1999-08-11 2000-02-10 2000-08-11 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2003-08-11 2004-02-10 2004-08-11 $7700.00 Window Closed / Lapsed

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