Low cobalt hard facing alloy
US-2017218491-A1 · Aug 3, 2017 · US
Iron-based sintered alloy and method for producing the same
US11891682B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11891682-B2 |
| Application number | US-202016922373-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 7, 2020 |
| Priority date | Jun 24, 2015 |
| Publication date | Feb 6, 2024 |
| Grant date | Feb 6, 2024 |
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Abstract
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An iron-based sintered alloy, which has a composition including, in terms of percent by mass, Ti: 18.4 to 24.6%, Mo: 2.8 to 6.6%, C: 4.7 to 7.0%, Cr: 7.5 to 10.0%, Ni: 4.5 to 6.5%, Co: 1.5 to 4.5%, Al: 0.6 to 1.0%, the balance being Fe and unavoidable impurities, wherein the alloy has a structure in which hard particles are dispersed in an island form in a matrix, among other characteristics.
First claim
Opening claim text (preview).
What is claimed is: 1. An iron-based sintered alloy which is used in a die and a cutter blade for a pelletizer of a resin extruder, the iron-based sintered alloy having a composition comprising, in terms of percent by mass, Ti: 18.4 to 24.6%, Mo: 2.8 to 6.6%, C: 4.7 to 7.0%, Cr: 7.5 to 10.0%, Ni: 4.5 to 6.5%, Co: 1.5 to 4.5%, Al: 0.6 to 1.0%, the balance being Fe and unavoidable impurities, and the iron-based sintered alloy having a structure in which hard particles are dispersed in a matrix, wherein a coefficient of friction after passing through a conforming stage is 0.12 or less in a friction test in water by a cutter blade-on-disk method simulating a die and a cutter blade, the maximum circle equivalent diameter of the hard particles is a predetermined value of 26.77 μm to 10 μm, and the hard particles have a fine and relatively uniform shape and are homogenously dispersed over the whole matrix. 2. An iron-based sintered alloy that is used in sliding components in pairs, the iron-based sintered alloy having a composition comprising, in terms of percent by mass, Ti: 18.4 to 24.6%, Mo: 2.8 to 6.6%, C: 4.7 to 7.0%, Cr: 7.5 to 10.0%, Ni: 4.5 to 6.5%, Co: 1.5 to 4.5%, Al: 0.6 to 1.0%, the balance being Fe and unavoidable impurities, wherein the alloy has a structure in which hard particles are dispersed in a matrix, an area ratio of the hard particles is 38% to 41% and standard deviation of the area ratio of the hard particles is 2.5 to 3.5, and a maximum circle equivalent diameter of the hard particles is a predetermined value of 26.77 μm to 10 μm, and the hard particles have a fine and relatively uniform shape and are homogenously dispersed over the whole matrix. 3. The iron-based sintered alloy according to claim 2 , wherein the hard particles are formed from a titanium carbide, a Mo carbide or a composite carbide of titanium and molybdenum. 4. The iron-based sintered alloy according to claim 2 , wherein the components used in pairs are components to be used as a die and a cutter blade. 5. The iron-based sintered alloy according to claim 2 , wherein a coefficient of friction after passing through a conforming stage is 0.12 or less in a friction test in water by a cutter blade-on-disk method simulating a die and a cutter blade. 6. The iron-based sintered alloy according to claim 2 , wherein standard deviation of the maximum circle equivalent diameter is 6 μm to 4 μm.
Assignees
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Classifications
Processes characterised by the sequence of their steps · CPC title
Micron size particles, i.e. above 1 micrometer up to 500 micrometer · CPC title
Carbide · CPC title
Iron · CPC title
Use of vacuum · CPC title
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- What does patent US11891682B2 cover?
- An iron-based sintered alloy, which has a composition including, in terms of percent by mass, Ti: 18.4 to 24.6%, Mo: 2.8 to 6.6%, C: 4.7 to 7.0%, Cr: 7.5 to 10.0%, Ni: 4.5 to 6.5%, Co: 1.5 to 4.5%, Al: 0.6 to 1.0%, the balance being Fe and unavoidable impurities, wherein the alloy has a structure in which hard particles are dispersed in an island form in a matrix, among other characteristics.
- Who is the assignee on this patent?
- Japan Steel Works Ltd
- What technology area does this patent fall under?
- Primary CPC classification C22C38/56. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Feb 06 2024 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).