Powder metallurgy moulding composition notably intended for manufacturing decorative or covering articles in sintered massive cermet and said decorative or covering articles in sintered massive cermet

Patent metadata

Field	Value
Publication number	US-2019136352-A1
Application number	US-201816140868-A
Country	US
Kind code	A1
Filing date	Sep 25, 2018
Priority date	Nov 8, 2017
Publication date	May 9, 2019
Grant date	—

Abstract

A powder metallurgy moulding composition intended for manufacturing decorative or covering articles in sintered massive cermet, including an inorganic powder to form the cermet and an organic binder. The inorganic powder includes by weight of 35% to 95% of at least one ceramic phase based on ceramic selected from the group consisting of TiC, TiCN, TiN and mixtures thereof, and from 5% to 65% of a metallic phase, the metallic phase consisting by weight of at least 40% of iron, from 15% to 45% of chromium, from 0.1% to 25% of molybdenum, from 0.1% to 10% of silicon, from 0 to 10% of boron, and from 0 to 10% of niobium, the respective amounts of the elements of the metallic phase being such that their sum is equal to 100 wt % of the metallic phase.

First claim

1 . A powder metallurgy moulding composition intended for manufacturing articles in sintered massive cermet, comprising an inorganic powder intended to form the cermet and an organic binder, wherein said inorganic powder consists by weight of 35% to 95% of at least one ceramic phase based on ceramic selected from the group consisting of TiC, TiCN, TiN and mixtures thereof, and from 5% to 65% of a metallic phase, said metallic phase consisting by weight of at least 40% of iron, from 15% to 45% of chromium, from 0.1% to 25% of molybdenum, from 0.1% to 10% of silicon, from 0 to 10% of boron, and from 0 to 10% of niobium, the respective amounts of the elements of the metallic phase being such that their sum is equal to 100 wt % of the metallic phase.

2 . The moulding composition according to claim 1 , wherein the metallic phase comprises by weight from 40% to 70% of iron.

3 . The moulding composition according to claim 2 , wherein the metallic phase comprises by weight from 45% to 60% of iron.

4 . The moulding composition according to claim 1 , wherein the metallic phase comprises by weight from 20% to 40% of chromium.

5 . The moulding composition according to claim 4 , wherein the metallic phase comprises by weight from 25% to 35% of chromium.

6 . The moulding composition according to claim 1 , wherein the metallic phase comprises by weight from 1% to 20% of molybdenum.

7 . The moulding composition according to claim 6 , wherein the metallic phase comprises by weight from 5% to 10% of molybdenum.

8 . The moulding composition according to claim 1 , wherein the metallic phase comprises by weight from 1% to 10% of silicon.

9 . The moulding composition according to claim 8 , wherein the metallic phase comprises by weight from 2% to 8% of silicon.

10 . The moulding composition according to claim 1 , wherein the metallic phase comprises by weight from 0% to 5% of boron.

11 . The moulding composition according to claim 10 , wherein the metallic phase comprises by weight from 0% to 1% of boron.

12 . The moulding composition according to claim 1 , wherein the metallic phase comprises by weight from 0% to 8% of niobium.

13 . The moulding composition according to claim 12 , wherein the metallic phase comprises by weight from 0% to 5% of niobium.

14 . The moulding composition according to claim 1 , wherein the ceramic phase consists by weight of 50% to 100% of a principal ceramic phase based on ceramic selected from the group consisting of TiC, TiCN, TiN, and mixtures thereof, and from 0 to 50% of at least one secondary ceramic phase selected from the group comprising Cr3C2, CrN, NbC, NbN, TaC, TaN, and mixtures thereof.

15 . The moulding composition according to claim 1 , wherein said inorganic powder consists by weight of 50% to 90% of the ceramic phase and from 10% to 50% of the metallic phase.

16 . The moulding composition according to claim 15 , wherein said inorganic powder consists by weight of 65% to 85% of the ceramic phase and from 15% to 35% of the metallic phase.

17 . The moulding composition according to claim 1 , wherein it comprises by weight from 76% to 96% of inorganic powder and from 4% to 24% of organic binder.

18 . A method based on powder metallurgy for manufacturing an article in sintered massive cermet comprising a step of preparing a moulding composition according to claim 1 , a step of moulding said moulding composition for making a green compact of the article, and then steps of binder removal and sintering to obtain said article in sintered massive cermet.

19 . The method based on powder metallurgy for manufacturing an article in sintered massive cermet according to claim 18 , wherein said article is a decorative or covering article.

20 . The method based on powder metallurgy for manufacturing an article in sintered massive cermet according to claim 18 , wherein said article is an element of a clock or watch movement.

21 . A decorative or covering article in sintered massive cermet, wherein said sintered massive cermet is obtained from an inorganic powder consisting by weight of 35% to 95% of at least one ceramic phase based on ceramic selected from the group consisting of TiC, TiCN, TiN and mixtures thereof, and from 5% to 65% of a metallic phase, said metallic phase consisting by weight of at least 40% of iron, from 15% to 45% of chromium, from 0.1% to 25% of molybdenum, from 0.1% to 10% of silicon, from 0 to 10% of boron, and from 0 to 10% of niobium, the respective amounts of the elements of the metallic phase being such that their sum is equal to 100 wt % of the metallic phase.

22 . An element of a clock or watch movement made of sintered massive cermet, wherein said sintered massive cermet is obtained from an inorganic powder consisting by weight of 35% to 95% of at least one ceramic phase based on ceramic selected from the group consisting of TiC, TiCN, TiN and mixtures thereof, and from 5% to 65% of a metallic phase, said metallic phase consisting by weight of at least 40% of iron, from 15% to 45% of chromium, from 0.1% to 25% of molybdenum, from 0.1% to 10% of silicon, from 0 to 10% of boron, and from 0 to 10% of niobium, the respective amounts of the elements of the metallic phase being such that their sum is equal to 100 wt % of the metallic phase.

Assignees

• Swatch Group Res & Dev Ltd

Inventors

• Bertheville Bernard
• Fallet Yann
• Kubarsepp Jakob
• Kolnes Mart
• Kollo Lauri

Classifications

• B22F1/10

  Metallic powder containing lubricating or binding agents; Metallic powder containing organic material · CPC title

• B22F1/0059

  Operations & Transport · mapped topic

• B22F5/00

  Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product · CPC title

• B22F2301/35

  Iron · CPC title

• B22F2302/10

  Carbide · CPC title