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-11015236-B2
Application number	US-201816140868-A
Country	US
Kind code	B2
Filing date	Sep 25, 2018
Priority date	Nov 8, 2017
Publication date	May 25, 2021
Grant date	May 25, 2021

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

What is claimed is:

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 the 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, the metallic phase consisting by weight of at least 40% of iron, from 25% 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 w&% 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 25% 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 consisting of Cr 3 C 2 , 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. The moulding composition according to claim 1 , wherein the ceramic phase consists by weight of 50% to 90% of a principal ceramic phase based on ceramic selected from the group consisting of TiC, TiCN, TiN, and mixtures thereof, and from 10 to 50% of at least one secondary ceramic phase selected from the group consisting of NbC, TaC, and mixtures thereof.

19. 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.

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

21. The method based on powder metallurgy for manufacturing an article in sintered massive cermet according to claim 19 , wherein said article is an element of a clock or watch movement.

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

• C22C29/04

  based on carbonitrides · CPC title

• G04B45/0076

  Decoration of the case and of parts thereof, e.g. as a method of manufacture thereof (specially shaped G04B45/0061, G04B45/0069; decoration with inscriptions and pictures G04B45/0084; construction of the hands G04B19/042; decoration by adding extra pieces to the clockwork G04B47/04; colouring by treatment of the surface, e.g. by oxidation C25D) · CPC title

• C22C33/0292

  with more than 5% preformed carbides, nitrides or borides · CPC title

• C22C29/16

  based on nitrides {(containing cubic BN or wurtzitic BN and diamond C22C26/00)} · CPC title