Three-dimensional screen printing method, component producible by means of said method, and screen printing mask

Patent metadata

Field	Value
Publication number	US-2023321721-A1
Application number	US-202118012014-A
Country	US
Kind code	A1
Filing date	Jun 28, 2021
Priority date	Jun 30, 2020
Publication date	Oct 12, 2023
Grant date	—

Abstract

The invention relates to a three-dimensional screen printing method for producing a green part from printing material for a powder metallurgical component, wherein the printing material contains a fraction of powder, more particularly metal powder or ceramic powder, and binder or consists of these materials, characterized in that a screen printing mask has a screen printing structure having openings for pressing the printing material through, the openings being partly undulate so that the green part at least partly has a three-dimensional undulate structure and/or undulate edges.

First claim

1 . A three-dimensional screenprinting method for production of a green part from print material for a powder metallurgy component, wherein the print material includes a portion of powder, especially metal powder or ceramic powder, and binder or consists of said materials,
wherein a screenprinting mask has a screenprinting structure with openings for the print material to be pushed through, wherein the openings are partly wave-shaped, such that the green part has an at least partial three-dimensional wavy structure and/or wavy edges.

2 . The three-dimensional screenprinting method for production of a green part from print material for a powder metallurgy component, especially also as claimed in claim 1 , wherein the print material includes a portion of powder, especially metal powder or ceramic powder, and binder or consists of said materials,
wherein the green part after production is shaped at temperatures between 30 and 100° C., especially the 90° C., very particularly between 30 and 60° C., wherein the temperature especially remains constant and/or the shaping is effected by means of a mold, especially within a range from 1 to 30 seconds.

3 . The three-dimensional screenprinting method as claimed in claim 1 , wherein the wavy structure has the shape of a honeycomb or a rhombus.

4 . The three-dimensional screenprinting method as claimed in claim 1 , wherein the screenprinting structure has a multitude of wave-shaped openings that are arranged at least partly parallel to one another and which are especially at the same distance from one another and/or are arranged at least partly in phase with one another.

5 . The three-dimensional screenprinting method as claimed in claim 1 , wherein at least one wave-shaped opening of the screenprinted structure has a constant wavelength over its longitudinal extent, where the wavelength is especially greater than 50 μm and less than 5000 μm.

6 . The three-dimensional screenprinting method as claimed in claim 1 , wherein the width of at least one wave-shaped opening is greater than 50 μm and less than 5000 μm.

7 . The three-dimensional screenprinting method as claimed in claim 1 , wherein at least one wavy structure of the green part has a height of between 1 and 20 mm, especially between 2 and 10 mm, very particularly 5 mm.

8 . The three-dimensional screenprinting method as claimed in claim 1 , wherein at least one wave-shaped opening of the screenprinting mask and at least one wavy structure of the green part are at least partly in sinusoidal form in horizontal section.

9 . The three-dimensional screenprinting method as claimed in claim 1 , wherein the green part is shaped after production.

10 . The three-dimensional screenprinting method as claimed in claim 8 , wherein the shaping is effected about at least one axis of curvature.

11 . The three-dimensional screenprinting method as claimed in claim 9 , wherein the green part is shaped about two axes, especially in that the green part is shaped so as to cause a depression or a bulge.

12 . The three-dimensional screenprinting method as claimed in claim 9 , wherein the shaping results in extension and/or compression at least of parts of the wavy structure of the green, which is compensated for by adjusting the wavelength.

13 . The three-dimensional screenprinting method as claimed in claim 9 , wherein the unshaped green part is essentially cuboidal and the shaping of the green part comprises bending about an axis of curvature, wherein the axis of curvature is in a plane that lies parallel or at an incline relative to a lateral face of the green part.

14 . The three-dimensional screenprinting method as claimed in claim 1 , wherein the shaping is followed by debindering and sintering, especially under reduced pressure.

15 . The three-dimensional screenprinting method as claimed in claim 1 , wherein the metal powder used is a metal-containing metal powder, especially a CoNiCrAlY powder.

16 . The three-dimensional screenprinting method as claimed in claim 1 , wherein the green part is shaped at a pressure between 0.8 and 1.2 bar, especially at 1 bar.

17 . The three-dimensional screenprinting method as claimed in claim 1 , wherein the green part is shaped at a relative humidity between 60% and 100%, especially at a relative humidity between 80% and 100%.

18 . A component producible by a method as claimed in claim 1 .

19 . The component as claimed in claim 18 , wherein it takes the form of a sealing surface, especially of an abradable seal, in a turbo machine or of part of an abradable seal for a turbo machine.

20 . The component as claimed in claim 18 , wherein the component is at least partly in dish form or in conical form.

21 . The component as claimed in claim 18 , wherein a radius of curvature of the component is between 50 mm and 2000 mm, especially between 100 and 200 mm.

22 . A screenprinting mask for use in at least one of the screenprinting methods as claimed in claim 1 .

Assignees

• Rolls Royce Deutschland Ltd & Co Kg

Inventors

• Daenicke Enrico
• Hinze Björn
• Gäbler Miklos

Classifications

• B22F7/02 Primary

  of composite layers {(B22F7/002 takes precedence)} · CPC title

• B41F15/34

  Screens, Frames; Holders therefor · CPC title

• B22F10/10

  Formation of a green body · CPC title

• B22F3/1115

  comprising complex forms, e.g. honeycombs · CPC title

• B22F5/009

  of turbine components other than turbine blades (of turbine blades B22F5/04) · CPC title