Glass-melting component

Patent metadata

Field	Value
Publication number	US-11072553-B2
Application number	US-201716088164-A
Country	US
Kind code	B2
Filing date	Mar 23, 2017
Priority date	Mar 25, 2016
Publication date	Jul 27, 2021
Grant date	Jul 27, 2021

Abstract

A process for producing a glass melting component composed of refractory metal. A surface zone of the glass melting component is densified at least in sections by application of local compressive stress. As a result the surface zone has its porosity reduced compared to a volume section which is located underneath the surface zone and which has residual porosity.

First claim

The invention claimed is:

1. A glass melting component composed of refractory metal, the component comprising:
a surface zone and a volume section underneath said surface zone;
said surface zone being, at least in sections, densified and having a reduced porosity relative to a residual porosity of said volume section underneath said surface zone;
said surface zone and said volume section being composed of the refractory metal; and
said surface zone having a coarser grain structure than said volume section of the glass melting component;
wherein an average grain size in said surface zone lies in a range from 40 μm to 1000 μm.

2. The glass melting component according to claim 1 , being a glass melting component produced by a powder-metallurgical process.

3. The glass melting component according to claim 1 , wherein the porosity of said surface zone is not more than 1%.

4. The glass melting component according to claim 1 , wherein the porosity of said surface zone is at least 1.5 percentage points lower than the porosity of said underlying volume section.

5. The glass melting component according to claim 1 , wherein said surface zone has a depth in the range from 50 μm to 1000 μm.

6. The glass melting component according to claim 1 , wherein a surface of said surface zone has a roughness Ra of less than 0.30 μm.

7. The glass melting component according to claim 1 , wherein the glass melting component is a crucible.

8. The glass melting component according to claim 1 , wherein the glass melting component is a glass melting electrode.

9. The glass melting component according to claim 1 , comprising an interior wall and an outer wall each having a respective said densified surface zone.

Assignees

• Plansee Se

Inventors

• Traxler Hannes
• Mark Michael
• Schiftner Robert
• Knabl Wolfram

Classifications

• B22F2207/17

  density or porosity gradients · CPC title

• C21D7/06

  by shot-peening or the like · CPC title

• C03B5/425 Primary

  Preventing corrosion or erosion (C03B5/44 takes precedence) · CPC title

• C03B5/1672

  Use of materials therefor · CPC title

• B22F5/007

  of moulds · CPC title