Thermal shielding system

Patent metadata

Field	Value
Publication number	US-9803925-B2
Application number	US-201314654611-A
Country	US
Kind code	B2
Filing date	Dec 19, 2013
Priority date	Dec 20, 2012
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

A thermal shielding system for thermally shielding a batch space of high-temperature furnaces includes at least one shielding element. The shielding element has an encasing wall formed of refractory metal sheet(s) and a ceramic material accommodated in the wall. The ceramic material is present in a particulate and/or fibrous structure and it is based on zirconium oxide (ZrO 2 )

First claim

The invention claimed is:

1. A thermal shielding system for thermally shielding a batch space of high-temperature furnaces, the shielding system comprising:
at least one shielding element;
said shielding element having a encasement made of refractory sheet metal and a ceramic material accommodated in said encasement, said ceramic material having a particulate structure and/or a fibrous structure and being based on zirconium oxide (ZrO 2 ).

2. The thermal shielding system according to claim 1 , wherein said ceramic material is present as a bed of individual particles.

3. The thermal shielding system according to claim 2 , wherein said bed of individual particles has a monomodal grain distribution.

4. The thermal shielding system according to claim 1 , wherein said ceramic material consists of ≧80% by weight of zirconium oxide (ZrO 2 ).

5. The thermal shielding system according to claim 1 , wherein said refractory sheet metal is formed of ≧98% by weight from tungsten.

6. The thermal shielding system according to claim 1 , wherein said refractory sheet metal has a wall thickness d B where 0.25 mm ≦d B ≦2.5 mm.

7. The thermal shielding system according to claim 1 , wherein said shielding element has a thickness d E in a range of 8 mm ≦d E ≦120 mm.

8. The thermal shielding system according to claim 1 , which further comprises, in addition to said shielding element, a plurality of spaced-apart radiant plates made of refractory metal.

9. The thermal shielding system according to claim 8 , wherein said radiant plates are formed of a material selected from the group consisting of molybdenum, a molybdenum-based alloy, tungsten, and a tungsten-based alloy.

10. A high-temperature furnace, comprising:
a furnace body with a batch space for a thermal treatment of parts; and
a thermal shielding system according to claim 1 at least partially surrounding said batch space.

11. The high-temperature furnace according to claim 10 , wherein said thermal shielding system comprises a plurality of radiant plates made of refractory metal, which are spaced apart in a shielding direction and arranged adjacent said shielding element in the shielding direction.

12. The high-temperature furnace according to claim 11 , wherein said radiant plates are arranged on a distal side of said shielding element remote from said batch space.

13. The high-temperature furnace according to claim 11 , wherein a number of radiant plates arranged adjacent said shielding element in the shielding direction lies in a range from 1 to 7.

14. The high-temperature furnace according to claim 10 , which comprises at least one electrical heating element for heating said batch space, said electrical heating element being disposed inside said thermal shielding system.

15. The high-temperature furnace according to claim 10 , wherein at least one shielding element is in the form of a component which is removable from the high-temperature furnace in modular form.

Assignees

• Plansee Se

Inventors

• Grohs Christian
• Huber Karl
• Plankensteiner Arno
• Raggl Karl
• Valentini Bernhard

Classifications

• C21D9/00

  Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor · CPC title

• F27B5/08

  Arrangements of linings · CPC title

• F27D1/02

  Crowns; Roofs · CPC title

• F27B1/14

  Arrangements of linings · CPC title

• F27B3/12

  Working chambers or casings; Supports therefor · CPC title