Refractory molded body, compounds, binders, and method for producing same

Patent metadata

Field	Value
Publication number	US-10870605-B2
Application number	US-201616063044-A
Country	US
Kind code	B2
Filing date	Jul 29, 2016
Priority date	Jan 4, 2016
Publication date	Dec 22, 2020
Grant date	Dec 22, 2020

Abstract

The present invention relates to a compound for making high-temperature-resistant or refractory molded bodies, made up of a mixture of:
a refractory or high-temperature-resistant inorganic powder, granules and/or granulate, including a free-flowing compound or a powder made of carbon or also without carbon, a binder,

the binder being made of a combination of tannin, lactose, fine-grained silica and aluminum powder, as well as the binder itself, and molded bodies produced from the compound including the binder, and a method of making same.

First claim

What is claimed is:

1. A compound for making high-temperature-resistant or refractory molded bodies, the compound including a mixture of:
a refractory or high-temperature-resistant inorganic powder, granules and/or granulate, and
a binder made of a combination of tannin, lactose, fine-grained silica and aluminum powder.

2. The compound defined in claim 1 , wherein a proportion of the binder of up to 50 wt. % is added to the compound.

3. The compound defined in claim 1 , wherein the ratio of lactose to tannin is between 0.1:1 and 0.3:1.

4. The compound defined in claim 1 , wherein the fine-grained silica has a particle size smaller than 50 μm.

5. The compound defined in claim 1 , wherein phenolic resin in powder form of up to 30 wt. % based on the mixture of lactose and tannin is added to the binder.

6. The compound defined in claim 1 , wherein further fine-grained additives are added to the binder, namely SiC, B 4 C, TiC, Si 3 N 4 , AIN, TiN, or borides.

7. The compound defined in claim 1 , wherein doped silicon is added to the binder.

8. The compound defined in claim 1 , wherein ethylene glycol is added to the binder in an amount of 0.1 to 5 wt %.

9. The compound defined in claim 1 , wherein the proportion of tannin is greater than the proportion of lactose.

10. The compound defined in claim 1 , wherein the carbon is graphite and/or carbon black and/or carbon fiber material and/or carbon nanotubes (CNTs) and/or graphene and/or carbonized pitch, bitumen or phenolic resin.

11. A compound for making high-temperature-resistant or refractory molded bodies, the compound including a mixture of:
a refractory or high-temperature-resistant inorganic powder, granules and/or granulate,
a free-flowing compound or a powder made of carbon, and
a binder made of a combination of tannin, lactose, fine-grained silica and aluminum powder.

12. The compound defined in claim 11 , wherein the ratio of lactose to tannin is between 0.1:1 and 0.3:1.

13. The compound defined in claim 11 , wherein the fine-grained silica has a particle size smaller than 50 μm.

14. The compound defined in claim 11 , wherein phenolic resin in powder form of up to 30 wt. % based on the mixture of lactose and tannin is added to the binder.

15. The compound defined in claim 11 , wherein further fine-grained additives are added to the binder, namely SiC, B 4 C, TiC, Si 3 N 4 , AIN, TiN, or borides.

16. The compound defined in claim 11 , wherein doped silicon is added to the binder.

17. The compound defined in claim 11 , wherein ethylene glycol is added to the binder in an amount of 0.1 to 5 wt %.

18. The compound defined in claim 11 , wherein the proportion of tannin is greater than the proportion of lactose.

19. The compound defined in claim 11 , wherein the carbon is graphite and/or carbon black and/or carbon fiber material and/or carbon nanotubes (CNTs) and/or graphene and/or carbonized pitch, bitumen or phenolic resin.

20. A method of making refractory or high-temperature-resistant molded bodies or compounds including a high-temperature-resistant or refractory inorganic powder, granules and/or granulate and a binder, the method comprising the steps of:
adding at least one inorganic coarse granulation of >100 μm and carbon having a combined binder based on tannin, lactose, fine-grained silica and aluminum powder to an inorganic fine granulation of <100 μm to form a mixture;
transforming the mixture via a primary shaping method into a product; and
treating the product thermally before or during use at temperatures greater than 100° C. while excluding oxygen.

Assignees

• Magnesita Refractories Gmbh
• Refractory Intellectual Property Gmbh & Co Kg

Inventors

• Gueguen Erwan
• Aneziris Christos G
• Biermann Christiane
• Ducastel Antoine

Classifications

• C04B2235/3843

  Titanium carbides · CPC title

• C04B2235/65

  Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes · CPC title

• C04B2235/3852

  Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride · CPC title

• C04B35/6268

  characterised by the applied pressure or type of atmosphere, e.g. in vacuum, hydrogen or a specific oxygen pressure · CPC title

• C04B2235/658

  Atmosphere during thermal treatment · CPC title