REFRACTORY MOLDED BODY, COMPOUNDS, BINDERS, AND METHOD FOR PRODUCING SAME

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.

Claims

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. 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.

3. A binder for making refractory compounds or molded bodies the binder including a combination of tannin, lactose, fine-grained silica and aluminum powder.

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

5. The binder defined in claim 3, wherein the fine-grained silica has a particle size smaller than 50 m.

6. The binder defined in claim 3, wherein phenolic resin in powder form of up to 30 wt. % based on the mixture of lactose and tannin is added to the binder.

7. The binder defined in claim 3, wherein further fine-grained additives are added to the binder, namely magnesium or carbides, in particular SiC, B.sub.4C, TiC, or nitrides, in particular Si.sub.3N.sub.4, AIN, TiN, or borides.

8. The binder defined in claim 3, wherein doped silicon is added to the binder.

9. The binder defined in claim 3, wherein ethylene glycol is added to the binder in an amount of 0.1 to 5 wt %.

10. The binder defined in claim 3, wherein the proportion of tannin is greater than the proportion of lactose.

11. The compound defined in claim 2, 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.

12. (canceled)

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

14. (canceled)

15. 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 m and carbon having a combined binder based on tannin, lactose, fine-grained silica and aluminum powder to an inorganic fine granulation of <100 m 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.

16. (canceled)

Description

EXAMPLES

Example 1

[0067]

TABLE-US-00002 raw materials % oxide sintered magnesia <0.09 mm 23 sintered magnesia 0-1 mm 20 sintered magnesia 1-3 mm 37 sintered magnesia 3-6 mm 20 graphite 3.6 binder tannin 3.4 lactose 0.75 SiO.sub.2 0.23 aluminum 2.0 HEXA 0.5 ethylene glycol 1.5

Example 2

[0068]

TABLE-US-00003 raw materials % oxide sintered magnesia <0.09 mm 23 sintered magnesia 0-1 mm 20 sintered magnesia 1-3 mm 37 sintered magnesia 3-6 mm 20 graphite 3.6 binder tannin 3.4 lactose 0.75 SiO.sub.2 0.23 aluminum 2.0 HEXA 0.5 ethylene glycol 1.5 phenolic resin (powder) 1.0