Fire-resistant ceramic product

Patent metadata

Field	Value
Publication number	US-2017190625-A1
Application number	US-201515313082-A
Country	US
Kind code	A1
Filing date	Apr 21, 2015
Priority date	Jun 26, 2014
Publication date	Jul 6, 2017
Grant date	—

Abstract

The invention relates to a fire-resistant ceramic product.

First claim

1 . A refractory ceramic product whose microstructure has the following features:
a matrix composed of at least one first material; grains of at least one second material are embedded in the matrix; the grains of the second material have a coating composed of at least one third material on at least part of their surface; the first and second material have a different coefficient of thermal expansion; the third material is stable during use of the product.

2 . The product as claimed in claim 1 in the form of a sintered product.

3 . The product as claimed in claim 1 , wherein the first material is based on one or more of the following oxides or compounds: MgO, Al 2 O 3 , Fe 2 O 3 , SiO 2 , CaO, Cr 2 O 3 , ZrO 2 , Mn 2 O 3 , TiO 2 or one or more of the compounds magnesia spinel, hercynite, galaxite or forsterite.

4 . The product as claimed in claim 1 , wherein the second material is based on one or more of the following oxides or compounds thereof: Al 2 O 3 , MgO, SiO 2 or ZrO 2 .

5 . The product as claimed in claim 1 , wherein the third material is based on at least one of the following materials: gahnite, magnesia spinel, forsterite, mullite, calcium zirconate or AB 2 O 4 (where A=Al 3+ , Cr 3+ or Fe 3+ and B=Mg 2+ , Zn 2+ , Fe 2+ , Mn 2+ or Ni 2+ ).

6 . The product as claimed in claim 1 , wherein the thickness of the coating is in the range from 5 to 300 μm.

7 . The product as claimed in claim 1 , wherein the first material is in the form of grains sintered to one another.

8 . The product as claimed in claim 1 , wherein the coefficient of thermal expansion of the second material is at least 10% greater or less than the coefficient of thermal expansion of the first material, based on the coefficient of thermal expansion of the first material.

9 . The product as claimed in claim 1 , wherein the particle size of the grains of the second material is between the particle size of the smallest grains and the largest grains of the first material.

Assignees

• Refractory Intellectual Property Gmbh & Co Kg

Inventors

• Nilica Roland
• Platzer Alexander
• Piribauer Christoph

Classifications

• C04B2235/3284

  Zinc oxides, zincates, cadmium oxides, cadmiates, mercury oxides, mercurates or oxide forming salts thereof · CPC title

• C04B35/053 Primary

  Fine ceramics · CPC title

• C04B2235/3217

  Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina · CPC title

• C04B2235/3206

  Magnesium oxides or oxide-forming salts thereof · CPC title

• C04B35/63

  using additives specially adapted for forming the products {, e.g.. binder binders} · CPC title