Chromium oxide refractory object and methods of forming thereof

Patent metadata

Field	Value
Publication number	US-2017226017-A1
Application number	US-201715422605-A
Country	US
Kind code	A1
Filing date	Feb 2, 2017
Priority date	Feb 5, 2016
Publication date	Aug 10, 2017
Grant date	—

Abstract

A refractory object may include a Cr 2 O 3 content of at least about 80 wt. % of a total weight of the refractory object, an Al 2 O 3 content of at least about 0.7 wt. % and not greater than about 10.0 wt. % of the total weight of the refractory object, a SiO 2 content of at least about 0.3 wt. % and not greater than about 5.0 wt. % of the total weight of the refractory object and a TiO 2 content of at least about 1.0 wt. % and not greater than about 5.6 wt. % TiO 2 of the total weight of the refractory object. The refractory object may further include an MOR of at least about 37 MPa as measured at 1200° C.

First claim

What is claimed is:

1 . A refractory object comprising:
a Cr 2 O 3 content of at least about 80 wt. % of a total weight of the refractory object; an Al 2 O 3 content of at least about 0.7 wt. % and not greater than about 10.0 wt. % of the total weight of the refractory object; a SiO 2 content of at least about 0.3 wt. % and not greater than about 5.0 wt. % of the total weight of the refractory object; a TiO 2 content of at least about 1.0 wt. % and not greater than about 5.6 wt. % TiO 2 of the total weight of the refractory object; and an MOR of at least about 37 MPa as measured at 1200° C.

2 . The refractory object claim 1 , wherein the refractory object further comprises a ratio RO MOR /(1000*RO MOE ) of at least about 0.5, where RO MOR is equal to the MOR of the refractory object as measured in MPa at 1200° C. and R MOE is equal to the MOE of the refractory object in GPa as measured at 1200° C.

3 . The refractory object of claim 1 , wherein the refractory object further comprises a ratio ROC Al2O3 /ROC SiO2 of at least about 0.9, where ROC Al2O3 represents a content of Al 2 O 3 in wt. % of the total weight of the refractory object and ROC SiO2 represents a content of SiO 2 in wt. % of the total weight of the refractory object.

4 . The refractory object of claim 1 , wherein the refractory object further comprises a MgO content of at least about 0.1 wt. % and not greater than about 1.0 wt. % of the total weight of the refractory object.

5 . The refractory object of claim 1 , wherein the refractory object further comprises a ZrO 2 content of at least about 0.1 wt. % and not greater than about 10 wt. % of the total weight of the refractory object.

6 . The refractory object of claim 1 , wherein the refractory object further comprises a grog content of at least about 1.0 wt. % and not greater than about 60 wt. % of the total weight of the refractory object.

7 . The refractory object of claim 1 , wherein the refractory object further comprises a ratio ROC ZrO2 /ROC Al2O3 of at least about 0.1 and not greater than about 5, where ROC ZrO2 represents a content of ZrO 2 in wt. % of the total weight of the refractory object and ROC Al2O3 represents a content of Al 2 O 3 in wt. % of the total weight of the refractory object.

8 . The refractory object of claim 1 , wherein the refractory object further comprises a porosity of at least about 0.07 vol. % and not greater than about 18 vol. % of the total volume of the refractory object.

9 . The refractory object of claim 1 , wherein the refractory object further comprises a density of at least about 4.1 g/cm 3 and not greater than about 4.8 g/cm 3 .

10 . A refractory object comprising:
a Cr 2 O 3 content of at least about 80 wt. % of a total weight of the refractory object; a TiO 2 content of at least about 1.0 wt. % and not greater than about 5.6 wt. % TiO 2 of the total weight of the refractory object; and a ratio ROC Al2O3 /ROC SiO2 of at least about 1 and not greater than about 8, wherein ROC Al2O3 represents a content of Al 2 O 3 in wt. % of the total weight of the refractory object and ROC SiO2 represents a content of SiO 2 in wt. % of the total weight of the refractory object.

11 . The refractory object of claim 10 , wherein the refractory object further comprises an Al 2 O 3 content of at least about 0.7 wt. % and not greater than about 10.0 wt. % of the total weight of the refractory object.

12 . The refractory object of claim 10 , wherein the refractory object further comprises a SiO 2 content of at least about 0.3 wt. % and not greater than about 5.0 wt. % of a total weight of the refractory object.

13 . The refractory object claim 10 , wherein the refractory object further comprises a ratio RO MOR /(1000*RO MOE ) of at least about 0.5, where RO MOR is equal to the MOR of the refractory object as measured in MPa at 1200° C. and R MOE is equal to the MOE of the refractory object in GPa as measured at 1200° C.

14 . The refractory object of claim 10 , wherein the refractory object further comprises a MgO content of at least about 0.1 wt. % and not greater than about 1.0 wt. % of the total weight of the refractory object.

15 . The refractory object of claim 10 , wherein the refractory object further comprises a ZrO 2 content of at least about 0.1 wt. % and not greater than about 10 wt. % of the total weight of the refractory object.

16 . The refractory object of claim 10 , wherein the refractory object further comprises a grog content of at least about 1.0 wt. % and not greater than about 60 wt. % of the total weight of the refractory object.

17 . The refractory object of claim 10 , wherein the refractory object further comprises a ratio ROC ZrO2 /ROC Al2O3 of at least about 0.1 and not greater than about 5, where ROC ZrO2 represents a content of ZrO 2 in wt. % of the total weight of the refractory object and ROC Al2O3 represents a content of Al 2 O 3 in wt. % of the total weight of the refractory object.

18 . The refractory object of claim 10 , wherein the refractory object further comprises a porosity of at least about 0.07 vol. % and not greater than about 18 vol. % of the total volume of the refractory object.

19 . The refractory object of claim 10 , wherein the refractory object further comprises a density of at least about 4.1 g/cm 3 and not greater than about 4.8 g/cm 3 .

20 . A method of forming a refractory object comprising:
providing a forming composition; and forming the forming composition into a refractory object, wherein the refractory object comprises:
a Cr 2 O 3 content of at least about 80 wt. % of a total weight of the refractory object;
an Al 2 O 3 content of at least about 0.7 wt. % and not greater than about 10.0 wt. % of the total weight of the refractory object;
a SiO 2 content of at least about 0.3 wt. % and not greater than about 5.0 wt. % of the total weight of the refractory object;
a TiO 2 content of at least about 1.0 wt. % and not greater than about 5.6 wt. % TiO 2 of the total weight of the refractory object; and
an MOR of at least about 37 MPa as measured at 1200° C.

Assignees

• Saint-Gobain Ceram & Plastics Inc

Inventors

• Pappacena Kristen E
• Fourcade Julien P

Classifications

• C04B35/12 Primary

  based on chromium oxide (C04B35/047 and C04B35/105 take precedence) · CPC title

• C04B35/64

  Burning or sintering processes (C04B33/32 takes precedence {; powder metallurgy B22F}) · CPC title

• C04B2235/3244

  Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof · CPC title

• C04B2235/3206

  Magnesium oxides or oxide-forming salts thereof · CPC title

• C04B38/00

  Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof (treating slag with gases or gas generating material C04B5/06 {; expanded graphite C04B35/536}) · CPC title