Chromium oxide refractory object and methods of forming thereof

Patent metadata

Field	Value
Publication number	US-10336653-B2
Application number	US-201715422605-A
Country	US
Kind code	B2
Filing date	Feb 2, 2017
Priority date	Feb 5, 2016
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

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 1.8 wt. % and not greater than about 5.6 wt. % TiO 2 of the total weight of the refractory object;
a ZrO 2 content of not greater than about 7.5 wt. % of the total weight of the refractory object;
a ratio ROC Al2O3 /ROC SiO2 of at least 1 and not greater than 6.5, 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; and
an MOR of at least about 47 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 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.

4. 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.

5. 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.

6. 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 .

Assignees

• Saint Gobain Ceramics

Inventors

• Pappacena Kristen E
• Fourcade Julien P

Classifications

• C04B35/64

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

• C04B35/12 Primary

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

• C04B2235/72

  Products characterised by the absence or the low content of specific components, e.g. alkali metal free alumina ceramics · CPC title

• C04B2235/3418

  Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint · CPC title

• C04B2235/77

  Density · CPC title