Refractory article, coating composition for preventing redox reaction, and method of manufacturing a refractory article

Patent metadata

Field	Value
Publication number	US-2021140027-A1
Application number	US-201816623594-A
Country	US
Kind code	A1
Filing date	Jun 18, 2018
Priority date	Jun 19, 2017
Publication date	May 13, 2021
Grant date	—

Abstract

Provided are a refractory article, an anti-redox coating composition, and a method of manufacturing the refractory article. The refractory article includes: a platinum (Pt)-based substrate; and a coating layer for preventing a redox reaction on a surface of the Pt-based substrate, wherein the coating layer for preventing a redox reaction includes on an oxide basis SiO2 in an amount of about 40 wt % to about 70 wt %, Al2O3 in an amount of about 20 wt % to about 52 wt %, B2O3 in an amount of about 3 wt % to about 6 wt %; and CaO in an amount of about 2.4 wt % to about 4.8 wt %.

First claim

1 . A refractory article comprising:
a platinum (Pt)-based substrate; and a coating layer disposed on the Pt-based substrate, the coating layer comprising on an oxide basis SiO 2 in an amount of about 40 wt % to about 70 wt %, Al 2 O 3 in an amount of about 20 wt % to about 52 wt %, B 2 O 3 in an amount of about 3 wt % to about 6 wt %; and CaO in an amount of about 2.4 wt % to about 4.8 wt %.

2 . The refractory article of claim 1 , wherein the coating layer comprises whiskers distributed in a silica matrix.

3 . The refractory article of claim 2 , wherein the whiskers comprise a mullite crystalline phase.

4 . The refractory article of claim 1 , wherein the refractory article is a stir chamber comprising an internal surface of Pt-based substrate, and the coating layer is coated on at least a portion of the internal surface of the stir chamber.

5 . The refractory article of claim 4 , wherein the coating layer comprises on an oxide basis SiO 2 in an amount of about 40 wt % to about 60 wt %; Al 2 O 3 in an amount of about 32 wt % to about 52 wt %; B 2 O 3 in an amount of about 3 wt % to about 6 wt %; and CaO in an amount of about 2.4 wt % to about 4.8 wt %.

6 . The refractory article of claim 4 , further comprising a stirrer, wherein the coating layer coated on at least a portion of an external surface of the stirrer.

7 . The refractory article of claim 1 , wherein the refractory article is a tube having a surface of a Pt-based substrate, wherein coating layer is coated on at least a portion of an external surface of the tube.

8 . The refractory article of claim 7 , wherein the coating layer comprises on an oxide basis SiO 2 in an amount of about 60 wt % to about 70 wt %; Al 2 O 3 in an amount of about 20 wt % to about 30 wt %; B 2 O 3 in an amount of about 3 wt % to about 6 wt %; and CaO in an amount of about 2.4 wt % to about 4.8 wt %.

9 . The refractory article of claim 1 , further comprising a network modifier in an amount of about 1 wt % to about 7 wt %.

10 . An anti oxidation-reduction coating composition, comprising:
a first refractory material comprising on an oxide basis SiO 2 in an amount from about 55 wt % to about 70 wt %; Al 2 O 3 in an amount from about 12 wt % to about 22 wt %; B 2 O 3 in an amount from about 5 wt % to about 15 wt %; and CaO in an amount from about 5 wt % to about 10 wt %; a second refractory material comprising SiO 2 as a main component; and a third refractory material containing Al 2 O 3 as a main component, wherein an amount of the second refractory material is about 25 parts by weight to about 130 parts by weight and an amount of the third refractory material is about 20 parts by weight to about 150 parts by weight with respect to the first refractory material in an amount of 100 parts by weight.

11 . The anti oxidation-reduction coating composition of claim 10 , wherein the composition is for coating an internal surface of a stir chamber, and the amount of the second refractory material is about 25 parts by weight to about 115 parts by weight and the amount of the third refractory material is about 45 parts by weight to about 150 parts by weight with respect to the first refractory material in an amount of 100 parts by weight.

12 . The anti oxidation-reduction coating composition of claim 10 , wherein the composition is for coating an external surface of a tube, and the amount of the second refractory material is about 33 parts by weight to about 90 parts by weight and the amount of the third refractory material is about 20 parts by weight to about 45 parts by weight with respect to the first refractory material in an amount of 100 parts by weight.

13 . A method of fabricating a refractory article, the method comprising:
applying a slurry coating layer on an article comprising a platinum (Pt)-based substrate, the slurry coating layer comprising a first refractory material, a second refractory material, and a third refractory material, the first refractory material comprising on an oxide basis SiO 2 in an amount of about 55 wt % to about 70 wt %, Al 2 O 3 in an amount of about 12 wt % to about 22 wt %, B 2 O 3 in an amount of about 5 wt % to about 15 wt %, and CaO in an amount of about 5 wt % to about 10 wt %, the second refractory material containing SiO 2 as a main component, and the third refractory material containing alumina as a main component; and heat treating the slurry coating layer, thereby forming the refractory article.

14 . The method of claim 13 , wherein the applying of the slurry coating layer is performed by a spray method.

15 . The method of claim 14 , wherein the spray method is performed simultaneously with homogenizing the slurry at a supply source of the slurry.

16 . The method of claim 13 , wherein the heat treating is performed at a temperature in a range from about 1350° C. to about 1550° C. for a time in a range from about 30 hours to about 100 hours.

17 . The method of claim 13 , wherein, after the heat treating, a micro-structure including particles of mullite crystals dispersed in a silica matrix is resulted from the slurry coating layer by the heat treating.

18 . The method of claim 13 , wherein the slurry coating comprises the second refractory material in an amount of about 25 parts by weight to about 130 parts by weight and the third refractory material in an amount of about 20 parts by weight to about 150 parts by weight with respect to the first refractory material in an amount of 100 parts by weight.

19 . The method of claim 18 , wherein the article is a stir chamber, and the slurry coating layer comprises the second refractory material in an amount of about 25 parts by weight to about 115 parts by weight and the third refractory material in an amount of about 45 parts by weight to about 150 parts by weight with respect to the first refractory material in an amount of 100 parts by weight.

20 . The method of claim 18 , wherein the article is a tube, and the slurry coating layer comprises the second refractory material in an amount of about 33 parts by weight to about 90 parts by weight and the third refractory material in an amount of about 20 parts by weight to about 45 parts by weight with respect to the first refractory material in an amount of 100 parts by weight.

Assignees

• Corning Inc

Inventors

• Cho Myeong-Jin
• Choi Hong-Goo
• Choi Soon-Yong
• Kwak Ki-Ju
• Lee Yong-Won
• Sung Yun-Kyung

Classifications

• B01F35/512

  characterised by surface properties, e.g. coated or rough · CPC title

• B01F27/80

  with stirrers rotating about a substantially vertical axis · CPC title

• B01F35/186

  using splash guards in mixers for avoiding dirt or projection of material · CPC title

• B01F27/053

  characterised by their materials · CPC title

• B01F27/0531

  with particular surface characteristics, e.g. coated or rough · CPC title