System, process and related sintered article

Patent metadata

Field	Value
Publication number	US-2019077674-A1
Application number	US-201816190914-A
Country	US
Kind code	A1
Filing date	Nov 14, 2018
Priority date	Jan 26, 2016
Publication date	Mar 14, 2019
Grant date	—

Abstract

A system, process and related sintered article are provided. The process includes supporting a piece of inorganic material with a pressurized gas and sintering the piece of inorganic material while supported by the pressurized gas by heating the piece of inorganic material to a temperature at or above a sintering temperature of the inorganic material such that the inorganic material is at least partially sintered forming the sintered article. The inorganic material is not in contact with a solid support during sintering. The sintered article, such as a ceramic article, is thin, has high surface quality, and/or has large surface areas.

First claim

What is claimed is:

1 . A process of forming a sintered article, comprising:
heating a green portion of a tape of polycrystalline ceramic and/or minerals in organic binder at a removal zone to a temperature sufficient to pyrolyze the organic binder, and thereby removing organic binder from the portion of tape; horizontally conveying the portion of tape with organic binder removed from the removal zone to a sintering zone, wherein the tape extending between the removal zone and the sintering zone is unsintered; and sintering polycrystalline ceramic and/or minerals of the portion of tape at the sintering zone by heating the polycrystalline ceramic and/or minerals to a temperature at or above a sintering temperature of the polycrystalline ceramic and/or minerals, wherein the tape simultaneously extends through the removal and sintering zones and comprises portions that contemporaneously include polycrystalline ceramic and/or minerals with organic binder, unsintered polycrystalline ceramic and/or minerals with organic binder removed, and at least partially sintered polycrystalline ceramic and/or minerals.

2 . The process of claim 1 , further comprising supporting the tape within the removal zone and the sintering zone with a gas bearing.

3 . The process of claim 1 , wherein the heating at the removal zone is to a temperature between 100 and 400 degrees Celsius, and wherein the sintering is at a temperature greater than 800 degrees Celsius.

4 . The process of claim 1 , wherein, in a processing direction, the tape is longer than the removal and sintering zones.

5 . The process of claim 1 , the tape is horizontally conveyed at a slower linear rate exiting the sintering zone than entering the removal zone while simultaneously extending through the removal and sintering zones.

6 . The process of claim 1 , wherein length of the tape is at least 100 times greater than width of the tape, and wherein the width is at least 10 times greater than thickness of the tape, and wherein the thickness is no more than 500 micrometers.

7 . A process of forming a sintered article, comprising:
heating a green portion of a tape of inorganic material in organic binder, at a removal zone, to a temperature sufficient to pyrolyze the organic binder, and thereby removing organic binder from the portion of tape; horizontally conveying the portion of tape with organic binder removed from the removal zone to a sintering zone, wherein the tape of inorganic material extending between the removal zone and the sintering zone is unsintered inorganic material; and sintering inorganic material of the portion of tape at the sintering zone by heating the inorganic material to a temperature at or above a sintering temperature of the inorganic material such that the inorganic material is sintered, wherein the tape simultaneously extends through the removal and sintering zones.

8 . The process of claim 7 , further comprising supporting the tape within the removal zone and the sintering zone with a gas bearing.

9 . The process of claim 7 , wherein the heating at the removal zone is to a temperature between 100 and 400 degrees Celsius, and wherein the sintering is at a temperature greater than 800 degrees Celsius.

10 . The process of claim 7 , wherein the tape contemporaneously comprises a portion that includes inorganic material with organic binder and another portion that includes at least partially sintered inorganic material.

11 . The process of claim 7 , wherein, in a processing direction, the tape is longer than the removal and sintering zones.

12 . The process of claim 7 , wherein the tape is horizontally conveyed at a slower linear rate exiting the sintering zone than entering the removal zone, while simultaneously extending through the removal and sintering zones.

13 . The process of claim 7 , wherein length of the tape is at least 100 times greater than width of the tape, and wherein the width is at least 10 times greater than thickness of the tape, and wherein the thickness is no more than 500 micrometers.

14 . A process of forming a sintered article, comprising:
heating a green portion of a tape of inorganic material in organic binder, at a removal zone, to a temperature sufficient to pyrolyze the organic binder, and thereby removing organic binder from the portion of tape; horizontally conveying the portion of tape with organic binder removed from the removal zone to a sintering zone, wherein the tape of inorganic material extending between the removal zone and the sintering zone is unsintered inorganic material; and sintering inorganic material of the portion of tape at the sintering zone by heating the inorganic material to a temperature at or above a sintering temperature of the inorganic material such that the inorganic material is sintered wherein the tape contemporaneously comprises a portion that includes inorganic material with organic binder and, spaced apart lengthwise along the tape therefrom, another portion that includes at least partially sintered inorganic material.

15 . The process of claim 14 , further comprising supporting the tape within the removal zone and the sintering zone with a gas bearing.

16 . The process of claim 14 , wherein the heating at the removal zone is to a temperature between 100 and 400 degrees Celsius, and wherein the sintering is at a temperature greater than 800 degrees Celsius.

17 . The process of claim 14 , wherein, in a processing direction, the tape is longer than the removal and sintering zones.

18 . The process of claim 14 , wherein the tape is horizontally conveyed at a slower linear rate exiting the sintering zone than entering the removal zone, while simultaneously extending through the removal and sintering zones.

19 . The process of claim 14 , wherein length of the tape is at least 100 times greater than width of the tape, and wherein the width is at least 10 times greater than thickness of the tape, and wherein the thickness is no more than 500 micrometers.

20 . The process of claim 14 , wherein the tape also contemporaneously comprises yet another portion that includes unsintered inorganic material with organic binder removed.

Assignees

• Corning Inc

Inventors

• Badding Michael Edward
• Bouton William Joseph
• Brackley Douglas Edward
• Kester Lanrik Wayne
• Ketcham Thomas Dale
• Miller Eric Lee
• Tanner Cameron Wayne
• Zimmermann James William

Classifications

• C03B19/06

  by sintering, {e.g. by cold isostatic pressing of powders and subsequent sintering, by hot pressing of powders, by sintering slurries or dispersions not undergoing a liquid phase reaction} · CPC title

• C04B2235/3244

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

• C03B29/12

  being in a horizontal position on a fluid support, e.g. a gas or molten metal · CPC title

• C01G25/02

  Oxides · CPC title

• C04B35/632

  Organic additives · CPC title