A process for producing a honeycomb ceramic article includes providing a green honeycomb body including ceramic-forming materials and organic pore forming materials and subjecting the green honeycomb body to a firing cycle in a kiln in which steam is added to the kiln atmosphere in an amount from ab
A process for producing a honeycomb ceramic article includes providing a green honeycomb body including ceramic-forming materials and organic pore forming materials and subjecting the green honeycomb body to a firing cycle in a kiln in which steam is added to the kiln atmosphere in an amount from about 10% to about 100%, based on volume. Also provided are ceramic articles produced by the process.
대표청구항▼
1. A process for producing a honeycomb ceramic article, the process comprising: providing a green honeycomb body including inorganic ceramic-forming materials and organic pore forming materials; andsubjecting the green honeycomb body to a firing cycle in a kiln in which steam is added to the kiln at
1. A process for producing a honeycomb ceramic article, the process comprising: providing a green honeycomb body including inorganic ceramic-forming materials and organic pore forming materials; andsubjecting the green honeycomb body to a firing cycle in a kiln in which steam is added to the kiln atmosphere in an amount from about 40% to about 100%, based on volume. 2. The process of claim 1, wherein the addition of steam to the kiln atmosphere occurs at least during a portion of the firing cycle below about 1000° C. 3. The process of claim 1, wherein the inorganic ceramic-forming materials yield at least one of cordierite, mullite, aluminum-titanate, silicon carbide, or alumina when subjected to the firing cycle. 4. The process of claim 2, wherein the addition of steam to the kiln atmosphere occurs during a top soak portion of the firing cycle. 5. The process of claim 1, wherein the steam is mixed with air, oxygen, nitrogen or mixtures thereof. 6. The process of claim 1, wherein a kiln temperature is increased from room temperature to at least about 800° C. at a rate of from about 50° C/hr to about 100° C/hr. 7. The process of claim 1, wherein a kiln temperature is decreased from a top soak temperature during the firing cycle at a rate of greater than about 50°C./hour. 8. The process of claim 7, wherein the kiln temperature is decreased from a top soak temperature during the firing cycle at a rate of greater than about 100°C./hour. 9. The process of claim 1, wherein the firing cycle is less than about 100 hours long. 10. The process of claim 1, wherein the firing cycle is less than about 65 hours long. 11. The process of claim 1, wherein the organic pore forming materials comprise greater than about 20 weight percent by super addition. 12. The process of claim 1, wherein the organic pore forming materials comprise at least one of graphite and starch. 13. A ceramic article produced by: providing inorganic ceramic-forming ingredients, a cellulose based binder, an aqueous based solvent and a pore forming agent;mixing the ceramic-forming ingredients, the binder, the solvent, and the pore forming agent to form a precursor batch, the precursor batch comprising organic materials in an amount greater than about 30 wt. % by super addition;forming the precursor batch into a green honeycomb body; andfiring the green honeycomb body to produce the ceramic article, wherein steam is added to a firing atmosphere in an amount from about 40% to about 100%, based on volume at least during a portion of the firing cycle below about 1000° C., whereinthe inorganic ceramic-forming ingredients yield cordierite, andthe ratio of orthorhombic cordierite to hexagonal cordierite is greater than about 9 to 1. 14. The ceramic article of claim 13, wherein firing comprises decreasing the temperature from a top soak temperature during the firing cycle at a rate of greater than about 100° C./hour. 15. The ceramic article of claim 13, wherein the ceramic article is a honeycomb monolith. 16. The ceramic article of claim 13, wherein the pore forming agent is at least one of graphite and starch. 17. The ceramic article of claim 13, wherein the steam is present from about 40% to about 60% by volume. 18. The ceramic article of claim 13, wherein the firing cycle is less than about 65 hours long. 19. A process for producing a honeycomb ceramic article, the process comprising: providing a green honeycomb body including inorganic ceramic-forming materials and organic pore forming materials; andsubjecting the green honeycomb body to a firing cycle in a kiln in which steam is added to the kiln atmosphere in an amount from about 10% to about 100%, based on volume,wherein the inorganic ceramic-forming materials yield at least one of cordierite, mullite, aluminum-titanate, or alumina when subjected to the firing cycle.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (7)
Ogunwumi, Steven Bolaji; Tanner, Cameron Wayne, Ceramic materials for 4-way and NOadsorber and method for making same.
Kinoshita Yukiharu,JPX ; Takahashi Hiroyasu,JPX ; Sawai Jun,JPX, Process of fabricating a manganese-zinc-ferrite core, and manganese zinc-base ferrite core.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.