Claims
- 1. A method of producing a hollow raw ceramic article, comprising the steps of:
- pouring enough slurry, comprising water and ceramic raw material, into an opening of an hydrophilic mold to substantially fill such mold with said slurry;
- inserting a device, for measuring a change in liquid surface level of said slurry, through said opening into said slurry;
- measuring a liquid surface level of said slurry of said substantially filled mold using said liquid level measuring device;
- absorbing an amount of water from said slurry through said mold to thereby deposit said ceramic raw material from said slurry onto an inner surface of said mold;
- measuring a decrease in said liquid surface level, corresponding to said amount of said water absorbed from said slurry through said mold, using said liquid level measuring device;
- draining excess slurry from said mold through said opening based upon a measured decrease of said liquid surface level which corresponds to deposition of a given thickness of said ceramic raw material from said slurry onto said inner surface of said mold, thereby forming said raw ceramic article; and
- 2. The method of claim 1, wherein said article is a ceramic port liner.
- 3. The method of claim 1, wherein said liquid level measuring device is a liquid level meter.
- 4. The method of claim 1, wherein said liquid level measuring device is a transparent pipe fitted to said opening.
- 5. A method of producing a tubular ceramic port liner, comprising the steps of:
- pouring slurry comprising water and ceramic raw material into an opening of an hydrophilic mold;
- absorbing water from said slurry through said mold to thereby deposit said ceramic raw material from said slurry onto an inner surface of said mold;
- draining an amount of said slurry from said mold through said opening after a predetermined thickness of said ceramic raw material has deposited on said inner surface of said mold during said water absorption step;
- covering said opening with an hydrophilic plate and inverting said mold;
- depositing slurry remaining in said mold onto said plate to form a layer of said ceramic raw material thereon which closes said opening, thereby forming a raw ceramic port liner body;
- removing said raw ceramic port liner body from said mold;
- firing said raw ceramic port liner body; and
- opening opposite ends of said fired port liner body.
- 6. The method of claim 5, further comprising forming an air escape hole in each opposite end of said raw ceramic port liner body.
- 7. The method of claim 5, wherein said ceramic raw material is comprised of aluminum titanate.
- 8. The method of claim 5, wherein said opening is a valve hole.
Priority Claims (5)
Number |
Date |
Country |
Kind |
62-257656 |
Oct 1987 |
JPX |
|
62-257657 |
Oct 1987 |
JPX |
|
62-257659 |
Oct 1987 |
JPX |
|
62-257660 |
Oct 1987 |
JPX |
|
62-257661 |
Oct 1987 |
JPX |
|
Parent Case Info
This is a continuation of application Ser. No. 07/255,386, filed Oct. 11, 1988, now abandoned.
US Referenced Citations (12)
Foreign Referenced Citations (6)
Number |
Date |
Country |
0285312 |
Oct 1988 |
EPX |
2657177 |
Jun 1978 |
DEX |
3706208 |
Oct 1987 |
DEX |
517204 |
Jan 1940 |
GBX |
2088331 |
Jun 1982 |
GBX |
2124540 |
Feb 1984 |
GBX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
255386 |
Oct 1988 |
|