Claims
- 1. A process for producing a ceramic double-wall structural tube, comprising the steps of:
- extruding a green ceramic double-wall structural tube comprising an outer tube member, an inner tube member and a plurality of supporting portions integrating the outer and inner tube members;
- drying the green ceramic tube;
- grinding and removing the inner tube member and supporting portions to a given depth measured from a first end of the dried outer tube member;
- inserting an organic porous member into said first end of the dried outer tube member to abut against the ground supporting portions and to be spaced from an open end of said inner tube member, said organic porous member being shaped to coincide with an inner periphery of an end portion of the outer tube member to be sealed;
- pouring and depositing a slurry into said first end of the outer tube member and on an axially outer side of the organic porous member, said slurry exhibiting the same coefficient of thermal expansion as that of the ceramic double-wall structural tube during firing;
- drying said slurry to thus close said first end of the outer tube member; and
- firing the ceramic double-wall structural tube.
- 2. The process of claim 1, wherein said slurry comprises the same material as that of said ceramic double-wall structural tube.
- 3. The process of claim 1, wherein said inner tube member is arranged concentrically within said outer tube member.
Priority Claims (1)
Number |
Date |
Country |
Kind |
62-155401 |
Jun 1987 |
JPX |
|
Parent Case Info
This is a Divisional Application of application Ser. No. 07/205,349 filed June 10, 1988 now U.S. Pat. No. 4,965,101.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4157194 |
Takahashi |
Jun 1979 |
|
4817672 |
Broodman |
Apr 1989 |
|
4923655 |
Oshima et al. |
May 1990 |
|
Divisions (1)
|
Number |
Date |
Country |
Parent |
205349 |
Jun 1988 |
|