Pyrometer and a method for fusing an alumina pipe having a high purity
US5230565A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 3, 1991 |
| Grant date | Jul 27, 1993 |
| Priority date | — |
| Expiry date | Jun 3, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K7/18
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An improved new type pyrometer and a method for fusing an alumina pipe having a high purity are disclosed. The temperature-measuring portion of the pyrometer includes a protective pipe made of alumina having a purity of at least 99.9% and a temperature-measuring resistance element of a platinum or platinum-rhodium resistance wire and a holding portion made of alumina having a purity of at least 99.9%. Owing to the use of high purity alumina, the platinum or platinum-rhodium resistance wire is not contaminated and has stable temperature characteristics at high temperatures. According to the method of this invention, an end of an alumina pipe having a purity of at least 99.9% can be fused without the aid of any binder by fusing the end while evacuating air from the alumina pipe through its opposite end.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.