Pyrometer and a method for fusing an alumina pipe having a high

Details Pyrometer and a method for fusing an alumina pipe having a high Pyrometer and a method for fusing an alumina pipe having a high

1991-06-03

1993-07-27

Yasich, Daniel M.

Thermal measuring and testing

Temperature measurement

By electrical or magnetic heat sensor

374208, G01K 718, G01K 108

Patent

active

052305651

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.

REFERENCES:
patent: 3647558 (1972-03-01), McMurtry
patent: 3647559 (1972-03-01), Truppe et al.
patent: 3818762 (1974-06-01), Kraus et al.
patent: 4377347 (1983-03-01), Hanmyo et al.
patent: 4721534 (1988-01-01), Phillippi et al.
patent: 4724428 (1988-02-01), Brown, Jr.
patent: 5069553 (1991-12-01), Phillippi

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