Claims
- 1. Method of coating a graphite tube, said method comprising the steps of:
- forming a layer of adhesive, volatile material on said graphite tube;
- applying a powder of inert material to said layer;
- pyrolyzing, in the presence of an inert gas flow, said layer; and thereafter
- coating said graphite tube with pyrolytic graphite.
- 2. Method as claimed in claim 1 wherein said adhesive, volatile layer includes beeswax.
- 3. Method as claimed in claim 2 wherein said applying step includes immersing said graphite tube in a solution of beeswax.
- 4. Method as claimed in claims 1, 2 or 3 further including the step of admixing a carbonaceous gas with said inert gas during said coating step.
- 5. Method as claimed in claim 4 wherein said graphite tube is heated to about 1900.degree. C., said inert gas is argon and said carbonaceous gas is methane in an admixture of up to 10 percent by volume.
- 6. Method as claimed in claim 1 wherein said graphite tube is heated in a graphite tube atomizer of an atomic absorption spectrometer.
- 7. Method as claimed in claim 1 wherein said inert material is a high-melting carbide.
- 8. Method as claimed in claim 1 wherein said inert material is a ceramic material.
- 9. Method as claimed in claim 1 wherein said inert material is tungsten.
- 10. Method as claimed in claim 9 wherein said applying step includes introducing said graphite tube into a packing of carbide forming metal in powder form and heating said tube therein to the temperature whereat a superficial carbide is formed.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3010717 |
Mar 1980 |
DEX |
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Parent Case Info
This application is a continuation of Application Ser. No. 245,790, filed Mar. 20, 1981, now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3860437 |
Gust |
Jan 1975 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
245790 |
Mar 1981 |
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