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Title: PROCESS OF COATING WITH NICKEL BY THE DECOMPOSITION OF NICKEL CARBONYL

Abstract

An improved process is presented for the deposition of nickel coatings by the thermal decomposition of nickel carbonyl vapor. The improvement consists in incorporating a small amount of hydrogen sulfide gas in the nickel carbonyl plating gas. It is postulated that the hydrogen sulfide functions as a catalyst. i

Inventors:
Publication Date:
Research Org.:
Originating Research Org. not identified
OSTI Identifier:
4238987
Patent Number(s):
US 2881094
Assignee:
U.S. Atomic Energy Commission DTIE; NSA-13-015434
NSA Number:
NSA-13-015434
Resource Type:
Patent
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-59
Country of Publication:
United States
Language:
English
Subject:
METALLURGY AND CERAMICS; CARBONYLS; CATALYSIS; COATING; DECOMPOSITION; HYDROGEN SULFIDES; NICKEL; NICKEL COMPOUNDS; TRACE AMOUNTS; VAPORS

Citation Formats

Hoover, T.B. PROCESS OF COATING WITH NICKEL BY THE DECOMPOSITION OF NICKEL CARBONYL. United States: N. p., 1959. Web.
Hoover, T.B. PROCESS OF COATING WITH NICKEL BY THE DECOMPOSITION OF NICKEL CARBONYL. United States.
Hoover, T.B. Wed . "PROCESS OF COATING WITH NICKEL BY THE DECOMPOSITION OF NICKEL CARBONYL". United States. doi:.
@article{osti_4238987,
title = {PROCESS OF COATING WITH NICKEL BY THE DECOMPOSITION OF NICKEL CARBONYL},
author = {Hoover, T.B.},
abstractNote = {An improved process is presented for the deposition of nickel coatings by the thermal decomposition of nickel carbonyl vapor. The improvement consists in incorporating a small amount of hydrogen sulfide gas in the nickel carbonyl plating gas. It is postulated that the hydrogen sulfide functions as a catalyst. i},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Apr 01 00:00:00 EST 1959},
month = {Wed Apr 01 00:00:00 EST 1959}
}
  • This paper describes a process for use in fabrication of nickel suboxide insulation on a superconductor. It comprises: reacting essentially oxygen-free nickel powder with essentially oxygen-free carbon monoxide at a temperature of at least 50{degrees} C. to produce a nickel carbonyl; separating the nickel carbonyl from reaction by-products and excess reagents by cooling the carbonyl to 10{degrees}-43{degrees} C and decanting the nickel carbonyl liquor to produce a purified carbonyl; and at least periodically contacting the purified carbonyl to a surface of a wire containing superconductor or superconductor precursors in an atmosphere at least periodically containing a controlled amount of oxygen,more » with the wire being at a temperature of 50{degrees}-800{degrees}C to produce nickel suboxide insulation on the wire.« less
  • monoxide on being contacted with a heated sunface. A closed system is described wherein advantage is taken of this reaction to nickel-clad the heated surfaces of various objects by continuously circulating Ni(CO)/sub 4/ in a CO carrier. High-grade coatings of nickel can be obtatned at 275 to 285 tained C with 20 to 25 vol% Ni(CO)/sub 4/in the gas and at 270 to 310 tained C at 0.5 to 5 vol% Ni(CO)/sub 4/. The oxygen content in the gas phase should not exceed 0.4 vol%. Since the thermal decomposition of Ni(CO)/sub 4/ is accompanied by an adsorption of heat, themore » rate of circulation of gas over the heated surface should be limited to 0.006 to 0.02 m/sec to control the temperature drop. The gas flow is periodically reserved to improve the uniformity of the coating. The cladding is weakly bonded irrespective of the metallic base, the roughness of the cladding, or the conditions of deposition. A thermal treatment in hydrcgen for 30 minutes at 550 to 770 tained C results in a firm bond that is maintained even after repeated bending to an angle of 180 tained . If the temperature of deposition is not rigidly controlled, fine bubbles can be detected in the cladding. Tests show that coatings>l0 ation in thickness are compact, non-porous, and resistant to corrosion when thermally treated with hydrogen at 550 to 700 tained C. Special measures must be taken to protect personnel from the poisonous effects of NNi(CO)/sub 4/ and CO. This method of nickel cladding is recommended over the electrolytic method whenever complicated shapes are to be clad, a less porous coating is desired, or a high-grade coating is not possible or very difficult by electrolytic methods. (TTT)« less