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Title: LUBRICATION OF TITANIUM. Period covered March 15, 1957 to December 15, 1957

Abstract

This investigation sought to obtain some information about the frictional properties of modified titanium coatings and to make a comparison of the wear resistance of the best surface treatments in the presence of various lubricants using the Shell Four-Ball Wear Tester and the Falex Tester. It has been found that systems showing high wear rates in one tester will also show high wear rates in the other. If wear is expressed as volume or weight loss (W), it may generally be correlated vdth load (L) and time (t) by an expression of the form W = KLt for either tester. rhe constant K includes the characteristics of the machine, the nature of the specimens and the nature of the lubricant. It is concluded that the essential nature of the action taking place in either tester is identical and that therefore any lack of correlation must be attributed to operation in widely different pressure and temperature ranges. The correlation of wear rates with the frictional characteristics of the different systems was attempted in both testers with moderate success. The reproducibility of the results for various systems is too poor to permit differentiating between the different titanium base alloys used in anymore » particular treatment. As for the various surface treatments investigated, it appears that it is possible to obtain equivalent wear resistance in many cases using electroless nickel plates, cyanided, ritrided, carburized, oxidized, or carburized iron-plated titanium. Of these, oxidized and electroless nickel plated titanium fail at high loads. The use of conventional lubricants for any but electroless nickel and carburized iron- plated titanium is unreliable. Halogenated materials appear to be the best lubricants for the other treatments. It has been shown that the higher the halogen content of the lubricant, the better its lubricating properties. (auth)« less

Authors:
Publication Date:
Research Org.:
Clevite Research Center, Cleveland
OSTI Identifier:
4306803
Report Number(s):
WADC-TR-57-61(Pt.II)
NSA Number:
NSA-12-007265
DOE Contract Number:
AF33(616)-3350
Resource Type:
Technical Report
Resource Relation:
Other Information: Project title: METALLIC MATERIALS. Task title: TITANIUM METAL AND ALLOYS. Orig. Receipt Date: 31-DEC-58
Country of Publication:
United States
Language:
English
Subject:
MINERALOGY, METALLURGY, AND CERAMICS; CYANIDES; EQUATIONS; FRICTION; HALOGENS; IRON ALLOYS; IRON CARBIDES; IRON NITRIDES; IRON OXIDES; LUBRICATION; NICKEL; NICKEL OXIDES; PLATES; PLATING; PRESSURE; QUANTITY RATIO; SURFACES; TEMPERATURE; TITANIUM; TITANIUM ALLOYS; WEAR

Citation Formats

Fatica, N. LUBRICATION OF TITANIUM. Period covered March 15, 1957 to December 15, 1957. United States: N. p., 1957. Web.
Fatica, N. LUBRICATION OF TITANIUM. Period covered March 15, 1957 to December 15, 1957. United States.
Fatica, N. Sun . "LUBRICATION OF TITANIUM. Period covered March 15, 1957 to December 15, 1957". United States. doi:.
@article{osti_4306803,
title = {LUBRICATION OF TITANIUM. Period covered March 15, 1957 to December 15, 1957},
author = {Fatica, N.},
abstractNote = {This investigation sought to obtain some information about the frictional properties of modified titanium coatings and to make a comparison of the wear resistance of the best surface treatments in the presence of various lubricants using the Shell Four-Ball Wear Tester and the Falex Tester. It has been found that systems showing high wear rates in one tester will also show high wear rates in the other. If wear is expressed as volume or weight loss (W), it may generally be correlated vdth load (L) and time (t) by an expression of the form W = KLt for either tester. rhe constant K includes the characteristics of the machine, the nature of the specimens and the nature of the lubricant. It is concluded that the essential nature of the action taking place in either tester is identical and that therefore any lack of correlation must be attributed to operation in widely different pressure and temperature ranges. The correlation of wear rates with the frictional characteristics of the different systems was attempted in both testers with moderate success. The reproducibility of the results for various systems is too poor to permit differentiating between the different titanium base alloys used in any particular treatment. As for the various surface treatments investigated, it appears that it is possible to obtain equivalent wear resistance in many cases using electroless nickel plates, cyanided, ritrided, carburized, oxidized, or carburized iron-plated titanium. Of these, oxidized and electroless nickel plated titanium fail at high loads. The use of conventional lubricants for any but electroless nickel and carburized iron- plated titanium is unreliable. Halogenated materials appear to be the best lubricants for the other treatments. It has been shown that the higher the halogen content of the lubricant, the better its lubricating properties. (auth)},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Dec 15 00:00:00 EST 1957},
month = {Sun Dec 15 00:00:00 EST 1957}
}

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  • S>The adaptation of the crossed-cylinder specimen associated with specimen preparation in the investigation of various titaniuni-lubricant systems. It is shown that the crossed-cylinder test results correlate closely with the Shell Four-Ball test results. The crossedcylinder tester was used to evaluate the wear resistance of cyanided and electroless-nickel plated specimens of six titanium alloys. The results show that electrolessnickel plated titanium, using conventional lubricants, is superior to the best cyanided titanium systems studied. Significant differences are shown between the wear resistance of the six nickel plated alloys in the same lubricant, and the same may be said for the various cyanidedmore » titanium alloys. The best lubricants to use with cyanided titanium alloys are the same as for the untreated alloys; Halocarbon 11-14 is generally superior to polypropylene glycol 1025, while the lubricants normally used for steel and electroless nickel are definitely inferior to these two. The comparison of wear rates for two metals having widely different moduli of elasticity has been considered, and a method of handling the problem proposed. On this basis it is shown that the wear rate of the best electroless nickel- plated titanium alloys is equivalent to 52100 steel. Carburized iron-plated titanium was also investigated to a limited extent and found to give results approaching 52100 steel. (auth)« less
  • Corrosion Studies. Results of an extensive investigation of chloride stress corrosion testing of type 347 stainless steel steam generator tubing are presented. Experiments to determine the effect of corrosion on type 304 stainless steel with varying carbon content in reference primary coolant water are given. Van de Graaff studies were undertaken to determine what variables are involved in the phenomenon of preferential deposition of crud on fuel element surfaces. Calculated deposited crud activity in the Shippingport Pressurized Water Reactor primary system due to corrosion of core materials is given. An investigation of corrosion and crud deposition of Zircaloy surfaces undermore » nucleate boiling is given. Decontamination. Methods of decontamination of structural materials and surface coatings for use in nuclear installations are given. Analytical Instrumentation. The theory behind the design of a system for locating and detecting fuel element failure is presented. Materials Application. A brief summary is presented of the present status of development work intended to enable the substitution of ordinary carbon steel for stainless steel in primary and purification systems of pressurized water reactors. As a result of a fabrication development program a Zircaloy-2 tube was built to facilitate in-pile testing of reactor fuel elements. Mechanical properties of Co--Cr alloy bearing materials in compression at elevated temperatures are presented. Welding and Brazing. A standard seal weld machine is described which was designed to seal- weld all mechanisms, fuel ports, and instrument ports of a single reactor. (W.L.H.)« less
  • A comprehensive investigation of H/sub 2/ in Ti alloys was carried out. Tests were conducted to gain an insight into the mechanism of the slow-strain embrittlement of Ti alloys by H/sub 2/, and a tentative theory is presented. Eighty Ti alloys were examined in the stabilized condition to determine the effect of composition on the tendency toward H/sub 2/ embrittlement. The effect of microstructural variations on the tendency toward embrittlement was also studied. In addition to studying the effects of H/sub 2/ on the properties of Ti, factors affecting hydrogen pickup by Ti and methods of removing H/sub 2/ frommore » Ti were investigated. Included were investigations of low pressure solubility, degassing methods, and the pickup of H/sub 2/ from various atmospheres. (auth)« less
  • Additional specimens of carburized iron-plated titanium have been prepared and partially evaduated in the Shell Tester at 50-kg load. Although there have been some wide variations in the results obtained, even in the same balls, the results continue to show promise. One test in Mobil Oil SAE 30 at 50- kg load was finally discontinued after 240 hr with a final scar of less than 1 A mm diameter. Photomicrographs of the above specimens show the existence of an intermetalic layer between the iron and titanium phases about one-half mil thick. (For preceding period see NP-6390.) (auth)
  • A spectrographic method for the detection and determination of rare earth impurities in Y/sub 2/O/sub 3/ is described. Graphite electrodes are employed with a 1: 1 charge of sample to graphite powder. (C.J.G.)