摘要:

This review of electron diffraction theory and technique emphasizes its scope and limitations in the study of lubrication. The first section describes important areas of wear and friction studies where the electron diffraction method may be used, with examples chosen from the literature. Included in the discussion are: (a) monolayers, liquid lubricants, and greases, (b) polished and amorphous films, (c) the relation to wear of the crystallite size of surface phases, (d) possible relations between wear and the orientation of surface films, (e) solid lubricants, (f) mechanism of extreme pressure lubrication, and (g) the identification of wear debris.

ISSN:0569-8197    

DOI:10.1080/05698195808972345

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor

摘要:

The wear rate and friction characteristics were determined for certain combinations of cobalt base alloys and stainless steels when rubbed together at unit pressures up to 300,000 psi in an environment of demineralized water at room temperature. Wear rate and friction data were collected both in the presence and absence of wear particles. A study was also made on the effect of sliding-surface geometry in trapping wear particles.

ISSN:0569-8197    

DOI:10.1080/05698195808972346

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor

摘要:

Results of wear tests in clean water at room temperature and at 500F are presented. The differences in result with 0.08 in. diameter and line contact riders and with much larger riders are shown. The contact stress range is from 10 psi to 9000 psi for large contact areas and from 3000 psi to over 100,000 psi for small contact areas. The majority of the testing is at a linear velocity of about 2 in. per sec. The concept of wear per unit load and per unit distance traveled for a unit wear area is used for converting sliding wear data from various test machines to a common basis for comparison. The same concept can be used for calculating from wear data the expected wear in a new design. The range and trend of friction values encountered in some of the tests is presented.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in Toronto, October, 1957.

ISSN:0569-8197    

DOI:10.1080/05698195808972347

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor

摘要:

A radioactive tracer, phosphorus-32 synthesized into zinc dialkyl dithiophosphate molecules, was used to study the EP films formed by this motor oil additive on cast iron cams and tappets. The tightly bound films, which contain phosphorus and zinc, formed rapidly and then approached steady-state values in static and dynamic tests. The amount of film increased with oil temperature (200 to 300F) and with available surface area. Dynamic test conditions greatly increased the amount of film formed, indicating the marked effect of surface temperature, pressure or wear. The film is maintained on parts run in additive oil; moreover, the film was not easily worn off in non-additive oil. The chemical and physical properties of the films appeared to vary with the conditions of film formation. Radioactive counting was used to determine the film on tappets and the thermal stability of the compounded oil. Autoradiographs showed the concentration and distribution of the film on cams and tappets.Contributed by the ASLE Technical Committee on Lubrication Fundamentals and presented at the Annual Meeting of the American Society of Lubrication Engineers held in Cleveland, Ohio, April, 1958.

ISSN:0569-8197    

DOI:10.1080/05698195808972348

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor

摘要:

It is now well known that certain types of cemented carbides give excellent results when used to cut cast irons but poor results when used to cut steels and vice versa. This relative ability of a given tool material to perform well when cutting a given workpiece material is referred to here as compatibility.

ISSN:0569-8197    

DOI:10.1080/05698195808972349

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor

摘要:

1Published inASLE Transactionsv. 1, n. 1, April, 1958.

ISSN:0569-8197    

DOI:10.1080/05698195808972350

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor