An Investigation of Methods to Improve the Wear Resistance of Gas-Bearing Ceramic Materials

1968 ◽  
Vol 90 (4) ◽  
pp. 829-838
Author(s):  
H. H. Rowe
Keyword(s):  
Wear Resistance ◽  
Chemical Vapor ◽  
High Hardness ◽  
Ceramic Materials ◽  
Gold Plating ◽  
Good Surface ◽  
Irradiation Treatment ◽  
Vapor Deposition Technique ◽  
Good Surface Finish ◽  
Gas Bearing

Ceramic materials, or more particularly aluminum oxides, have found application as a practical gas-bearing material because of the dimensional stability, low coefficient of friction, high hardness, and ability to attain good surface finish that these materials possess. This paper reports on an investigation of a number of methods designed to improve the resistance of aluminum oxide to damage from sliding contact, and hence improve the start-stop life characteristics of gas-bearing assemblies. These methods include heat-treatment, neutron irradiation treatment, gold plating, and coating of alumina surfaces by means of a chemical vapor deposition technique, in order to increase the wear resistance of the material. A brief mention is also made of the effect of machining techniques as they relate to the finish, and hence to the wear resistance, of gas-bearing parts.

scholarly journals Formation of wear resistant coatings on aluminum alloys by chromium deposition from gas-phase organometallic compounds

2016 ◽  
Vol 1 (2) ◽  
pp. 34-38 ◽  
Author(s):  
В Александров ◽  
V Aleksandrov ◽  
М. Морщилов ◽  
M. Morshchilov
Keyword(s):  
Wear Resistance ◽  
Substrate Temperature ◽  
Gas Phase ◽  
Chemical Vapor ◽  
High Hardness ◽  
Organometallic Compounds ◽  
Deposition Process ◽  
Amorphous Structure ◽  
Decomposition Temperature ◽  
Evaporator Temperature

The method of coatings producing by chemical vapor deposition from gas phase by pyrolysis of organometallic com-pounds of chromium on the aluminum alloy AL9 is described. For the research the “Barhos” liquid with bis-arene chromium organic compounds, containing bis-ethylbenzene chromium (322 ºC boiling point, decomposition temperature of the metal is 330 ºC), was selected. The chromium content in the liquid is not less than 16%.The deposition process depends on the gas-phase chromium: substrate temperature, reactor pressure, evaporator temperature, process duration. The deposition temperature (substrate temperature) is one of the major factors in the formation of coatings. It is determined, that the pyrolytic chromium coatings are characterized by high hardness (up to 16000 MPa) and wear resistance due to the amorphous structure, which allows them to improve the wear resistance of rubbing parts.

scholarly journals Synthesis of Multilayered DLC Films with Wear Resistance and Antiseizure Properties

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2300
Author(s):  
Yucheng Li ◽  
Jun Enomoto ◽  
Yuki Hirata ◽  
Hiroki Akasaka ◽  
Naoto Ohtake
Keyword(s):  
Wear Resistance ◽  
Chemical Vapor ◽  
High Hardness ◽  
Barrier Properties ◽  
Multilayered Film ◽  
Gas Barrier ◽  
Dlc Film ◽  
Cu Films ◽  
Industrial Sectors ◽  
Cu Film

Diamond-like carbon (DLC) films have attracted considerable interest for application as protective films in diverse industrial parts. This is attributed to their desirable characteristics, such as high hardness, low coefficient of friction, gas-barrier properties, and corrosion resistance. Antiseizure properties, in addition to wear resistance, are required during the die molding of polymer and polymer-matrix composite parts. Graphite films can be easily peeled because the vertically stacked graphene sheets are bonded via weak van der Waals forces. The present study demonstrates the fabrication of multilayered DLC/Cu films, where the Cu film functions as a catalyst for the formation of a graphite-like layer between the DLC and Cu films. The DLC/Cu film was synthesized on a Si (100) substrate via plasma-enhanced chemical vapor deposition and magnetron sputtering. The peelability, wear resistance, microstructure, texture, and cross-section of the film were experimentally analyzed. The results indicated a variation in the peelability with the deposition conditions of the Cu film that comprised particles with diameters of several nanometers. The DLC film at the interface in contact with the Cu film was transformed into a graphite-like state i.e., graphitized. The surface of the multilayered film exhibited antiseizure properties with the peeling of the upper DLC film. The multilayered film also exhibited wear resistance owing to the repeated appearances of a new DLC film. It is expected that the wear-resistant films with antiseizure properties demonstrated in the present study will be utilized in various industrial sectors.

REYNOLDS 390 and A390

Alloy Digest ◽  
1971 ◽  
Vol 20 (8) ◽  
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
High Hardness ◽  
Heat Treating ◽  
Silicon Alloys ◽  
Aluminum Silicon Alloys ◽  
Temperature Performance

Abstract REYNOLDS 390 and A390 are hypereutectic aluminum-silicon alloys having excellent wear resistance coupled with good mechanical properties, high hardness, and low coefficients of expansion. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fatigue. It also includes information on high temperature performance and corrosion resistance as well as casting, heat treating, and machining. Filing Code: Al-203. Producer or source: Reynolds Metals Company.

CONTINUOUS-CAST 45-12 DUCTILE IRON

Alloy Digest ◽  
1989 ◽  
Vol 38 (4) ◽  
Keyword(s):  
Continuous Casting ◽  
Ductile Iron ◽  
Heat Treating ◽  
Grain Structure ◽  
Continuous Cast ◽  
Good Surface ◽  
Fine Grain ◽  
High Speeds ◽  
Good Surface Finish ◽  
Iron Grade

Abstract Ductile Iron grade 45-12 produced by continuous casting has consistent density and fine grain structure. It is the softest of the regular grades of ductile iron and it machines at high speeds with good surface finish. This datasheet provides information on composition, physical properties, microstructure, hardness, elasticity, and tensile properties. It also includes information on heat treating, machining, and joining. Filing Code: CI-58. Producer or source: Federal Bronze Products Inc..

HOWMET No. 3

Alloy Digest ◽  
1968 ◽  
Vol 17 (10) ◽  
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Base Alloy ◽  
High Hardness ◽  
Heat Treating ◽  
High Heat ◽  
Cobalt Base Alloy ◽  
Metal Products ◽  
Cobalt Base

Abstract HOWMET No. 3 is a cobalt-base alloy having high hardness and compressive strength, high heat and corrosion resistance, along with excellent abrasion and wear resistance. It is recommended for bushings, scrapers, valve parts, and other machinery components. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: Co-56. Producer or source: Howmet Corporation Metal Products Division.

DOUBLE SEVEN

Alloy Digest ◽  
1962 ◽  
Vol 11 (9) ◽  
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
Physical Properties ◽  
Cold Working ◽  
High Hardness ◽  
Heat Treating ◽  
Heavy Duty ◽  
High Carbon ◽  
Die Steel ◽  
High Chromium

Abstract DOUBLE SEVEN is an air hardening high-carbon high-chromium tool and die steel having high hardness and wear resistance. It is recommended for shear blades, cold working tools, and heavy duty dies. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: TS-124. Producer or source: Edgar Allen & Company Ltd, Imperial Steel Works.

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