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    Mechanism of Mild to Severe Wear Transition in Alpha-Alumina

    Source: Journal of Tribology:;1992:;volume( 114 ):;issue: 003::page 403
    Author:
    S. Jahanmir
    ,
    X. Dong
    DOI: 10.1115/1.2920899
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Friction and wear experiments were conducted on high purity alpha-alumina sliding against a similar material in air under different contact loads and at temperatures ranging from 23°C to 900°C. Experimental results indicate that tribochemical reactions between water vapor and alpha-alumina at room temperature produce aluminum hydroxide which results in relatively low coefficients of friction and low wear rates. Both the coefficient of friction and the wear rate of alumina were low at intermediate temperatures (200°C to 800°C), if the contact stress was below a threshold value. Above this load, wear occurred by fracture, the wear coefficient exceeded a value of 10−4 , and the coefficient of friction increased to 0.90. At 900°C, the coefficient of friction was 0.40 and the wear coefficient was reduced to a value less than 10−6 , because of the formation of a silicon-rich layer on the wear track. A contact mechanics model based on linear elastic fracture mechanics indicated that propagation of cracks from pre-existing flaws controls the onset of catastrophic wear in the intermediate temperature range.
    keyword(s): Wear , Mechanisms , Friction , Temperature , Stress , Contact mechanics , Fracture (Process) , Crack propagation , Silicon , Tribochemistry , Water vapor , Aluminum AND Fracture mechanics ,
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      Mechanism of Mild to Severe Wear Transition in Alpha-Alumina

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/110908
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    contributor authorS. Jahanmir
    contributor authorX. Dong
    date accessioned2017-05-08T23:39:39Z
    date available2017-05-08T23:39:39Z
    date copyrightJuly, 1992
    date issued1992
    identifier issn0742-4787
    identifier otherJOTRE9-28497#403_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/110908
    description abstractFriction and wear experiments were conducted on high purity alpha-alumina sliding against a similar material in air under different contact loads and at temperatures ranging from 23°C to 900°C. Experimental results indicate that tribochemical reactions between water vapor and alpha-alumina at room temperature produce aluminum hydroxide which results in relatively low coefficients of friction and low wear rates. Both the coefficient of friction and the wear rate of alumina were low at intermediate temperatures (200°C to 800°C), if the contact stress was below a threshold value. Above this load, wear occurred by fracture, the wear coefficient exceeded a value of 10−4 , and the coefficient of friction increased to 0.90. At 900°C, the coefficient of friction was 0.40 and the wear coefficient was reduced to a value less than 10−6 , because of the formation of a silicon-rich layer on the wear track. A contact mechanics model based on linear elastic fracture mechanics indicated that propagation of cracks from pre-existing flaws controls the onset of catastrophic wear in the intermediate temperature range.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleMechanism of Mild to Severe Wear Transition in Alpha-Alumina
    typeJournal Paper
    journal volume114
    journal issue3
    journal titleJournal of Tribology
    identifier doi10.1115/1.2920899
    journal fristpage403
    journal lastpage411
    identifier eissn1528-8897
    keywordsWear
    keywordsMechanisms
    keywordsFriction
    keywordsTemperature
    keywordsStress
    keywordsContact mechanics
    keywordsFracture (Process)
    keywordsCrack propagation
    keywordsSilicon
    keywordsTribochemistry
    keywordsWater vapor
    keywordsAluminum AND Fracture mechanics
    treeJournal of Tribology:;1992:;volume( 114 ):;issue: 003
    contenttypeFulltext
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