Vestnik of Samara State Technical University. Technical Sciences SeriesVestnik of Samara State Technical University. Technical Sciences Series1991-85422712-8938Samara State Technical University1961910.14498/tech.2011.3.%uResearching of silver covered thrust collar's structure and properties for drill bitsRassudovaValentina Nаспирант; Самарский государственный технический университет; Samara State Technical Universityvalentina.rassud@mail.ruSamara State Technical University1509201119311612110022020Copyright © 2011, Samara State Technical University2011Making investigations of metallographic characteristics, chemistry, hardness of basic material and silver cover of drill bit's thrust collar.thrust collarsdrill bitscoversbronzemicrostructurewear resistanceупорные шайбыбуровые долотапокрытиябронзамикроструктураизносостойкость