Istraživanje mogućnosti boriranja površina tvrdih metala

undergraduate thesis

• Title (english): Investigation of hard metals' surfaces boriding potential
• Author: Antonio Stepić
• Mentor: Božidar Matijević (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2019-02-28, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

U radu su opisana mehanička svojstva i kemijska postojanost tvrdih metala. Prikazan je detaljan pregled inženjerstva površina tvrdih metala. Navedene su prednosti i nedostaci najučestalijih postupaka prevlačenja tvrdih metala. Dan je i prikaz dosad istraženih radova u području modificiranja površine tvrdih metala. Opisan je postupak boriranja s naglaskom na boriranje u praškastom mediju. U eksperimentalnom dijelu rada korišteni su uzorci WC-Co tvrdih metala koji su podvrgnuti toplinskoj obradi otplinjavanja, a zatim i boriranja u praškastom mediju u Laboratoriju za toplinsku obradu Fakulteta strojarstva i brodogradnje Sveučilišta u Zagrebu. Priprema uzoraka za metalografsku analizu i analiza mikrostrukture pod svjetlosnim mikroskopom izvršena je u Laboratoriju za materijalografiju Fakulteta strojarstva i brodogradnje Sveučilišta u Zagrebu. Kemijska analiza uzoraka izvršena je u Laboratoriju za elektronsku mikroskopiju Fakulteta kemijskog inženjerstva i tehnologije Sveučilišta u Zagrebu. Ispitivanjem je utvrđena neznatna promjena mikrostrukture nakon boriranja u odnosu na početno stanje te na površini nije potvrđen nastanak boridnog sloja.

Abstract (english)

This paper describes mechanical properties and chemical resistance of cemented carbides. A detailed overview of surface engineering of cemented carbides is given. The paper also lists the advantages and disadvantages of the most common coating technologies. A review of previous research on the modification of cemented carbides is provided. The boriding process with emphasis on boriding in powder is described. In the experimental part of the paper samples of WC-CO cemented carbide were used. They were subjected to heat treatment containing degasification and boriding at the Heat Treatment Laboratory of the Faculty of Mechanical Engineering and Naval Architecture of the University of Zagreb. Surface preparation for metallographic analysis and microstructure analysis using light microscope were performed at the Metallography Laboratory of the Faculty of Mechanical Engineering and Naval Architecture of the University of Zagreb. Chemical composition analysis of the samples was performed at the Electron Microscopy Laboratory of the Faculty of Chemical Engineering and Technology of the University of Zagreb. The examinations of the samples revealed insignificant microstructure modification after boriding compared to the initial state and no boriding layer was created on surface.

• Keywords: tvrdi metali; WC-Co; inženjerstvo površina; modificiranje površina; bor; boridni sloj
• Keywords (english): cemented carbide; WC-Co; surface engineering; surface modification; boron; boriding layer
• Language: croatian
• URN:NBN: urn:nbn:hr:235:291626
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2019-05-23 00:28:11