Utjecaj veličine abrazivnih čestica na intenzitet abrazijskog trošenja aluminij-oksidne keramike

undergraduate thesis

• Title (english): Effect of abrasive grain size on the abrasive wear rate of alumina cermics
• Author: Stjepan Vargek
• Mentor: Vera Rede (mentor)
• Committee member: Vera Rede (predsjednik povjerenstva)
• Committee member: Dragutin Lisjak (član povjerenstva)
• Committee member: Miro Hegedić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2020-02-28, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Basic Technical Sciences; Materials

Abstract

U ovom radu ispitan je utjecaj veličine abrazivnih čestica na intenzitet abrazijskog trošenja aluminij-oksidne keramike dobivene postupkom hladnog izostatičkog prešanja i naknadnim sinteriranjem. Otpornost na abrazijsko trošenje ispitana je s različitim veličinama abrazivnih zrna, a na temelju dobivenih rezultata određena je i kritična veličina abrazivnog zrna. Također je izmjerena mikrotvrdoća te je analizirana mikrostruktura aluminij-oksidne keramike. Izmjerena mikrotvrdoća iznosila je 1810 HV1. Gustoća keramičkih uzoraka iznosila je 3,843 g/cm3, a poroznost 3,588%. Trošenjem na Taber abraderu s različitim granulacijama brusnog papira dobiveni su rezultati koji su ukazivali na pojavnost kritične veličine abrazivnog zrna, čija je vrijednost između 46,2 μm i 68 μm. Intenzitet trošenja linearno raste s porastom abrazivnih čestica do kritične veličine abrazivnog zrna, a s daljnjim porastom abrazivnih čestica, intenzitet trošenja opada.

Abstract (english)

In this paper, the effect of abrasive particle size on the abrasive wear intensity for aluminumoxide ceramics obtained by cold isostatic pressing and subsequent sintering was examined. The
abrasion resistance was tested with different sizes of abrasive grains, and based on the results
obtained, the critical size of the abrasive grain was determined. The microhardness was also
measured and the microstructure of aluminum oxide ceramics was analyzed.
The measured microhardness was 1810 HV1. The density of the ceramic samples was 3.843 g /
cm3 and the porosity was 3.588%. Wear testing on a Taber abrader with different sandpaper
granulations yielded results that indicated the occurrence of a critical abrasive grain size of
between 46.2 µm and 68 µm. The wear intensity increases linearly with the increase of the
abrasive particles to the critical size of the abrasive grain, and with the continued increase of the
abrasive particles, the wear intensity decreases.

• Keywords: kritična veličina abrazivnog zrna; intenzitet trošenja; aluminij-oksidna keramika
• Language: croatian
• URN:NBN: urn:nbn:hr:235:668070
• 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: 2020-02-27 07:59:50