Ispitivanje svojstava bakrene i aluminijske legure i njihova spoja za primjenu u elektrotehnici

undergraduate thesis

• Author: Dario Mašinović
• Mentor: Zdenka Zovko Brodarac (mentor)
• Mentor: Anita Begić Hadžipašić (sumentor)
• Committee member: Ljerka Slokar (predsjednik povjerenstva)
• Committee member: Zdenka Zovko Brodarac (član povjerenstva)
• Committee member: Anita Begić Hadžipašić (član povjerenstva)
• Committee member: Stjepan Kožuh (član povjerenstva)
• Committee member: Natalija Dolić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Metallurgy; Sisak
• Defense date and country: 2016-09-08, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Metallurgy; Process Metallurgy

Abstract

Za izradu elektrotehničkih proizvoda na raspolaganju su brojni materijali koji se razlikuju po
sastavu i podrijetlu: osnovni kemijski elementi, kemijski spojevi, legure te umjetni spojevi i
složeni materijali. U elektrotehničkim spojevima najčešće se upotrebljavaju meke bakrene i
gnječive aluminijske legure visoke čistoće. Dobra svojstva aluminija i njegovih legura kao
vodljivog materijala su: visoka električna i toplinska vodljivost, mala specifična masa, dobra
tehnološka i mehanička svojstva, kemijska postojanost i otpornost na električni luk.
Električna provodljivost ovisi o postotku primjesa i nečistoća te o stupnju plastične
deformacije i rekristalizacije tijekom proizvodnje. Specifičnost spojeva visokovodljivih
legura poput legura aluminija i bakra je potencijalna opasnost od nastajanja galvanskih
članaka. Stoga spajanje aluminija i bakra uobičajenim metodama zavarivanja nije dopušteno
jer se u prisustvu vlage stvara galvanski članak koji uzrokuje elektrokemijsku koroziju, pri
kojoj aluminij kao anoda nestaje. U ovom je radu ispitana Cu/Al spojnica za primjenu u
dalekovodima. Proizvod čini spoj legure mekog bakra Cu-ETP (CW004A) i gnječive
aluminijske legure EN AW-1050A. Slijedom navedenog je za spajanje primijenjena metoda
zavarivanja trenjem. Cilj ovog istraživanja bio je utvrditi mikrostrukturna svojstva materijala
bakrene i aluminijske legure te njihova spoja i korelirati ih s utjecajem simuliranih
tehnoklimatskih uvjeta u mediju umjetne kiše i 3,5% otopine NaCl.

Abstract (english)

Numerous materials which are available for manufacturing electro technical products differ in
contexture and origin: basic chemical elements, chemical compounds, alloys, artificial
compounds and complex materials. High purity soft copper and compressible aluminium are
mostly used materials in electro technical compounds. Good properties of aluminium and its
alloys as a conductible material are: high electrical and thermal conductivity, small specific
mass, good technological and mechanical properties, chemical stability and resistance to arc
discharge. Copper has the best electrical and thermal conductivity. Electrical conductivity
depends on the percentage of admixtures and impurities as well as the rate of plastic
deformation and recrystallization during the process of manufacturing. The feature of high
conductive compound alloys like aluminium and copper is the possibility of galvanic cells
formation. Therefore, the merging aluminium and copper by usual welding methods is not
allowed due to electrochemical corrosion which causes the deterioration of aluminium as an
anode in galvanic cell and humid conditions. The Cu/Al joint usage in power lines is tested in
this paper. Product makes a compound of soft copper alloy Cu-ETP (CW004A) and
compressible aluminium alloy EN AW-1050A. For merging of the aforementioned, friction
welding (FRW) method was used. The aim of this research was to determine microstructural
properties of copper and aluminium alloys and their joint, and to correlate them with the
effect of simulated techno chemical conditions in the ambient of artificial rain and 3,5% NaCl
solution.

• Keywords: bakar; aluminij; zavarivanje trenjem; mikrostruktura; korozijska otpornost
• Keywords (english): copper; aluminium; friction welding; microstructure; corrosion resistance
• Language: croatian
• URN:NBN: urn:nbn:hr:115:843908
• Study programme: Title: Metallurgy; specializations in: Metallurgical Engineering, Industrial Ecology; Course: Metallurgical Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka metalurgije (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka metalurgije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2016-09-30 09:40:48