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Mätning av restspänning i kromoxid: En jämförelse mellan krom och kopparstrålning i röntgendiffraktion
Karlstad University, Faculty of Health, Science and Technology (starting 2013).
2019 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Measurement of residual stress in chromium oxide coating : A comparison between Cr and Cu X-ray diffraction (English)
Abstract [en]

A doctor blade among other applications is used in the paper industry, were its main purpose is to separate paper sheet from a drying cylinder. During spraying, the blade is exposed to wear by its continuous contact with the moving cylinder. The blade has been sprayed with a chromium oxide coating to withstand wear. During the application of the coating, residual stresses are built in, which influence the doctor blade performance. One method to determine residual stresses is to use X-ray diffraction, were the choice of X-ray source is crucial for receiving good measurement results. This thesis covers a comparison if a chromium or a copper X-ray source will give the best results when determining of residual stresses in the doctor blade. The thesis also includes measurement of residual principal stresses and their directions in the doctor blade in different conditions. The result show that copper as the X-ray source, and the 2𝜃 diffraction peak at 125° proved to be the best choice. The largest principal stress was found in the doctor blade directly following the plasma spraying of the coating. The stress was measured to 122,6 𝑀𝑃𝑎 and the direction was orthogonal to the blades longer side.

Abstract [sv]

Ett schaberblad används bland annat inom pappersindustrin där dess huvudsakliga uppgift är att separera pappersmassa från en torkcylinder. Bladet utsätts för nötning och har försetts med en belagd yta av kromoxid. Under appliceringen av kromoxid skiktet byggs det inre spänningar som förkortar livslängden. En metod för att undersöka restspänningar är röntgendiffraktion där val av strålkälla är avgörande för resultatet. I denna examensuppsats jämfördes det mellan koppar och krom om vilken strålkälla som gav bäst resultat vid mätning av restspänningar i kromoxid. En vidare undersökning utfördes för att mäta storlek och riktning av huvudspänning på schaberblad i olika tillstånd från tillverkningsprocessen. Koppar visade sig ge bättre resultat i kromoxid då bakgrundsstrålningen var lägre, mindre spridning av mätdata och dess diffraktionstopp befann sig över 125°. Störst restspänning visade sig det blad ha vars tillstånd var endast plasmasprutad, vilket uppmättes till 123 𝑀𝑃𝑎 med riktning ortogonal mot bladets långsida.

 

Place, publisher, year, edition, pages
2019. , p. 44
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-74528OAI: oai:DiVA.org:kau-74528DiVA, id: diva2:1346415
External cooperation
Voelstalpine Precision Strip AB
Subject / course
Mechanical Engineering
Educational program
Engineering: Mechanical Engineering, spec. in Materials Engineering (300 ECTS credits)
Presentation
2019-06-05, 21A347, Universitetsgatan 1, Karlstad, 18:03 (Swedish)
Available from: 2019-09-10 Created: 2019-08-27 Last updated: 2019-09-10Bibliographically approved

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