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  • 1
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 249-254 
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Oxide coatings offer great potential for their use in forming operations in the semi-solidstate. Advantages of these types of coatings are high resistance against abrasive wear, high hothardness and low thermal conductivity. Nevertheless deposition by pulsed Magnetron Sputter IonPlating-PVD for oxide coatings is quite challenging: deposition rates are low and insulating layerson the target surface can cause arcing. On laboratory scale it was possible to deposit γ-Aluminausing PVD in a temperature range, where hot working steel can be utilized. The next important stepin the development towards an industrial application for larger forming tools is the upscalingprocess to larger coating units. In this work the process development of oxide coatings on anindustrial coating unit for large tools was described. To increase adhesion of oxide top-layeradditional bond coats were applied. Different process parameters like oxygen content, total pressureand substrate bias were varied, to improve the performance. The relationship between coatingproperties and process parameters of the deposited films were characterized by X-Ray-diffraction,Nanoindentation and Scanning Electron Microscopy (SEM). By using reactive pulsed PVD-processit was possible to deposit γ-Al2O3 on large steel tools for semi-solid melt protection. The developedcoatings showed for thixoforging processes of X210CrW12 an extraordinary stability in field tests.The lifetime of the permanent moulds was increased by using PVD thin film coatings as a toolprotection
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 116-117 (Oct. 2006), p. 704-707 
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The process of semi solid metal forming with permanent moulds combines the advantagesof the process technologies casting and forging. Semi solid metal forming of steel is a challenge withrespect to very high thermal, mechanical and tribological stresses of tools. Alumina based ceramicsshow a very high potential for tool protection. Alumina occurs in different known meta stable phases.First experiments show that the high temperature γ-phase exhibits high strength and toughness.Various methods and technologies have examined γ-phase stabilisation by using different thin filmprocess technologies. By using Physical Vapor Deposition (PVD) it was possible to depositγ-Alumina in a temperature range, where hot working steel can be utilized. The properties of the bypulsed reactive magnetron sputtering deposited films were analyzed by common thin film techniquesrevealing hardness, Young´s modulus and coating adhesion. By using the reactive pulsedPVD-process it was possible to stabilize γ-Al2O3 on steel substrates for semi-solid melt protection.The γ-Al2O3 coatings showed an extra ordinary stability for thixoforging of X210CrW12 and 100Cr6in field tests. The durability of the permanent moulds was increased by using PVD thin film coatingsas a tool protection
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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