| Title: | Erosion of materials by alumina slurry |
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| Authors: | ID Lou, Hong Qing (Author)
ID Križman, Alojz (Author) |
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| Files: |  http://dx.doi.org/10.1016/0043-1648(89)90129-4
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| Language: | English |
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| Work type: | Unknown |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | FS - Faculty of Mechanical Engineering
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| Abstract: | An examination of the erosion resistance of materials utilized in the construction of alumina pumps was carried out. This included laboratory research and, for the purpose of verification, investigation under actual service conditions. In this paper the effect of material properties on erosion resistance is considered. In the second paper the influence of phase properties and conditions of multiphase materials on material erosion resistance will be described. The results from studies of the seven most frequently utilized and recommended materials show that the erosion resistanceof candidate materials increases to a maximum and, then, decreases with decreasing material hardness. Surface examination reveals that ductile and brittle erosion mechanisms operate on the eroded surfaces of ductile and brittle materials respectively. Fracture toughness is a dominant factor for brittle materials, while hardness is a main factor for ductile materials. Under certain external conditions pump materials should be hard enough to resist material loss by ductile erosion mechanisms and should have sufficient fracture toughness to resist material loss by brittle erosion mechanisms. On the basis of the present work a schematic drawing is constructed to explain irregular patterns in the relation between resistance to material erosion and material hardness in previous works through simultaneous examination of hardness and fracture toughness.The first part of this work Erosion of materials by alumina slurry - part 1 has stated that the erosion resistance of materials in alumina pumps is connected with material properties such as hardness and fracture toughness. Part 2 investigates the erosion mechanisms of multiphase materials. Research into the erosion mechanisms of eroded surfaces as well as microstructural change below the eroded surface led to more thorough analysis of two characteristic wear-resistant materials (Norihard, Fonte30%Cr) and a relatively less resistant material, mottled iron. Material removal processes in different phases of multiphase materials are different, asynchronous and interactive. The erosion mechanisms of material removal from the matrices of different materials differ owing to their dependence on the matrix-phase properties and microstructure of the material. The modes of material removal of mottled iron and Norihard are established. A model of the erosion rate of material with a multiphase microstructure was proposed. In the case of pump elements for alumina slurry in an alkaline medium, a ductile matrix with sufficient hardness is important for higher erosion resistance. The erosion resistance is also affected by the size, shape and proportion of other microstructural components. |
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| Year of publishing: | 1989 |
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| PID: | 20.500.12556/DKUM-35116  |
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| UDC: | 620.19 |
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| ISSN on article: | 0043-1648 |
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| COBISS.SI-ID: | 9492246 |
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| NUK URN: | URN:SI:UM:DK:19WCFZQV |
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| Publication date in DKUM: | 06.06.2012 |
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| Views: | 1736 |
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| Downloads: | 29 |
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| Metadata: |    |
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| Categories: | Misc.
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