Slurry erosion properties of ceramic coatings

✍ Scribed by H.X Zhao; A Yabuki; M Matsumura; T Takahashi; M Yamamoto

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 479 KB
• Volume: 233-235
• Category: Article
• ISSN: 0043-1648
• DOI: 10.1016/s0043-1648(99)00238-0

✦ Synopsis

The effectiveness of ceramic coatings on pump impellers used in the acidic gypsum-fly ash slurry environments in desulphurisers was assessed by using two kinds of slurry erosion tester. The experimental results from the two testers did not always coincide, although in general they did. The possible reasons and the implications of this distinction between the two testers were discussed, and the following Ž . conclusions were reached: 1 Generally, although ceramic coatings, in particular Cr O and Al O , have much improved slurry erosion

resistance, the resistance of ceramic coatings to slurry-erosion is closely related to the techniques of plasma spraying. At optimum Ž . Ž. Ž . manufacturing conditions, ceramic coatings are about two times as resistant as the base metal SUS329J1 ; 2 Vicker's hardness H is v Ž . an effective parameter for the assessment of slurry erosion properties of ceramic coatings, as well as bulk ceramics; 3 The most deleterious environment for slurry pumps used in desulphurisers is pure fly ash, therefore, fly ash should be removed as much as possible before desulphurising in thermal power plants.