Tham khảo tài liệu 'compressor instability with integral methods episode 1 part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Chapter 2 Abrasive Materials Classification and Properties of Abrasive Materials A large number of different types of abrasive materials is available for blast cleaning applications. Most frequently applied abrasive materials are listed in Table . Table lists numerous physical chemical and technical properties of commercial abrasive materials. Basically there can be distinguished between metallic abrasive materials and non-metallic abrasive materials. The evaluation of an abrasive material for blast cleaning applications includes the following important parameters material structure material hardness material density mechanical behaviour particle shape particle size distribution average grain size. Abrasive Material Structure and Hardness Structural Aspects of Abrasive Materials Structural aspects of abrasive materials include the following features lattice parameters crystallographical group and symmetry chemical composition crystallochemical formula cleavage inclusions water-gas inclusion and mineral inclusion . A. Momber Blast Cleaning Technology Springer 2008 7 8 2 Abrasive Materials Table Annual abrasive consumption in the USA for blast cleaning processes Hansink 2000 Abrasive type Consumption in Mio. of tonnes Coal boiler slag Copper slag Garnet Hematite Iron slag Nickel slag Olivine Silica sand Staurolite zirconium Steel grit and steel shot Table lists typical values for some abrasive materials. Table displays a commercial technical data and physical characteristics sheet for a typical blast cleaning abrasive material. Abrasive particles contain structural defects such as microcracks interfaces inclusions or voids. Very often these defects are the result of the manufacturing process. Strength and fracture parameters of materials can be characterised through certain distribution types. A widely applied distribution is the Weibull distribution and it was shown by Huang
