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Abrasive Materials_1

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Bìa cứng: 351 trang Nhà xuất bản: Noyes Pubns (tháng 7 năm 1981) Ngôn ngữ: Tiếng Anh ISBN-10: 0815508514 ISBN-13: 978-0815508519 Trung bình khách hàng Đánh giá: Hãy là người đầu tiên đánh giá mặt hàng này Amazon Sản phẩm bán chạy: # 7043364 trong Sách (Xem Top 100 trong Sách) | Chapter 2 Abrasive Materials 2.1 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 2.1. Table 2.2 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. 2.2 Abrasive Material Structure and Hardness 2.2.1 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 2.1 Annual abrasive consumption in the USA for blast cleaning processes Hansink 2000 Abrasive type Consumption in Mio. of tonnes Coal boiler slag 0.65 Copper slag 0.1-0.12 Garnet 0.06 Hematite 0.03 Iron slag 0.005 Nickel slag 0.05 Olivine 0.03 Silica sand 1.6 Staurolite zirconium 0.08-0.09 Steel grit and steel shot 0.35 Table 2.3 lists typical values for some abrasive materials. Table 2.4 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