By BARBARA LINKE
This monograph makes a speciality of abrasive instruments for grinding, sharpening, honing, and lapping operations. The e-book describes the lifestyles cycle of abrasive instruments from uncooked fabric processing of abrasive grits and bonding, production of monolithic or multi-layered instruments, instrument use to device end-of-life. in addition, this paintings highlights sustainability demanding situations together with monetary, environmental, social and technological points. the objective viewers basically contains examine and specialists within the box of producing, however the booklet can also be useful for graduate students.
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Extra resources for Life Cycle and Sustainability of Abrasive Tools
123]. g. vc = 63–125 m/s) [KLOC03]. In single grit scratching tests, a highly viscous oxide layer formed on the grit edge of sol-gel corundum [KLOC02]. This oxide layer presumably reduces the strain energy between the workpiece and the abrasive grit, so that friction coefﬁcient and grit wear are decreased [KLOC02]. 1 Silicon Carbide Chemistry, Types and Characteristics of Silicon Carbide Silicon carbide, also known as carborundum and SiC, is used as abrasive material in its hexagonal form, α-SiC (Fig.
SiC proves to be a good abrasive material for machining titanium and titanium alloys, despite the possible reactions in Eqs. 9 [KUMA84]. 4 Ti þ SiO2 þ ðO2 Þ ! TiO2 þ SiO2 ð2:8Þ Ti þ SiC þ ðO2 Þ ! TiC þ SiO2 ð2:9Þ Thermal Conductivity, Electric and Magnetic Properties The thermal conductivity of silicon carbide is comparatively high for a ceramic material with around 100 W/mK [ROWE09]. 1–1012 Ω cm depending on purity [LIET08]. 2 Manufacture of Silicon Carbide Silicon carbide (SiC) cannot be found in nature in sufﬁcient quality for technical applications [TYRO03b].
14). In grinding, this layer has supposedly a wear-inhibiting effect [KLOC09, p. 36]. 4BN þ 3O2 ! 2B2 O3 þ 2N2 ð2:14Þ Hydrolysis of CBN occurs above a temperature of 1000 °C (Eq. 15) [KLOC09, p. 36, MOSE80, p. 166]. It is presumed that this reaction needs longer contact times than present in grinding and is therefore not relevant for this technology [KLOC09, p. 36]. BN þ 3H2 O ! 4 ð2:15Þ Thermal Conductivity, Electric and Magnetic Properties Pure CBN is colorless and a good electrical insulator, but doping with Li3N, Be, Si, C, or P changes color, conductivity, and toughness [GREI06].