Tham khảo tài liệu 'abrasive materials_5', kỹ thuật - công nghệ, điện - điện tử phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Process Behaviour of Abrasive Particles 47 Disintegration Numbers Gommel 1967a introduced a so-called shatterability a parameter which quantifies the particle fragmentation during the impingement on a substrate. It was shown that shatterability depended on substrate hardness and impact velocity. If substrate hardness and impact velocity increased shatterability increased. However particle fragmentation was independent of impact velocity if the substrate hardness approached the hardness of the abrasive particle material Gommel 1967a . Ohlsen 1997 introduced a disintegration number as follows . dPout D 1 V 0 1 If ỘD 0 no disintegration of the particles occurs. The particle size parameter can be substituted by the particle parameters discussed in Sect. for example by dP50. Results based on steel shot tests are displayed in Fig. . The disintegration numbers are rather low pointing to a high size stability of the particles. It can also be noted that the disintegration number depended on the number of impact cycles but also on the hardness of the target material. For the soft target material the disintegration number was almost one order of magnitude larger than for the Fig. Effects of number of impacts and target material hardness on the disintegration number based o the sieve curves displayed in Fig. 48 2 Abrasive Materials number of impact cycles Fig. Effects of number of impacts and abrasive particle size on the disintegration number calculation is based on results reported by Hareux and Riac 1986 Fig. Effects of number of impacts and nozzle type on the disintegration number calculation is based on results reported by Hareux and Riac 1986 Process Behaviour of Abrasive Particles 49 hard target material. Figure illustrates the effect of the particle size of a slag material on its disintegration number. As could be expected from the results of the previous sections disintegration number increased with an increase in .
