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-acidophilic bioleaching of chalcopyrite containing ball mill spillage and removal of the surface passivation layer [J]. Bioresource Technology, 2013, 130: 332-338. [10] HU Y H, QIU G Z, WANG J, WANG D Z......
process, in an attempt to induce grain refinement on the top surface layer of the sample. First, the stainless steel ball with a diameter of 0.20 mm was taken as the projectile, and the gas pressure......
. The roller bearing working frequency is 12 kHz. Normal (NR), ball fault (BF), inner race fault (IRF), and outer race fault (ORF), these four types of fault under different fault diameters of 0.1778 mm (1hp......
by the impact of a small ball at one end of the sample, and the signal was recorded using a commercial microphone, a system of amplification and a digital oscilloscope. 3 Results and discussion......
of coatings at room temperature was tested by using a ball-on-disk tribometer (THT-1000) under dry friction condition. The Al2O3 ball with a diameter of 6 mm was used as the friction pair because of its......
material (using planetary ball mill RM 100) to a fraction of 100 μm, which ensures the maximum contact degree in the Al-Si system. Upon the completion of the preparatory operations, the mixture......
intervals up to 168 h, then evaluating the corresponding hardness variation. Brinell hardness tests were carried out with 2.5 mm ball and 62.5 kg load, according to the ASTM E 10-18 standard [12......
Rockwell hardness tester with a load of 980 N equipped with a steel ball indenter with a diameter of 12.7 mm. The compressibility tests were conducted on a model 1620 compression machine manufactured......
of Ti70.5Fe29.5, Ti64.51Fe26.40Zr5.86Sn2.93Y0.30 and Ti- 6Al-4V were prepared by arc-melting in an argon atmosphere, and then were ground into powder with size of 30-100 mm by ball grinder, which were chosen as LAM... friction- wear test was performed using a CETR UMT-2 testing machine. A Si3N4 ball with a diameter of 5.96 mm and a hardness of HV 1500 was selected as the wear couple. The corrosion behavior......
objects). For example, a person can hit both a racket (musical instrument) and a sports ball (direct object). The datasets we use are shown in Figure 5. 5.2 Evaluation metric We primarily use mean......
