A novel approach of mechanical chemical grinding

Yuan

Lyu

et al. 2017

Plasma Sci. Technol.

Uniform diamond films are highly desirable for cutting industries, due to their high performance and long lifetime used on cutting tools. Nevertheless, they are difficult to obtain on cutting tools with complicated shapes, greatly limiting the applications of diamond films. In this study, a novel approach of deposition for uniform diamond films is proposed, on circular saw blades made of cemented carbide using reflectors of brass sheets. Diamond films are deposited using hot filament chemical vapor deposition (HFCVD). A novel concave structure of brass sheets is designed and fabricated, improving the distribution of temperature field, and overcoming the disadvantages of the conventional HFCVD systems. This increases the energy efficiency of use without changing the structure and increasing the cost of HFCVD. The grains are refined and the intensities of diamond peaks are strengthened obviously, which is confirmed by scanning electron microscopy and Raman spectra respectively.

Section: Discussionmentioning

confidence: 99%

A novel approach of deposition for uniform diamond films on circular saw blades

Yuan

Lyu

et al. 2017

Plasma Sci. Technol.

“…Autolysis is common for aquatic species and is widely believed to be caused by the endogenous proteolysis of its structural proteins (Ashie, Smith, Simpson, & Haard, 1996;Wasson, 1993).…”

Section: Morphological Changes Of S Japonicus Body Wallmentioning

confidence: 99%

In vivo mechanism of action of matrix metalloprotease (MMP) in the autolysis of sea cucumber (Stichopus japonicus)

Liu

Liu

et al. 2020

J Food Process Preserv

Matrix metalloprotease (MMP) is the key endogenous protease that boosts the autolysis of sea cucumber, while its action and mechanism in vivo are still unclear. MMP inhibitor (1,10‐phenanthroline) was injected into coelomic cavity of sea cucumber (Stichopus japonicus) and its effects on autolysis and mechanism of action were investigated for the first time by using scanning electron microscopy, multi‐functional in vivo imaging system, and confocal laser scanning microscopy. In response to external stimuli, the level of Ca2+ in live sea cucumber dermis increased, which may activate MMP activity. MMP inhibitor could diffuse from coelomic cavity into body wall and significantly prevented the activation of MMP by chelating Ca2+, and thus, retarded the autolysis of fresh sea cucumber by preventing degradation of interfibrillar proteoglycan bridges between adjacent collagen fibrils. This work provides information toward understanding the mechanism behind the sea cucumber autolysis and demonstrate a potential approach to prevent the autolysis. Practical applications Autolysis occurs in sea cucumber in response to external stimulation. Matrix metalloproteinase (MMP) has been found to be the key endogenous protease that boosts the autolysis of sea cucumber body wall (SCBW). However, the role of MMP in the autolysis of SCBW in vivo and the mechanisms involved remain unclear. In this study, MMP inhibitor (1,10‐phenanthroline) was injected into the body cavity of live sea cucumber, and its effects on in situ changes in SCBW were studied. Our results indicated that the activity of endogenous MMP in live SCBW was activated in response to external stimulation, which may be responsible for the autolysis. After injection into coelomic cavity, MMP inhibitor could diffuse into SCBW and significantly reduced the progress of typical morphological and microstructural changes of autolytic sea cucumber. Through chelating Ca2+, the MMP inhibitor could prevent the activation of MMP, and thus reduced the autolysis of fresh sea cucumber.

“…This method opens a new pathway to investigate the fundamental mechanisms of abrasive wear. Under the guidance of the method, novel diamond wheels and machining methods were developed 21 , 22 . Zhang et al 23 studied the corrosive wear behavior of the P110S casing steel in NaCl solutions with different pH values via the use of a self-made corrosive wear tester.…”

Section: Introductionmentioning

confidence: 99%

Design and development of a novel sliding friction and wear tester with complex working conditions

Chai

Cheng

et al. 2021

Sci Rep

Serious wear phenomena occur in mining machinery under complex working conditions, and the wear of machine parts is primarily caused by the synergistic effect of adhesive wear, abrasive wear, corrosive wear, etc. However, the existing friction and wear testing equipment cannot be used to carry out wear tests under complex working conditions. To simultaneously meet the test requirements of adhesive wear, abrasive wear, and corrosive wear, a novel sliding friction and wear tester that can simulate complex working conditions was developed in the present research. The tester is composed of a loading mechanism, a speed-regulating mechanism, a corrosion chamber, and a control and display system. Wear tests of the middle plate of a scraper conveyor, a key equipment of coal mining, were carried out to verify the consistency and effectiveness of the tester. The test results were consistent, and those under the same test conditions were similar with a maximum standard deviation of 2.4 mg. The wear condition of the middle plate specimens was close to the actual wear condition of the middle plate. Moreover, the surfaces of the middle plate specimens after grinding exhibited obvious adhesive, abrasive, and corrosive wear characteristics, and the wear degrees of the specimens under the same test conditions were similar. The quality loss of the middle plate specimens was found to increase with the increase of coal gangue percentage, and the main wear mechanism was the synergistic action of abrasive, adhesive, and corrosive wear.