Effects of annealing on the abrasive power of refractory carbides

1974 ◽  
Vol 13 (5) ◽  
pp. 416-419
Author(s):  
G. V. Samsonov ◽  
G. D. Nalivka
Keyword(s):  
Abrasive Power

Abrasive power of some nonmetallic refractory compounds

1968 ◽  
Vol 7 (3) ◽  
pp. 189-192
Author(s):  
G. V. Samsonov ◽  
V. V. Stasovskaya ◽  
V. K. Kazakov
Keyword(s):  
Refractory Compounds ◽  
Abrasive Power

Determination of Resistance to Abrasive Wear. VIII. Influence of Softeners in Tests with the Akron-Croydon and Du Pont Machines

1949 ◽  
Vol 22 (1) ◽  
pp. 259-262
Author(s):  
J. F. Morley
Keyword(s):  
Unit Area ◽  
Published Data ◽  
The Road ◽  
Abrasive Surface ◽  
Abrasive Power ◽  
The Difference ◽  
On The Road ◽  
The Right ◽  
Abrasion Testing

Abstract These experiments indicate that softeners can influence abrasion resistance, as measured by laboratory machines, in some manner other than by altering the stress-strain properties of the rubber. One possible explanation is that the softener acts as a lubricant to the abrasive surface. Since this surface, in laboratory abrasion-testing machines, is relatively small, and comes repeatedly into contact with the rubber under test, it seems possible that it may become coated with a thin layer of softener that reduces its abrasive power. It would be interesting in this connection to try an abrasive machine in which a long continuous strip of abrasive material was used, no part of it being used more than once, so as to eliminate or minimize this lubricating effect. The fact that the effect of the softener is more pronounced on the du Pont than on the Akron-Croydon machine lends support to the lubrication hypothesis, because on the former machine the rate of wear per unit area of abrasive is much greater. Thus in the present tests the volume of rubber abraded per hr. per sq. cm. of abrasive surface ranges from 0.03 to 0.11 cc. on the du Pont machine and from 0.0035 to 0.0045 cc. on the Akron-Croydon machine. On the other hand, if the softener acts as a lubricant, it would be expected to reduce considerably the friction between the abrasive and the rubber and hence the energy used in dragging the rubber over the abrasive surface. The energy figures given in the right-hand columns of Tables 1 and 3, however, show that there is relatively little variation between the different rubbers. As a test of the lubrication hypothesis, it would be of interest to vary the conditions of test so that approximately the same amount of rubber per unit area of abrasive is abraded in a given time on both machines; this should show whether the phenomena observed under the present test conditions are due solely to the difference in rate of wear or to an inherent difference in the type of wear on the two machines. This could most conveniently be done by considerably reducing the load on the du Pont machine. In the original work on this machine the load was standardized at 8 pounds, but no figures are quoted to show how abrasion loss varies with the load. As an addition to the present investigation, it is proposed to examine the effect of this variation with special reference to rubbers containing various amounts and types of softener. Published data on the influence of softeners on the road wear of tire rubbers do not indicate anything like such large effects as are shown by the du Pont machine. This throws some doubt on the value of this machine for testing tire tread rubbers, a conclusion which is confirmed by information obtained from other workers.

scholarly journals In vitro and in vivo evaluation of diamond-coated strips

2016 ◽  
Vol 87 (3) ◽  
pp. 455-459 ◽  
Author(s):  
Roberta Lione ◽  
Francesca Gazzani ◽  
Chiara Pavoni ◽  
Stefano Guarino ◽  
Vincenzo Tagliaferri ◽  
...  
Keyword(s):  
Contact Point ◽  
Sem Analysis ◽  
Tribological Test ◽  
In Vivo Evaluation ◽  
Wear Performance ◽  
Abrasive Grains ◽  
Abrasive Power ◽  
In Vivo Analysis

ABSTRACT Objective: To test in vitro and in vivo the wear performance of diamond-coated strips by means of tribological testing and scanning electronic microscope (SEM). Materials and Methods: To evaluate the in vitro wear performance, a tribological test was performed by a standard tribometer. The abrasive strips slid against stationary, freshly extracted premolars fixed in resin blocks, at a 2-newton load. At the end of the tribological test, the residual surface of the strip was observed by means of SEM analysis, which was performed every 50 meters until reaching 300 meters. For the in vivo analysis, the strip was used for 300 seconds, corresponding to 250 meters. Results: The strips presented a fenestrated structure characterized by diamond granules alternating with voids. After the first 50 meters, it was possible to observe tooth material deposited on the surface of the strips and a certain number of abrasive grains detached. The surface of the strip after 250 meters appeared smoother and therefore less effective in its abrasive power. After 300 seconds of in vivo utilization of the strip, it was possible to observe the detachment of diamond abrasive grains, the near absence of the grains and, therefore, loss of abrasive power. Conclusions: Under ideal conditions, after 5 minutes (300 meters) of use, the strip loses its abrasive capacity by about 60%. In vivo, a more rapid loss of abrasive power was observed due to the greater load applied by the clinician in forcing the strip into the contact point.

Abrasive power of refractory compounds

1966 ◽  
Vol 5 (9) ◽  
pp. 722-725 ◽  
Author(s):  
A. Ya. Artamonov ◽  
A. I. Bezykornov ◽  
A. N. Ivanov
Keyword(s):  
Refractory Compounds ◽  
Abrasive Power

Study on Mechanical Polishing for CVD Diamond Films of Forming Nucleus Surface and Growing Surface

2007 ◽  
Vol 359-360 ◽  
pp. 285-289 ◽  
Author(s):  
Rong Fa Chen ◽  
Dun Wen Zuo ◽  
Wen Zhuang Lu ◽  
Duo Sheng Li ◽  
Feng Xu ◽  
...  
Keyword(s):  
Removal Rate ◽  
Diamond Films ◽  
Surface States ◽  
Chemical Vapor ◽  
Commercial Application ◽  
Polished Surface ◽  
Fine Crystal ◽  
Before And After ◽  
Nucleus Surface ◽  
Abrasive Power

In the present work, high power DC arc plasma jet chemical vapor deposition (CVD) is used to prepare diamond films with full width half magnitude (FWHM) less than 10 wave numbers at 1332 cm−1 Raman peak. During the polishing process, diamond film is hold against the stainless steel holder, which rotates and swings when the sample comes into contact with the cast-iron plate. Average surface roughness of the forming nucleus polished surface and growing polished surface is 560nm, 90nm respectively. And the materials removal rate is quite different. Fine crystal grain of the forming nucleus surface and the thick column crystal of growing surface are dominant in structure. In the meantime, effects of the size of the abrasive power, the applied force and polishing direction are also discussed. A profilometer, an Raman spectroscopy, X-ray diffraction and a scanning electron microscope have been used to evaluate the surface states of diamond films before and after polishing. This result reveals an. improvement of polishing efficiency and a great potential for commercial application.

Shape, strength, and abrasive power of grains of refractory compound powders

1971 ◽  
Vol 10 (5) ◽  
pp. 397-400
Author(s):  
A. I. Bezykornov ◽  
N. I. Bogomolov ◽  
I. I. Gurinchuk ◽  
M. S. Koval'chenko ◽  
E. S. Konovalova ◽  
...  
Keyword(s):  
Refractory Compound ◽  
Abrasive Power

Abrasive power of titanium carbide and carbonitride

1981 ◽  
Vol 20 (6) ◽  
pp. 426-428 ◽  
Author(s):  
M. P. Arbuzov ◽  
E. I. Moshkovskii ◽  
A. B. Lyashchenko
Keyword(s):  
Titanium Carbide ◽  
Abrasive Power

Improving the abrasive power of corundum and carborundum powders by vacuum-heat treatment

1966 ◽  
Vol 8 (1) ◽  
pp. 127-128
Author(s):  
M. A. Ilyushchenkov ◽  
K. V. Savitskii ◽  
V. N. Kashcheev
Keyword(s):  
Heat Treatment ◽  
Vacuum Heat Treatment ◽  
Abrasive Power

Abrasive power and grain strength of rhombohedral?-boron

1973 ◽  
Vol 12 (8) ◽  
pp. 650-653
Author(s):  
G. V. Samsonov ◽  
A. A. Adamovskii ◽  
A. I. Bezykornov ◽  
V. V. Uvarov ◽  
N. Ya. Nemtsova ◽  
...  
Keyword(s):  
Abrasive Power ◽  
Rhombohedral Boron
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