Diamond Crystal Software BEST Crack 4
figure 14 depicts the formation of a diamond film on the spun cemented carbide substrate. the sem micrograph shows several tiny grains of the diamond film. the coating layer consists of nanocrystalline diamond grains ( dg) and small grains of amorphous carbon (ca). the average dg size is 1.5 μm. there are also several carbon (ca) particles with the size of about 0.1-1.0 μm, which are assumed to have resulted from the decomposition of the ca used in the coating process.
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microhardness indentation test results are shown in fig. 15. the average hardness of the uncoated surface is (1214) hv, which was obtained by the analysis of the center region of the microhardness test. the average hardness of the carbonated surface is (5285) hv. the diamond film formed on the corrugated surface is significantly harder than the uncoated surface. the diamond coating also provides a protective layer, and there is no interference with the substrate, as evidenced by the same hardness values. for the diamond coated on the non-corrugated surface, the hardness is (4352) hv. this is higher than that of the uncoated surface.
the sem images of the t5t6 samples (fig. 15 ) show that both samples had a thin, compact, and dense coating (fig. 15 a and b). however, the coating on sample t6 had better adhesion to the substrate because of its thicker film (fig. 15 c and d). the raman spectra of the t6 sample (fig. 15 e) indicated a strong diamond character with one strong g-band and a weak d-band. the x-ray diffraction data (fig. 15 f) showed that the film had a high crystallinity. the raman spectra of the t5 sample (fig. 15 g) also showed the presence of a diamond-like structure with the d-band at 1365.17cm1 and the g-band at 1601.8cm1. the g-band could be attributed to the presence of a-c: h content. the xrd data (fig. 15 h) indicated the absence of a taxc intermediate phase, and the higher raman intensity of the d-band in the t5 sample revealed the presence of a-c: h content and more c=c bonds with its polymeric structure. the higher ra of the t5 sample indicates that the coating had better resistance to surface damage. the mcd growth of sample t5 had the highest nucleation rate and the minimum growth time. however, the surface morphology, hardness, and adhesion of sample t6 (fig. 15 i) were comparable to the t5 sample.