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Download - Hochschule München

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Intensity (a.u.)

Intensity (a.u.) Intensity (a.u.) 200 150 100 50 0 30° 40° 50° 60° 70° 80° 90° - 30 - WS84 7% a-C:W Scattering angle 1450 K 1800 K 2200 K 2500 K Figure 4.2: XRD diffractograms of the annealing serie of the 7% a-C:W samples. 1500 1000 500 PDF WC WC 1-x W 2 C C 80 60 40 20 T2T 0 0 30° 40° 50° 60° 70° 80° 90° Scattering angle WS83 9% a-C:W 1450K 1800K 2200K 2500K 2800K Figure 4.3: XRD diffractograms of the annealing serie of the 9% a-C:W samples. PDF WC WC 1-x W 2 C C T2T 0 100 100 80 60 40 20

The XRD diffractogram of a 10% a-C:W looks different to that of the 6%, 7% and 9% a- C:W, figure 4.4. For temperature up to 1800K, a large broad peak can be found around 35°- 40°, meaning small crystallites are there. Hence all three carbide have diffraction peaks in this range, therefore no assumption about individual crystal carbides can be made. The broad peak shows two shoulders, one on each side. The shoulder on the left side is found around 35°, an indication for W2C, where the shoulder on the right side can be found near 39°, another indication for W2C. Although all anomalies indicate the presents of W2C, small amounts of WC and WC1-x might be present. Annealing to 2200K clearly leads to the formation of W2C peaks at 34°, 38° and 39°. A small shoulder of the 39° peak can be noticed, indicating the presence of WC1-x. In the 2500K specimen large peaks appear which were not present in the lower annealed samples belonging to WC, while the WC1-x strongly increase in intensity. A close observation shows that the intensity of the W2C peaks has declined, meaning that the W2C is slowly disappearing. Crystal measurement for the 2500K sample show that the WC1-x crystals are 10 nm big, WC crystals 27 nm, and W2C are smaller than 5 nm. Unfortunately no 2800K sample is available, hence no conclusion can be drawn whether W2C has completely disappeared or is still present. Intensity (a.u.) 300 200 100 WS86 10% a-C:W 1450K 1800K 2200K 2500K 0 T2T 0 30° 40° 50° 60° 70° 80° 90° Scattering angle Figure 4.4: XRD diffractograms of the annealing serie of the 10% a-C:W samples. - 31 - PDF WC WC 1-x W 2 C C 100 80 60 40 20

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