Silicon carbide/wolfram carbide composite material and preparation method thereof
A technology of tungsten carbide composite materials and silicon carbide, which is applied in the field of wear-resistant materials, can solve the problems of difficult control of the mixing uniformity of WC components, difficult dispersion of SiC whiskers, and high production costs, so as to broaden the scope of application and enhance wear resistance The effect of improving compatibility
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Embodiment 1
[0038] Example 1 A preparation method of silicon carbide / tungsten carbide composite material:
[0039] Weigh 3.00 g (0.075 mol) of silicon carbide with a particle size of less than 1 μm, soak the silicon carbide in 14 mol / L concentrated nitric acid, acidify for 3 h, and wash the nitric acid with distilled water. Then weigh 16.20 g of ammonium metatungstate, dissolve it in 200 ml of distilled water, and prepare a solution containing W element concentration of 0.3 mol / L. The acid-treated SiC particles were added to the ammonium metatungstate solution and dispersed ultrasonically for 30 min. At room temperature, use a separatory funnel to slowly add 100 ml of nitric acid solution with a concentration of 1 mol / L to the ammonium metatungstate solution containing SiC dropwise, stir for 10 h, and then react in a water bath at 80°C until the water evaporates to dryness. The obtained powder was vacuum-dried at 100 °C for 10 h to obtain 16.52 g of precursor; 5.03 g of precursor was cal...
Embodiment 2
[0040] Example 2 A preparation method of silicon carbide / tungsten carbide composite material:
[0041] Weigh 0.28 g (0.007 mol) of silicon carbide with a particle size of less than 1 μm, 3.77 g of ammonium metatungstate (containing 0.014 mol ), concentrated nitric acid 2 ml (14 mol / L), distilled water 63 ml, ultrasonic dispersion for 60 min (45 HZ, 300 W, power 60%). Then reacted in a water bath at 50°C until the water was evaporated to dryness to obtain 4.11 g of the precursor, and 3.02 g was calcined at 500°C for 1 h to obtain 2.73 g of WO 3 / SiC composite powder, see the XRD pattern Figure 10 , it can be seen that the main crystal phase of the product is WO 3 (JCPDS card No. 20-1323) and SiC (JCPDS card No. 29-1131), scanned photos as Figure 11 As shown, the product is an aggregate with a particle size of about 10-20 μm, Figure 12 It is the energy spectrogram of the sample. It can be seen from the figure that the main elements in the product are W, Si, C, O, and a sm...
Embodiment 3
[0042] Example 3 A preparation method of silicon carbide / tungsten carbide composite material:
[0043] Weigh 1.12 g (0.028 mol) of silicon carbide with a particle size of less than 1 μm, 3.77 g of ammonium metatungstate (containing 0.014 mol of W ), concentrated nitric acid 2ml (14mol / L), distilled water 63ml, ultrasonic dispersion for 60 min (45HZ, 300W, 60%). Then reacted in a water bath at 80°C until the water was evaporated to dryness to obtain 4.79 g of the precursor, and 3.51 g was calcined at 500°C for 1 h to obtain 3.26 g of WO 3 / SiC composite powder, take 2.49 g WO 3 / SiC composite powder was placed in an alumina crucible, placed in a quartz tube atmosphere furnace, and CO was first passed through at a flow rate of 80 ml / min. 2 Wash the furnace with gas for 1 h, then pass CO 2 Mixed gas with CO (CO 2 :CO=1:10, volume ratio) and start to heat up, heated to 850°C at a rate of 10°C / min and kept for 5 h, then cooled naturally to room temperature to obtain 2.13 g of W...
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