A Cr-C-N ternary hard material and a preparing method thereof

[0030] The present invention provides the preparation method of Cr-C-N ternary hard material described in above scheme, comprises the following steps:

[0031] (1) chromium oxide and carbon source are mixed by ball milling and then dried to obtain a mixture;

[0032] (2) heat-treating the mixture under flowing nitrogen to obtain Cr-C-N ternary single-phase powder;

[0033] (3) Sintering the Cr-C-N ternary single-phase powder to obtain the Cr-C-N ternary hard material.

[0034] In the invention, the chromium oxide and the carbon source are mixed by ball milling and then dried to obtain the mixture. In the present invention, the carbon source is preferably one or more of carbon powder, graphite and carbon black, and the carbon black is preferably nano-carbon black; the present invention is to the source of the carbon powder, graphite and carbon black There is no special requirement, and a commercially available corresponding product can be used. In the present invention, when...

[0049] Weigh 80 grams of chromium oxide and 20 grams of carbon black and put them into a ball mill jar, ball mill and mix for 20 hours. The mixing medium is absolute ethanol. Take out the mixture and put it in an oven for drying. The temperature was raised to 1200°C for 1 hour, and the nitrogen flow rate was 2L / min. After cooling in the furnace, the Cr-C-N single-phase powder was obtained, which was taken out, crushed, sieved, and packaged. Then, weigh 20 grams of Cr-C-N ternary single-phase powder, put it into a mold, put it into a hot-press sintering furnace, and raise the temperature to 1200°C at a speed of 10°C / min under a pressure of 30MPa, and press-hold and sinter After 30 minutes, cool with the furnace to produce a Cr-C-N ternary hard material with a C content of 0.1% and an N content of 11%. The C content is measured by a carbon-sulfur analyzer, and the N content is measured by an oxygen-nitrogen analyzer. .

[0051] Weigh 87 grams of ammonium dichromate and 13 g of glucose, dissolve them in deionized water, stir until they are evenly mixed, concentrate and dry at 65°C for 4 hours to obtain a mixed precursor powder, then calcinate at 300°C for 2 hours under the protection of argon, and transfer to In the heat treatment furnace, the temperature was raised to 1100°C for 1 hour under flowing nitrogen, and the nitrogen flow rate was 1.5L / min. After cooling with the furnace, the Cr-C-N single-phase powder was obtained, taken out, crushed, sieved, and packaged. Then weigh 30 grams of Cr-C-N ternary single-phase powder, put it into a mold, put it into an SPS sintering furnace, and heat it up to 1300°C at a speed of 50°C / min under a pressure of 100MPa, and sinter under pressure for 10 minutes After cooling in the furnace, a Cr-C-N ternary hard material with a C content of 1.5% and a N content of 10% is prepared.