Metal ceramic and preparation method thereof
A technology of cermets and ceramic powders, applied in the field of cermets and its preparation, can solve problems such as dull color, low density, and many cavities in fired embryos, and achieve the effect of improving density
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[0025] The present invention further proposes a method for preparing cermets, see figure 1 As shown, the following steps are carried out after obtaining the raw materials according to the material ratio of the above-mentioned cermet:
[0026] S10, modifying the Ni powder with P powder to form a coating structure of P on metal Ni;
[0027] S20, for TiN powder and TiO 2 The powder is modified to make TiO 2 Some of the oxygen atoms enter the TiN lattice, thus generating Ti x N y compound;
[0028] S30, performing ball milling on the modified TiN, Ni powder and Mo, Nb, Cr, and C raw material powders, and drying to obtain ceramic powders;
[0029] S40, adding the dried ceramic powder to a binder and then kneading, so that the ceramic powder and the binder are evenly mixed to form an injection feed;
[0030] S50, performing injection molding on the injection feed to generate green embryos;
[0031] S60, solvent degreasing the formed green body;
[0032] S70, debinding the de...
Embodiment 1
[0050] S10, weigh 740g of Ni powder (purity 99.5%, average particle size 4μm), P powder (purity 99.9%, average particle size 0.8μm) 40g, put them in a stainless steel vacuum ball mill tank, add WC hard alloy ball. Then vacuumize the jar and put it into a high-energy ball mill for 30 hours of ball milling, then take out the powder and sieve to complete the modification of P powder to Ni powder.
[0051] S20, weigh 2500g of TiN powder (purity 99.5%, average particle size 5μm), TiO 2 30 g of powder (purity 99.9%, average particle size 1 μm) was placed in a ball mill jar, after adding appropriate amount of alcohol and balls, ball milled for 25 hours. Then take out the slurry, dry and sieve it, put it into a ceramic sagger, put it into a vacuum furnace, raise the temperature to 1000°C at a rate of 5°C / min, and keep it warm for 2 hours. During the heating process, a nitrogen flow rate of 20L / h is guaranteed. ; After the process is completed, the modified TiN powder is pulverized a...
Embodiment 2
[0062] S10, weigh 900g of Ni powder (purity 99.5%, average particle size 4μm), P powder (purity 99.9%, average particle size 0.8μm) 65g, put them in a stainless steel vacuum ball mill tank, add WC hard alloy ball. Then vacuumize the jar and put it into a high-energy ball mill for 28 hours of ball milling, then take out the powder and sieve to complete the modification of the Ni powder.
[0063] S20, weigh 2200g of TiN powder (purity 99.5%, average particle size 5μm), TiO 2 20 g of powder (purity 99.9%, average particle size 1 μm) is placed in a ball mill jar, after adding appropriate amount of alcohol and balls, ball milled for 20 hours. Then take out the slurry, dry, sieve, put it into a ceramic sagger, put it into a vacuum furnace, raise the temperature to 1100°C at a rate of 10°C / min, and keep it warm for 2 hours. During the heating process, a nitrogen flow rate of 10L / h is guaranteed. . The modified TiN powder is pulverized and sieved for later use.
[0064] S30, weigh...
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