Wear-resistant low-temperature-resistant hydraulic material and preparation method thereof
A low temperature resistant and hydraulic technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems affecting the normal use and service life of water hydraulic motors, poor lubricating performance of lubricating medium, easy corrosion, wear and other problems, so as to improve the quality of products The effect of improving the efficiency and raw material utilization, reducing the material friction coefficient, enhancing low temperature resistance and low temperature durability
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[0026] A method for preparing a wear-resistant and low-temperature resistant hydraulic material, comprising:
[0027] In the presence of indium oxide and tricobalt tetroxide, press the semi-finished raw material containing paraffin and infiltrant through cold pressing and hot pressing; the particle size of the semi-finished raw material is less than 200 mesh; then,
[0028] In a protective atmosphere environment, after the dewaxing pre-sintering and sintering treatment are completed with increasing the temperature of the above-mentioned molding product, the above-mentioned hydraulic material is obtained by finishing; the above-mentioned protective atmosphere is a decomposed ammonia / nitrogen-based atmosphere; the above-mentioned decomposed ammonia / nitrogen-based atmosphere The volume ratio of decomposed ammonia to nitrogen is 2-5:1.5. The above preparation method changes the internal particle size and phase reconstruction of the material through the combination of pre-sintering...
Embodiment 1
[0044] A method for preparing a wear-resistant and low-temperature resistant hydraulic material comprises the following specific steps:
[0045] 1. Melting: The raw materials are selected by weight percentage: graphite 1.5%, Mn 0.7%, Si 1.3%, S≤0.02%, Cr 16.5%, Ti 3.5%, B 1.0%, and the balance is Fe, mixed and sent into Melting in a furnace at 1500°C for 30 minutes to obtain an intermediate product;
[0046] 2. Atomization: use high-pressure water with a pressure of 80MPa and a flow rate of 350L / min to atomize the intermediate product into powder, and sieve to obtain powdery semi-finished raw materials with a particle size of less than 200 mesh;
[0047] 3. Preparation of infiltrants: According to the following parts by weight: 13 parts of copper, 4.5 parts of barium, 2.5 parts of strontium, 68 parts of iron, and 1.5 parts of rare earth oxides. Select raw materials, mix them, and heat to 1550 ° C in an argon atmosphere to melt the iron powder. Stir evenly, pulverize, and pass...
Embodiment 2
[0053] The difference between the preparation method of the wear-resistant and low-temperature resistant hydraulic material and that of Example 1 is that:
[0054] In step 1: the weight percentage of raw materials is: graphite 1.8%, Mn 1.2%, Si 2.4%, S≤0.02%, Cr17.8%, Ti 5.2%, B 1.3%, and the balance is Fe;
[0055] In step 3: the composition and parts by weight of the infiltrant raw materials are: 16.5 parts of copper, 2.8 parts of barium, 3.3 parts of strontium, 73 parts of iron, and 4.6 parts of rare earth oxides. Lanthanum and cerium oxide;
[0056] In step 4: the additions of paraffin and infiltrant are respectively 4.3% and 11.7% of the weight of powdered semi-finished raw materials, and the additions of indium oxide and tricobalt tetroxide are respectively 0.065% and 0.085% of the weight of paraffin;
[0057] In step 5: heat up to 800°C, dewax the molded product for 1 hour, then raise the temperature to 1100°C in a protective atmosphere at a rate of 10°C / min, sinter fo...
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