A kind of preparation method of high strength, high thermal conductivity iron-based metallurgy
The traditional cylinder head materials can no longer meet the requirements of use. With the demand for lightweight equipment and the further improvement of the power density of diesel engines, the development of new lightweight, high-strength, and high thermal conductivity iron-based metallurgical materials has become a top priority. Surface-treated synthetic diamond powder can be added to iron-based metallurgy as a reinforcing phase, which can greatly improve the thermal conductivity of the material while reducing the overall density of the material. However, it was found that the addition did not significantly improve the overall mechanical properties of the material, and the mechanical properties of the material could not meet the application requirements.
Technical points: Technicians provide an iron-based metallurgy with high strength and high thermal conductivity and its preparation method to overcome the problem that the mechanical properties of materials in the existing technology are difficult to meet the requirements of use. A preparation method for iron-based metallurgy with high strength and high thermal conductivity, comprising the following steps: 1. Mix raw material powder nickel powder and aluminum powder with an atomic ratio of 1.333.601, and put them into a ball mill tank filled with argon gas and evacuated Ball milling, the total time is 70 hours, the running/stop interval is 30 minutes, and the fine and uniform b2 structure nano nial powder is obtained; 2. The prepared 42.50-48.50 parts of iron powder and 42.50-48.50 parts of nial powder are prepared according to the mass ratio of 1.333.601. After the ratio, continue ball milling and mix 5 hours and add 3.00-15.00 parts of aln powder to obtain alloy powder, wherein the total amount of iron powder, nial powder and aln powder is 100 parts; Three, the alloy powder obtained in step 2 is loaded into the graphite mold , sintered by hot pressing to form the desired bulk composite material, the sintering pressure is 20mpa, and the sintering temperature is 1050°. The step-by-step ball milling method is adopted, the mass ratio of the material to the ball is 13.336.010, the rotating speed is 250 rpm, and the particle size of the powder is 100 nanometers to 200 nanometers. Using the step-by-step ball milling method, the mass ratio of material to grinding ball is 1:3, and the rotation speed is 100 rpm. The iron-based alloy with high strength and high thermal conductivity prepared by the above-mentioned preparation method of iron-based metallurgy.
Compared with the prior art, the advantages of the above-mentioned iron-based metallurgy and its preparation method are:
1. The iron-based metallurgical preparation method is simple. According to the amount of aln powder added in the mechanical alloying process, the mass fraction of aln in the aln/nial reinforced iron-based alloy is adjusted, thereby reducing the density of the material and improving the mechanical properties and high temperature thermophysical properties of the material. performance;
2. The iron-based metallurgy and its preparation method combine mechanical alloying technology with hot-pressing sintering technology, and the developed new aln/nial reinforced iron-based alloy can be used in technical fields such as high power density diesel engine cylinder head materials.
3. The theoretical density of aluminum nitride is 3.26 g/cm3, and its crystal structure is similar to that of diamond. It has high hardness and strength at room temperature and high temperature, good corrosion resistance at high temperature, low cost, good wettability with iron base and b2 structure nial, no adverse interfacial reaction, physical and chemical compatibility it is good.
4. The iron-based metallurgy and its preparation method The preparation process adopts a graded ball milling process, and the obtained product has low cost, high purity, low density, and excellent mechanical properties and thermophysical properties.
