Preparation method of iron-based metallurgy with high strength and high thermal conductivity


The traditional cylinder head material can no longer meet the requirements of use, with the demand for lightweight equipment and the further improvement of diesel engine power density, the development of new lightweight, high strength, high thermal conductivity.iron-based metallurgyMaterials become a priority. The 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: Technical personnel to provide a high-strength, high thermal conductivity of iron-based metallurgy and its preparation method, in order to overcome the existing technology in the material mechanical properties difficult to meet the requirements of the use of the problem. A preparation method of high-strength, high-thermal conductivity iron-based metallurgy, including the following steps: 1. mixing raw material powder nickel powder and aluminum powder at an atomic ratio of 1.333.601, and putting them into an argon-filled, vacuum-pumped ball milling tank, The total time is 70 hours, the operation/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 mixed according to the mass ratio of 1.333.601, and then ball mill mixing is continued for 5 hours to add 3.00-15.00 parts of aln powder to obtain alloy powder, of which the total amount of iron powder, nial powder and aln powder is 100 parts; 3., the alloy powder obtained in step 2 is put into a graphite mold and sintered by hot pressing to form the required bulk composite material, the sintering temperature was 1050 °. Using the step-by-step ball milling method, the mass ratio of the feed ball is 13.336.010, the speed is 250 r/min minutes, and the particle size of the powder is 100 nm -200 nm. Using step by step ball milling method, the mass ratio of material and grinding ball is 1:3, and the rotating speed is 100 r/min minutes. A high-strength, high-thermal-conductivity iron-based alloy prepared by the above-mentioned method for preparing iron-based metallurgy.

       铁基冶金

Compared with the existing technology, the advantages of the above-mentioned iron-based metallurgy and its preparation method are:


1, iron-based metallurgical preparation method is simple, according to the amount of aln powder added in the process of mechanical alloying to adjust the mass fraction of aln in the aln/nial enhanced iron-based alloy, thereby reducing the density of the material, improving the mechanical properties of the material and high temperature thermal physical properties;


2. The iron-based metallurgy and its preparation method combine mechanical alloying technology with hot-pressing sintering technology, and the new aln/nial reinforced iron-based alloy developed can be used in high power density diesel engine cylinder head materials and other technical fields.


The theoretical density of aluminum nitride is 3.26g/cm3, and the crystal structure is similar to diamond. It has high hardness and strength at room temperature and high temperature, good corrosion resistance at high temperature, low cost, good wettability with nial of iron base and b2 structure, no bad interface reaction, good physical and chemical compatibility.


4,iron-based metallurgyAnd its preparation method preparation process using graded ball grinding process, the resulting product cost is low, high purity, low density, excellent mechanical properties and thermal physical properties.


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Preparation method of iron-based metallurgy with high strength and high thermal conductivity

The preparation method of iron-based metallurgy is simple, and the mass fraction of aln in the iron-based alloy is adjusted according to the amount of aln powder added in the mechanical alloying process, so as to reduce the density of the material, improve the mechanical properties and high temperature physical properties of the material.

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