Iron base sintered alloy exhibiting high surface densification and high surface hardness, and method for production thereof
An iron-based sintering, surface hardness technology, applied in chemical instruments and methods, metal processing equipment, metal layered products, etc., can solve the problems of incomplete formation, insufficient tightness of the inner surface of the cavity, and difficulty in forming a lubricant film.
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Embodiment approach 1
[0108] A cavity having a diameter of 11 mm and a height of 40 mm was prepared, and a forming mold capable of heating the inner surface of the cavity to a predetermined temperature was prepared. Furthermore, as raw material powders, Fe-1.5% Mo iron-based alloy powder with an average particle size of 90 μm and C powder with an average particle size of 20 μm were prepared, and were prepared and mixed with a V-type mixer to form Fe-1.5% Mo-0.3% C, Instead, a mixed powder was produced.
[0109] Furthermore, potassium sulfate, potassium sulfite, potassium thiosulfate, potassium dodecylsulfate, potassium dodecylbenzenesulfate, edible cyanine No. 1, and potassium ascorbyl sulfate were prepared as potassium sulfate salts. Sodium sulfate salt, sodium sulfate, sodium sulfite, sodium thiosulfate, sodium lauryl sulfate, sodium dodecylbenzene sulfate, edible yellow pigment No. 5, and sodium ascorbyl sulfate were prepared.
[0110] Lubricants A to U and a to f shown in Table 1-1 were produced...
Embodiment 1-1
[0113] After keeping the temperature of the inner surface of the cavity of the forming mold at 150°C in advance, apply the lubricants A~G and a~b shown in Table 1-1 to the inner surface of the cavity with different thicknesses, and evaporate the water, On the inner surface of the cavity, a layer of different thicknesses composed of potassium sulfate, potassium sulfite, potassium thiosulfate, potassium dodecylsulfate, potassium dodecylbenzenesulfate, edible cyanine No. 1 and potassium ascorbyl sulfate is formed. crystalline layer.
[0114] On the other hand, in the cavity of the forming mold forming these crystalline layers, the raw material powder Fe-1.5% Mo iron-based alloy powder and C powder are filled, mixed with a V-shaped mixer, and prepared as Fe-1.5% Mo -0.3% C, and after obtaining the mixed powder, it was press-molded at 800 MPa to produce a green compact having a high-concentration layer of K on the surface. The thus-obtained compacted powder having a high-concentra...
Embodiment 1-2
[0122] After keeping the temperature of the inner surface of the cavity of the forming mold at 150°C in advance, apply the lubricants H~N and c~d shown in Table 1-1 to the inner surface of the cavity with different thicknesses, and evaporate the water, Crystalline layers with different thicknesses are formed on the inner surface of the cavity and are composed of disodium bisulfate, trisodium sulfate, polysodium sulfate and riboflavin sodium sulfate.
[0123] On the other hand, in the cavity of the molding mold forming these crystal layers, the raw material powder Fe-1.5%Mo iron-based alloy powder and C powder are filled, mixed by a V-shaped mixer, and prepared as Fe-1.5%Mo -0.3% C, and the obtained mixed powder was press-molded at 800 MPa to produce a green compact having a high-concentration layer of Na on the surface. The thus-obtained pressed powder body having a high-concentration layer of Na on the surface was heated in 5% H 2 -N 2 In a gas atmosphere, sintering was car...
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