Iron-based mixture powder for sintering and iron-based sintered alloy
a technology of mixture powder and iron-based alloy, which is applied in the direction of metal-working apparatus, transportation and packaging, etc., can solve the problems of inability to achieve sufficient machinability improvements in some cases, and the yield of s may drop, so as to reduce the cutting resistance of an iron-based sintered alloy and mitigate the shortening of the life of the cutting tool
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example 1
[0042]An iron-based mixture powder for sintering was produced by mixing an iron-based powder, a graphite powder, a hard powder that is harder than the iron-based powder, a metal fluoride powder, and a lubricant. Specifically, an iron-based powder (Fe)—1.1 mass % graphite powder (Gr)—30 mass % hard powder—1 mass % strontium fluoride powder (SrF2)—0.8 mass % lubricant (ZnSt) were prepared. The iron-based powder was a pure iron powder produced through a reductive method, and the iron-based particles forming the iron-based powder were a powder with an average particle size of 100 micrometers. The hard powder was produced through a gas atomization method, and the hard particles forming the hard powder comprised: 0.8 mass % C—1.1 mass % Si—5.1 mass % Mn—21 mass % Ni—6 mass % Cr—39 mass % Mo—22 mass % Co—4.5 mass % Fe—0.2 mass % Y. The hard powder was a powder with an average particle size of 100 micrometers.
[0043]Further, the strontium fluoride powder was produced by pulverizing, with a m...
example 2
[0052]A specimen made of an iron-based sintered alloy was produced in a similar fashion to Example1. Differences with respect to Example 1 lie in the fact that, by changing the pulverization conditions, there was produced a powder with a particle asperity of 2.75 (where N=10, average value of particle asperity: 2.75, minimum value: 2.18, and maximum value: 3.21).
[0053]
[0054]The specimen of Example 2 was cut out, and a section thereof was observed using an electron microscope. The result is shown in FIG. 3.
[0055]
[0056]The Sr- and F-contents (the amounts added) of the specimen of Example 2 were measured through X-ray atomic absorption spectroscopy. The results are presented in Table 1 below. It is noted that, of the values presented in Table 1, the theoretical values indicate the respective proportions (in mass %) of Sr and F relative to 1 mass % of the strontium fluoride powderthat has been added, and that the analytical values indicate the respective proportions (in mass %) of Sr an...
example 3
[0059]Specimens made of an iron-based sintered alloy were produced in a similar fashion to Example1. Differences with respect to Example 1 lie in the fact that, by changing the pulverization conditions, there were produced powders whose particle asperity of the strontium fluoride powder was 2.7, and in the fact that 0.5 mass % to 5.0 mass % of the strontium fluoride powder was added as shown in FIG. 4. The average particle size was 5 micrometers for all strontium fluoride powders.
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