Sintered composite sliding part and production method therefor
a composite sliding part and composite material technology, applied in the field of sintered composite sliding parts, can solve the problems of low toughness, insufficient strength of component parts, and inability to suitably use sintered materials in welding, so as to improve wear resistance and corrosion resistance, reduce raw powder compressibility, and increase the density of outer parts
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First Example
[0029]Inner members were prepared, and the inner members were made of an ingot steel corresponding to SUS304 specified by the Japanese Industrial Standard (JIS) and had an outer diameter of 20 mm and a height of 10 mm. Fe-based alloy powders and a hard phase forming alloy powder having compositions shown in Table 1 were prepared, and they were mixed together at the mixing ratio shown in Table 1 so as to obtain raw powders. The average particle diameter of the Fe-based alloy powders was 100 μm, and the average particle diameter of the hard phase forming alloy powders was 100 μm. The raw powders were compacted under a forming pressure of 800 MPa so as to have a ring shape with an outer diameter of 30 mm, an inner diameter of 20 mm, and a height of 5 mm, and 15 ring-shaped compacts were prepared with respect to each combination of the Fe-based alloy powder and the hard phase forming alloy powder. Batches of 10 of the ring-shaped compacts were used as outer member compacts,...
second example
[0038]Fe-based alloy powders having compositions shown in Table 2 and the hard phase forming alloy powder used in the first example were prepared, and they were mixed together at the mixing ratio shown in Table 2 so as to obtain raw powders. By using these raw powders, compacting, closely fitting, and sintering were performed in the same manner as in the first example, and samples having sample Nos. 08 to 14 were obtained. Powders having an average particle diameter of 100 μm, which was the same as the average particle diameter of powders used in the first example, were used as the Fe-based alloy powders.
[0039]For these samples, oxidation tests, repeated sliding friction tests, and extracting tests were performed under the same conditions as those in the first example, and the oxidized amounts after the oxidation tests, wear amounts after the friction tests, and bonding strengths were measured. These results are shown in Table 2, and the results of the sample of the sample No. 04 in...
third example
[0042]The Fe-based alloy powder used in the sample No. 04 in the first example and hard phase forming alloy powders were prepared, and they were mixed together at the mixing ratio shown in Table 3 so as to obtain raw powders. By using these raw powders, compacting, closely fitting, and sintering were performed in the same manner as in the first example, and samples having sample Nos. 15 to 21 were obtained.
[0043]For these samples, oxidation tests, repeated sliding friction tests, and extracting tests were performed under the same conditions as those in the first example, and the oxidized amounts after the oxidation test, wear amounts after the friction test, and bonding strengths were measured. These results are shown in Table 3, and the results of the sample of the sample No. 04 in the first example are also shown in Table 3.
TABLE 3Outer membermixing ratio % by volumeTest resultsHard phaseOxidizedWearBondingSampleFe-basedCompositions % by massformingInneramountamountstrengthNo.allo...
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