Mixed powder for powder metallurgy
Abstract
Provided is a mixed powder for powder metallurgy that uses a fatty acid amide, which is a clean lubricant, and achieves excellent green compact ejectability and compressibility not only at room temperature but also after the die temperature has increased. A mixed powder for powder metallurgy comprises: an iron-based powder; and a fatty acid amide as a lubricant, wherein the fatty acid amide includes a saturated fatty acid bisamide, a saturated fatty acid monoamide, and an unsaturated fatty acid amide, the unsaturated fatty acid amide includes one or both of an unsaturated fatty acid bisamide and an unsaturated fatty acid monoamide, and the predetermined Formulas are satisfied.
Claims
exact text as granted — not AI-modified1 . A mixed powder for powder metallurgy, comprising:
an iron-based powder; and a fatty acid amide as a lubricant, wherein the fatty acid amide includes a saturated fatty acid bisamide, a saturated fatty acid monoamide, and an unsaturated fatty acid amide, the unsaturated fatty acid amide includes one or both of an unsaturated fatty acid bisamide and an unsaturated fatty acid monoamide, and the following Formulas (1) to (3) are satisfied:
0
<
(
b
1
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+
(
b
2
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+
(
b
3
)
+
(
b
4
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≤
2
.
0
Formula
(
1
)
0
<
(
b
1
)
/
(
b
2
)
<
0.45
Formula
(
2
)
0
<
[
(
b
3
)
+
(
b
4
)
]
/
[
(
b
1
)
+
(
b
2
)
+
(
b
3
)
+
(
b
4
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≤
0
.
3
5
Formula
(
3
)
where b1, b2, b3, and b4 respectively denote addition amounts of the saturated fatty acid bisamide, the saturated fatty acid monoamide, the unsaturated fatty acid bisamide, and the unsaturated fatty acid monoamide in parts by mass relative to 100 parts by mass of the iron-based powder.
2 . The mixed powder for powder metallurgy according to claim 1 , wherein the fatty acid amide has a long-chain alkyl group or alkenyl group having a carbon number of 11 or more and 21 or less.
3 . The mixed powder for powder metallurgy according to claim 1 , wherein the fatty acid amide is a derivative of lauric acid, palmitic acid, stearic acid, behenic acid, oleic acid, or erucic acid.
4 . The mixed powder for powder metallurgy according to claim 1 , further comprising at least one of carbon black, metal oxide fine particles, and metal soap as a fluidity improver.
5 . The mixed powder for powder metallurgy according to claim 1 , further comprising one or both of an alloying powder and a machinability improver.
6 . The mixed powder for powder metallurgy according to claim 5 , wherein one or both of the alloying powder and the machinability improver adhere to a particle surface of the iron-based powder via the fatty acid amide.Join the waitlist — get patent alerts
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