JP5878092B2 - 金属粉末冶金用潤滑剤組成物および該組成物の製造方法 - Google Patents
金属粉末冶金用潤滑剤組成物および該組成物の製造方法 Download PDFInfo
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- JP5878092B2 JP5878092B2 JP2012169927A JP2012169927A JP5878092B2 JP 5878092 B2 JP5878092 B2 JP 5878092B2 JP 2012169927 A JP2012169927 A JP 2012169927A JP 2012169927 A JP2012169927 A JP 2012169927A JP 5878092 B2 JP5878092 B2 JP 5878092B2
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- 125000002889 tridecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 125000005065 undecenyl group Chemical group C(=CCCCCCCCCC)* 0.000 description 1
- 125000002948 undecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
- 239000010698 whale oil Substances 0.000 description 1
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- Powder Metallurgy (AREA)
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Description
R5〜R7の3つの基のうち、1つが一般式(4)で表される基で残りの2つが水素原子の場合、一般式(3)はモノグリセリドになる。モノグリセリドとしては、例えば、上記に挙げたいずれかの油脂のアシル基2つを水素原子に変えたものが挙げられる。
実施例1〜12及び比較例1〜13の各サンプルを160℃で溶融混合後、50℃の雰囲気に調整した空冷槽内にスプレー噴霧機を用いて圧縮空気圧0.25MPaで噴霧した。噴霧終了後、空冷槽の保温のための加熱をやめ、放置して室温まで冷却した。冷却後、166メッシュ(目開き90μm)の分級網を用いて大きな粒子を除去したあとに得られた粒子を試験に用いた。なお、実施例13は、空冷槽内の雰囲気を28℃に調整して噴霧後の粒子を急速冷却させた以外は、上記と同じ方法で試験用の潤滑剤を作成した。
酸化されていないアトマイズ純鉄粉486g、電解銅粉10g、グラファイト粉末4gの合計500gをガラス製V型混合機に投入し、下記の表1に示した潤滑剤を上記混合粉末金属粉末に対して0.8%添加し、混合機の回転速度を25〜30rpmに設定して15分間混合した。その後、圧縮性試験は日本粉末冶金工業会で定められたJPMA−P−13−1992「金属圧粉体の抜出力測定方法」に準拠し、圧粉試験用標準金型(内径φ:11.285mm、有効長:60mm)を用いた。具体的には、調製した混合粉末を7.0g精秤し、これを上記圧粉試験用金型のキャビティーに流し込み、上下パンチで挟み込んで成形荷重800MPaで圧縮し、上パンチのみ抜き取り円筒キャップをかぶせて抜出し圧を測定した。成形体の直径及び高さをノギスで測定して曲面の面積を求め、成形密度と単位面積あたりの応力、すなわち抜出し圧を求めて比較した。なお、成型密度の値は高いほどよく、抜出し圧の値は低いほどよい。
同じ組成であるが製造方法が異なる実施例7と実施例13の潤滑剤について、その結晶構造を確認するために、X線結晶構造解析と示差走査熱量測定を行った。測定に使用した機器は以下の通りである。それぞれの測定結果を図1〜図4に示す。
X線解析装置(XRD):Multi Flex(株式会社リガク社製)
示差走査熱量計(DSC):DSC6200(セイコーインスツル株式会社製)
A−1:オレイン酸アミド
A−2:パルミチン酸アミド
A−3:ステアリン酸アミド
B−1:N,N’−エチレンビス(オレイン酸アミド)
B−2:N,N’−エチレンビス(ステアリン酸アミド)
B−3:N,N’−プロピレンビス(ステアリン酸アミド)
C−1:菜種油(パルミチン酸3%、ステアリン酸1%、オレイン酸24%、リノール酸15%、リノレン酸7%、ガドレイン酸12%、エルカ酸35%、その他3%)
C−2:大豆油(パルミチン酸11%、ステアリン酸4%、オレイン酸23%、リノール酸53%、リノレン酸8%、その他1%)
C−3:ひまし油(ステアリン酸1%、オレイン酸3%、リノール酸4%、リシノレイン酸90%、その他2%)
C−4:牛脂(ミリスチン酸3%、パルミチン酸26%、パルミトレイン酸3%、ステアリン酸22%、オレイン酸39%、リノール酸2%、その他5%)
C−5:オレイン酸モノグリセリド(一般式(3)においてR5及びR6は水素原子、R7はオレイン酸残基)
C−6:ジオレイン酸モノグリセリド(一般式(3)においてR5は水素原子、R6及びR7はオレイン酸残基)
C−7:ポリエチレンワックス(重量平均分子量8000)
C−8:ポリエチレングリコール(重量平均分子量11000)
C−9:グリセリン
C−10:エチレングリコールジオレート
以上の結果より、実施例7は準安定なα相を含まず、結晶性の高い安定なβ相のみで構成され、実施例13は準安定なα相を含む結晶構造であることが確認できた。
Claims (6)
- 下記の一般式(1)で表される脂肪酸アミド(A)、下記の一般式(2)で表されるN,N’−アルキレンビス脂肪酸アミド(B)及び下記の一般式(3)で表される脂肪酸グリセリド(C)を含有することを特徴とする金属粉末冶金用潤滑剤組成物。
- 脂肪酸アミド(A)とN,N’−アルキレンビス脂肪酸アミド(B)との比が、質量比で(A)/(B)=1/9〜9/1であり、(A)、(B)及び脂肪酸グリセリド(C)の合計量に対して、(C)の割合が0.5〜10質量%であることを特徴とする請求項1に記載の金属粉末冶金用潤滑剤組成物。
- 脂肪酸グリセリド(C)のR 8 が、炭素数11〜23のヒドロキシアルキル基またはヒドロキシアルケニル基であることを特徴とする請求項1または2に記載の金属粉末冶金用潤滑剤組成物。
- 潤滑剤組成物の形状が、メディアン径5〜100μmの微粒子であることを特徴とする請求項1〜3のいずれかに記載の金属粉末冶金用潤滑剤組成物。
- (i)下記の一般式(1)で表される脂肪酸アミド(A)、下記の一般式(2)で表されるN,N’−アルキレンビス脂肪酸アミド(B)及び下記の一般式(3)で表される脂肪酸グリセリド(C)を含む混合物を該混合物が融解する温度以上に加熱する工程、および(ii)該混合物をスプレー噴霧する工程を含むことを特徴とする金属粉末冶金用潤滑剤組成物の製造方法。
- 前記混合物をスプレー噴霧する工程は、40℃以上かつ該混合物が融解する温度未満の雰囲気で行われ、その後自然冷却する工程をさらに含む、請求項5に記載の金属粉末冶金用潤滑剤組成物の製造方法。
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