CN1273637C - 用于热涂布基材的金属粉末 - Google Patents
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Abstract
本发明涉及扩散合金金属粉末用于热涂布基材的用途。所述粉末含有预合金的铁基料粉末颗粒,其具有扩散合金到所述基料粉末颗粒上的钼颗粒。
Description
发明领域
本发明涉及热喷涂粉末及其制备和应用。特别是,本发明涉及用于热涂布铝基材的喷涂粉末。
发明背景
已知多种不同的在铝基材上制备涂层的方法。这些方法用于,例如具有通过热喷涂形成的气缸衬里的铝发动机部件。
美国专利No.2588422公开了一种具有通过热喷涂形成的气缸衬里的铝发动机部件。这些衬里在未经处理的发动机部件表面上以两层的方式形成,顶层是坚硬的滑动层,如约1毫米厚的钢层,底层是约50微米厚的二价钼的夹层。包含至少60%的钼的夹层不构成滑动层,但是必须有该层,以便将坚硬的滑动层粘合到铝部件上。优选,夹层由纯钼组成。滑动层是硬金属层,例如碳钢、青铜或不锈钢,其中钢可以是例如包含镍、铬、钒或者钼的合金。原则上,这种双层结构能提供优良的滑动层,但是双涂层的成本相当高。
在最近的热喷涂法中,用粉末状钢与粉末状钼的混合物组成热喷涂粉末,如美国专利No.6095107中所描述的。然而问题是,由于基料钢粉末和碾碎的钼粉末之间的性能差异会出现分离的危险,这可能产生不均匀的涂层。另一个缺点是,由于分离效果而需要相对大量的钼。
发明目的
本发明的主要目的是提供一种用于热涂布基材,特别是铝的便宜的金属粉末。
本发明的另一个目的是提供一种不会分离的粉末,并且该粉末中的昂贵的钼合金化金属的量与现在使用的方法相比有所减少。
本发明的进一步的目的是提供一种热粉末,其具有高沉积效率并且能得到优良的涂层品质。
本发明的另一个目的是提供一种热粉末,其能得到具有适合孔隙度和氧化物含量的涂层,并且其中的孔隙主要是封闭且隔离的,并且具有有利的孔隙直径范围。
发明概述
用含有预合金的铁基料粉末的金属粉末达到了这些目的,所述铁基料粉末具有扩散合金到基料粉末颗粒上的钼颗粒,如还原的三氧化钼。
本发明主要涉及以下几项内容:
(1)金属粉末用于热涂布基材的用途,所述粉末基本上由预合金的铁基料粉末颗粒组成,所述铁基料粉末颗粒具有扩散合金到该基料粉末颗粒上的钼颗粒,其中所述钼颗粒源于还原的三氧化钼,并且其中扩散合金到基料粉末颗粒上的钼的量至少是金属粉末的2wt%。
(2)上述(1)的用途,其中扩散合金到基料粉末颗粒上的钼的量高于金属粉末的4wt%。
(3)上述(1)的的用途,其中扩散合金到基料粉末颗粒上的钼的量为金属粉末的2-15wt%。
(4)上述(1)的用途,其中扩散合金到基料粉末颗粒上的钼的量为金属粉末的3-10wt%。
(5)用于热涂布基材的金属粉末,所述粉末基本上由预合金的铁基料粉末颗粒组成,所述铁基料粉末颗粒具有扩散合金到该基料粉末颗粒上的钼颗粒,其中所述钼颗粒源于还原的三氧化钼,并且其中扩散合金到基料粉末颗粒上的钼的量至少是金属粉末的3wt%。
(6)上述(5)的粉末,其中扩散合金到基料粉末颗粒上的钼的量为金属粉末的3-10wt%。
(7)上述(5)的粉末,其中预合金的基料粉末是气体粉化的粉末。
(8)上述(5)的粉末,其中预合金的基料粉末是水粉化的粉末。
(9)上述(5)的粉末,其中预合金的基料粉末包含选自C、Si、Mn、Cr、V和W的元素。
(10)上述(5)-(9)任一项的粉末,其具有的粒径小于500微米。
(11)上述(5)-(9)任一项的粉末,其具有的粒径为25-210微米。
(12)上述(5)-(9)任一项的粉末,其具有的粒径小于90微米。
(13)上述(5)-(9)任一项的粉末,其具有的粒径小于65微米。
发明详述
根据所希望的最终涂层以及基材的性能来选择铁基料粉末的类型和粒径。基料粉末优选与希望在涂层中的元素进行预合金。也可将钼含量的一小部分包含在预合金粉末中。预合金基料粉末可包含的其它元素是C、Si、Mn、Cr、V和W。可通过使用水或气体进行粉化(atomisation)来制备预合金粉末。对于PTA,基料粉末的粒径小于500微米,优选为25-210微米;对于HVOF或等离子喷涂,基料粉末的粒径小于90微米,优选小于65微米。
根据本发明,将基料粉末和合金粉末即合金元素源(优选是三氧化钼)按照规定的配方进行混合,并且将混合物加热到低于所得混合物熔点的温度。该温度应足够高,以确保合金元素充分地扩散进入铁基料粉末,以便形成部分或扩散合金化粉末。另一方面,该温度应低于完全预合金所需的温度。通常,该温度为700-1000℃,优选为750-900℃,还原在还原气氛例如氢气中进行30分钟至2小时以还原三氧化钼,三氧化钼是优选的钼源。可以使用作为另一可选钼源的金属钼。从例如日本专利公开8-209202、63-137102和3-264642中可知,关于这一点可提到具有扩散合金到基料粉末颗粒上的钼的金属粉末。然而,在粉末冶金工业中使用这些已知的粉末来制备各种形状和大小的烧结制品。此外,与本发明的粉末相反,这些已知的粉末经常不仅具有扩散合金到基料粉末颗粒上的钼,而且具有扩散合金到基料粉末颗粒上的铜和/或镍。在这些已知的粉末中,扩散合金化的钼的含量通常很低,而在用于热涂布的本发明的粉末中,扩散合金化的钼含量应该高,以便产生有效的滑动。迄今,已经由扩散合金化的钼含量超过约4wt%的粉末得到了最令人感兴趣的结果。也应注意,在本发明的用于热喷涂的粉末中,仅仅是钼扩散合金到基料粉末颗粒上。这种扩散合金化的钼的上限取决于基料颗粒能够负载多少钼,大约为15wt%,参见下文。
最终热喷涂粉末的粒径基本上与预合金基料粉末的粒径相同,因为还原三氧化钼时获得的钼颗粒与基料粉末颗粒相比是很小的。扩散合金到基料粉末上的Mo的量应该至少是粉末组合物总量的2wt%。优选Mo的量为2-15wt%,最优选为3-10wt%。
将扩散合金化粉末施用到金属基基材上的不同方法是喷涂或焊镀(weld cladding)法,如火焰喷涂、HVOF和等离子喷涂或PTA。
用下列制备和实施例进一步说明本发明,但是不是对其进行限制。
实施例
对用于热涂布的基于水粉化的Fe基(Fe-3Cr-0.5Mo)+5%Mo的新材料进行实验。
使用的基料和化学分析:
水粉化的铁粉末(Fe-3Cr-0.5Mo)-71微米
三氧化钼MoO3(平均粒径3-7微米)
化学分析(Fe-3Cr-0.5Mo) | |
% | |
0-合计 | 1.22 |
C | 0.48 |
Fe | 基料 |
Ni | 0.05 |
Mo | 0.52 |
Mn | 0.10 |
S | 0.01 |
P | 0.01 |
Cr | 2.95 |
Si | <0.01 |
筛析(Fe-3Cr-0.5Mo) | |
微米 | % |
71-106 | 0.1 |
63-71 | 0.8 |
53-63 | 4.7 |
45-53 | 23.4 |
36-45 | 23.1 |
20-36 | 33.3 |
-20 | 14.6 |
步骤
在Ldige混合器中将92.46%的水粉化的(Fe-3Cr-0.5Mo粉末)和7.54%的MoO3一起混合,并在如下的条件下进行退火:
温度:820℃
时间:60分钟
气氛:还原气氛(类型:H2、N2、CO2以及这些气体的混合物)
退火后,将粉末块碾碎并筛分,使其粒径小于75微米。
筛析和化学组成(退火后的粉末混合物):
化学分析(Fe-3Cr-0.5Mo) | |
% | |
0-合计 | 1.5 |
C | 0.60 |
Fe | 基料 |
Ni | 0.05 |
Mo | 5.57 |
Mn | 0.10 |
S | 0.01 |
P | 0.01 |
Cr | 2.75 |
Si | <0.1 |
筛析(Fe-3Cr-0.5Mo) | |
微米 | % |
71-106 | 0.1 |
63-71 | 1.4 |
53-63 | 6.5 |
45-53 | 34.1 |
36-45 | 20.4 |
20-36 | 30.8 |
-20 | 6.7 |
将所得粉末用于等离子喷涂法,以涂布A1基基材。用最少量的Mo获得了出人意料的均匀且优良的涂层。图1是含有扩散合金到基料粉末颗粒表面上的钼的粉末的显微图。图2公开了涂层。
Claims (13)
1.金属粉末用于热涂布基材的用途,所述粉末基本上由预合金的铁基料粉末颗粒组成,所述铁基料粉末颗粒具有扩散合金到该基料粉末颗粒上的钼颗粒,其中所述钼颗粒源于还原的三氧化钼,并且其中扩散合金到基料粉末颗粒上的钼的量至少是金属粉末的2wt%。
2.权利要求1的用途,其中扩散合金到基料粉末颗粒上的钼的量高于金属粉末的4wt%。
3.权利要求1的用途,其中扩散合金到基料粉末颗粒上的钼的量为金属粉末的2-15wt%。
4.权利要求1的用途,其中扩散合金到基料粉末颗粒上的钼的量为金属粉末的3-10wt%。
5.用于热涂布基材的金属粉末,所述粉末基本上由预合金的铁基料粉末颗粒组成,所述铁基料粉末颗粒具有扩散合金到该基料粉末颗粒上的钼颗粒,其中所述钼颗粒源于还原的三氧化钼,并且其中扩散合金到基料粉末颗粒上的钼的量至少是金属粉末的3wt%。
6.权利要求5的粉末,其中扩散合金到基料粉末颗粒上的钼的量为金属粉末的3-10wt%。
7.权利要求5的粉末,其中预合金的基料粉末是气体粉化的粉末。
8.权利要求5的粉末,其中预合金的基料粉末是水粉化的粉末。
9.权利要求5的粉末,其中预合金的基料粉末还包含选自C、Si、Mn、Cr、V和W的元素。
10.权利要求5-9任一项的粉末,其具有的粒径小于500微米。
11.权利要求5-9任一项的粉末,其具有的粒径为25-210微米。
12.权利要求5-9任一项的粉末,其具有的粒径小于90微米。
13.权利要求5-9任一项的粉末,其具有的粒径小于65微米。
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ITMI20042500A1 (it) * | 2004-12-23 | 2005-03-23 | Sued Chemie Mt Srl | Processo per la preparazione di un catalizzatore per l'ossidazione del metanolo a formaldeide |
US9546412B2 (en) | 2008-04-08 | 2017-01-17 | Federal-Mogul Corporation | Powdered metal alloy composition for wear and temperature resistance applications and method of producing same |
US9162285B2 (en) | 2008-04-08 | 2015-10-20 | Federal-Mogul Corporation | Powder metal compositions for wear and temperature resistance applications and method of producing same |
US9624568B2 (en) | 2008-04-08 | 2017-04-18 | Federal-Mogul Corporation | Thermal spray applications using iron based alloy powder |
CN103409652A (zh) * | 2013-07-12 | 2013-11-27 | 上海川禾实业发展有限公司 | 一种以钼氧化物表面改性金属粉体制备钼合金材料的方法 |
CN105648384B (zh) * | 2016-01-14 | 2018-07-13 | 北京工业大学 | 一种用于制备铁基涂层的粉芯丝材及其涂层制备方法 |
CN110695367A (zh) * | 2019-10-29 | 2020-01-17 | 金堆城钼业股份有限公司 | 一种钼钨合金粉的制备方法 |
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JPS63137102A (ja) * | 1986-11-28 | 1988-06-09 | Sumitomo Metal Ind Ltd | 粉末冶金用合金粉末 |
CA1337468C (en) * | 1987-08-01 | 1995-10-31 | Kuniaki Ogura | Alloyed steel powder for powder metallurgy |
WO1989002802A1 (en) * | 1987-09-30 | 1989-04-06 | Kawasaki Steel Corporation | Composite alloy steel powder and sintered alloy steel |
JPH03264642A (ja) * | 1990-03-14 | 1991-11-25 | Kawasaki Steel Corp | 鉄基高強度焼結体の製造方法 |
US5240742A (en) * | 1991-03-25 | 1993-08-31 | Hoeganaes Corporation | Method of producing metal coatings on metal powders |
US5334235A (en) * | 1993-01-22 | 1994-08-02 | The Perkin-Elmer Corporation | Thermal spray method for coating cylinder bores for internal combustion engines |
SE513498C2 (sv) * | 1993-09-01 | 2000-09-18 | Kawasaki Steel Co | Atomiserat stålpulver och sintrat stål med god maskinbearbetbarhet tillverkat därav |
JP3294980B2 (ja) * | 1994-11-28 | 2002-06-24 | 川崎製鉄株式会社 | 切削性に優れた高強度焼結材料用合金鋼粉 |
ATE192784T1 (de) * | 1995-10-31 | 2000-05-15 | Volkswagen Ag | Verfahren zum herstellen einer gleitfläche auf einem metallischen werkstück |
US6068813A (en) * | 1999-05-26 | 2000-05-30 | Hoeganaes Corporation | Method of making powder metallurgical compositions |
ATE317458T1 (de) * | 1999-11-04 | 2006-02-15 | Hoeganaes Corp | Herstellungsverfahren für verbesserte metallurgische pulverzusammensetzung und nutzung derselbe |
-
2001
- 2001-05-18 SE SE0101776A patent/SE0101776D0/xx unknown
- 2001-07-10 US US09/900,982 patent/US20020197500A1/en not_active Abandoned
-
2002
- 2002-05-17 ES ES02733701T patent/ES2362753T3/es not_active Expired - Lifetime
- 2002-05-17 JP JP2003544235A patent/JP4373785B2/ja not_active Expired - Fee Related
- 2002-05-17 KR KR1020037014963A patent/KR100875327B1/ko not_active IP Right Cessation
- 2002-05-17 CN CNB028101421A patent/CN1273637C/zh not_active Expired - Fee Related
- 2002-05-17 MX MXPA03010508A patent/MXPA03010508A/es active IP Right Grant
- 2002-05-17 BR BR0211183-7A patent/BR0211183A/pt not_active Application Discontinuation
- 2002-05-17 CA CA002447304A patent/CA2447304C/en not_active Expired - Fee Related
- 2002-05-17 RU RU2003136423/02A patent/RU2280708C2/ru not_active IP Right Cessation
- 2002-05-17 WO PCT/SE2002/000943 patent/WO2003042422A1/en active Application Filing
- 2002-05-17 DE DE60239603T patent/DE60239603D1/de not_active Expired - Lifetime
- 2002-05-17 EP EP02733701A patent/EP1390555B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
RU2280708C2 (ru) | 2006-07-27 |
US20020197500A1 (en) | 2002-12-26 |
KR20040068466A (ko) | 2004-07-31 |
MXPA03010508A (es) | 2005-03-07 |
KR100875327B1 (ko) | 2008-12-22 |
JP4373785B2 (ja) | 2009-11-25 |
CA2447304C (en) | 2008-02-12 |
CN1524131A (zh) | 2004-08-25 |
DE60239603D1 (de) | 2011-05-12 |
EP1390555B1 (en) | 2011-03-30 |
WO2003042422A1 (en) | 2003-05-22 |
EP1390555A1 (en) | 2004-02-25 |
JP2005509742A (ja) | 2005-04-14 |
BR0211183A (pt) | 2004-08-10 |
ES2362753T3 (es) | 2011-07-12 |
RU2003136423A (ru) | 2005-05-10 |
SE0101776D0 (sv) | 2001-05-18 |
CA2447304A1 (en) | 2003-05-22 |
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