CN1651603A - Method of improving vacuum plasma spray coating boron carbide coating layer strength - Google Patents
Method of improving vacuum plasma spray coating boron carbide coating layer strength Download PDFInfo
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- CN1651603A CN1651603A CN 200510023896 CN200510023896A CN1651603A CN 1651603 A CN1651603 A CN 1651603A CN 200510023896 CN200510023896 CN 200510023896 CN 200510023896 A CN200510023896 A CN 200510023896A CN 1651603 A CN1651603 A CN 1651603A
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Abstract
A process for increasing the adhesion of coated boron carbide layer generated by vacuum plasma spray features that a Ti layer (30-100 microns in thickness) is prepared between the coated B4C layer (200-500 microns in thickness) and substrate made of stainless steel or low-alloy steel. The adhesion is increased by 40-60%.
Description
Technical field
The present invention relates to a kind of method that improves vacuum plasma spray coating boron carbide coating layer strength, belong to anti-nuclear radiation and abrasion-resistant coating material field.
Background technology
Norbide (B
4C) be the extremely strong non-oxide ceramics of a kind of covalent linkage, have characteristics such as high-melting-point, low density, high rigidity, high elastic coefficient, can be used as high-abrasive material and anti-nuclear radiation material.At substrate surfaces such as stainless steel, low alloy steel deposition B
4The C coating can the wear-resisting and anti-nuclear radiation performance that metal base favorable mechanical performance and processability and coating is good combine.Preparation B
4The main method of C coating has: chemical vapor deposition (CVD), reaction-sintering and plasma spraying etc.Wherein plasma spraying because have jet temperature height, coat-thickness is controlled, bonding strength is high and characteristics such as easy to operate, is considered to prepare B
4The effective ways of C coating [1.Bianchi L, Brelivet P, Freslon A.Plasma sprayed boron carbide coatings as first wall materials for laser fusiontarget chamber.Proceedings of the 15
ThInternational thermal spray conference, 25-29 May 1998, Nice, France, p945-950].But, because B
4There are problems such as high temperature oxidation and gasification in C in spraying process, air plasma spraying can not be prepared well behaved B
4The C coating.Someone developed a kind of extraordinary resist technology [2. Ceng Yi, Zhang Yefang, Ding Chuanxian. the research of plasma spray coating boron carbide coating thermal shock resistance properties. silicate journal, 1999,27 (5): 545-550], under protection of inert gas, carry out plasma spraying, successfully obtain B
4The C coating, but still there is partial oxidation products in the coating.
Vacuum plasma spray coating has characteristics such as spray booth atmosphere is controlled, jet speed is fast.The coatings prepared oxygen level is low, composition and powder are comparatively approaching.Adopt the vacuum plasma spray coating method, avoided the oxidative phenomena in the atmosphere spraying, can successfully prepare and not contain B
2O
3B
4The C coating.
But, B
4There is notable difference in thermal expansivity between C coating and stainless steel (or low alloy steel) base material.B
4The C thermal linear expansion coefficient only is 5.2 * 10
-6K
-1, and stainless steel (or low alloy steel) thermal linear expansion coefficient is bigger, reaches 16.5 * 10 as 304 stainless steels
-6K
-1Coefficient of thermal expansion mismatch between coating and the base material causes in the spraying process thermal stresses to be concentrated at the interface at the two, influences combining of coating and base material.Someone adopts the nickel chromium triangle middle layer to prepare vacuum plasma spray coating B at stainless steel surface
4C coating, but because the thermal expansivity (about 14 * 10 of nicr layer
-6K
-1) more approaching with stainless steel substrate, the bonding strength of boron carbide coating that contains the nickel chromium triangle middle layer is still not ideal enough, only be 30-43Mpa[3.Doring J E, Vaben R, Linke J, et al.Properties of plasma sprayed boron carbideprotective coatings for the first wall in fusion experiments.Journal of NuclearMaterials, 2002,307-311:121-125].
Summary of the invention
The object of the invention is to provide a kind of raising vacuum plasma spray coating B
4The method of C anchoring strength of coating.The present invention prepares B on stainless steel (or low alloy steel) base material
4During the C coating, adopt the Ti coating as the middle layer.
The thermal linear expansion coefficient of Ti is 8.4 * 10
-6K
-1, between B
4Between C and the stainless steel (or low alloy steel), and and B
4C is more approaching.Adopt the Ti layer as the middle layer between the two, can relax Coefficient of Thermal Expansion mismatch problem between coating and the base material, reduce thermal stresses, improve Bond Strength of Coating.Simultaneously, in vacuum plasma spray coating, this bonding strength on stainless steel (or low alloy steel) base material of Ti coating is higher, and this also provides assurance for improving combining between coating and the base material.
Synoptic diagram shown in Figure 1 is design of the present invention.1 is stainless steel (or low alloy steel) base material among the figure, and 2 is the Ti middle layer, and 3 is B
4The C coating.During spraying, stainless steel (or low alloy steel) base material is cleaned, after the pre-treatment such as sandblast, adopts vacuum plasma spray coating one deck Ti coating, and then carry out B
4The spraying of C coating can obtain to contain the B in Ti middle layer
4The C coating.(spray parameters sees table 1 for details)
Stainless steel of the present invention is as 304 stainless steels commonly used, 321 stainless steels etc.; Low alloy steel is as 16Mn steel, 15MnV steel etc.
Stainless steel of the present invention (or low alloy steel) and B
4The thickness that C is coated with interlayer Ti middle layer is the 30-100 micron, B
4The C coat-thickness is the 200-500 micron.The Ti powder footpath of using during spraying is 10-80 micron, B
4The C powder diameter is the 10-70 micron.The vacuum plasma spray coating processing parameter is as shown in table 1.
Prepared B among the present invention
4The C coating is because preparation technology's control makes it to have the high characteristics of bonding strength.Its bonding strength and the B that does not have the Ti middle layer
4The C coating is compared and can be improved 40-60%.
Table 1 vacuum plasma spray coating parameter area
Ti middle layer B
4The C coating
1. vacuum chamber pressure/handkerchief 10,000-30,000 40,000-90,000
2. spray gas argon flow amount/liter/minute 35-50 30-42
3. spray gaseous hydrogen airshed/liter/minute 8-15 8-17
4. spray distance/millimeter 200-300 120-250
5. powder feeding carrier gas argon flow amount/liter/minute 2-4 2-4
6. electric current/ampere 550-650 550-650
7. voltage/volt 52-63 52-63
Description of drawings
Fig. 1 contains the B in Ti middle layer
4C coating synoptic diagram: 1 is stainless steel (or low alloy steel) base material among the figure, and 2 is the Ti middle layer, and 3 is B
4The C coating.
Fig. 2 is the prepared B that contains the Ti middle layer of embodiment 1
4The C anchoring strength of coating: left side square frame is not for containing the B in Ti middle layer among the figure
4C Bond Strength of Coating scope, right side square frame are the B that contains the Ti middle layer
4C Bond Strength of Coating scope.
Fig. 3 contains the B in Ti middle layer
4C is coated with the layer cross section metallograph: 1 is stainless steel substrate among the figure, and 2 is the Ti middle layer, and 3 is B
4The C coating.
Fig. 4 is the prepared B that contains the Ti middle layer of embodiment 2
4The C anchoring strength of coating: left side square frame is not for containing the B in Ti middle layer among the figure
4C Bond Strength of Coating scope, right side square frame are the B that contains the Ti middle layer
4C Bond Strength of Coating scope.
Fig. 5 is the prepared B that contains the Ti middle layer of embodiment 3
4The C anchoring strength of coating: left side square frame is not for containing the B in Ti middle layer among the figure
4C Bond Strength of Coating scope, right side square frame are the B that contains the Ti middle layer
4C Bond Strength of Coating scope.
Fig. 6 is the prepared B that contains the Ti middle layer of embodiment 4
4The C anchoring strength of coating: left side square frame is not for containing the B in Ti middle layer among the figure
4C Bond Strength of Coating scope, right side square frame are the B that contains the Ti middle layer
4C Bond Strength of Coating scope.
Embodiment
Further illustrate characteristics of the present invention and effect below by embodiment.Limit the present invention absolutely not.
It is the Ti powder of 10-80 micron and the B of 10-70 micron that embodiment 1 adopts particle diameter
4The C powder is as dusty spray.With through 304 stainless steels of ethanol ultrasonic cleaning, emergy sandblasting as base material.After reducing to the vacuum tightness of vacuum chamber below the 0.05mbar, fill shielding gas Ar gas to certain pressure.Under the spray parameters shown in the table 2, the vacuum plasma spray coating system that uses Switzerland Sulzer Metco company earlier with the Ti coating spraying on stainless steel substrate, and then spraying B
4The C coating.For effect more of the present invention, prepared the B that does not contain the Ti intermediate layer simultaneously
4The C coating.Use the ASTMC-633 method and measured Bond Strength of Coating, the results are shown in Figure 2.As seen from the figure, after having increased the Ti middle layer, B
4The average bonding strength of C coating increases to 50MPa from 32MPa.Fig. 3 is the B that contains the Ti middle layer
4C is coated with the layer cross section metallograph.Fig. 3 shows, Ti middle layer and B
4Combination between C layer and the stainless steel substrate is all good.
Table 2 vacuum plasma spray coating parameter
Ti middle layer B
4The C coating
Vacuum chamber pressure/handkerchief 10,000 50,000
Spraying gas argon flow amount/liter/minute 40 38
Spraying gaseous hydrogen airshed/liter/minute 10 10
Spray distance/millimeter 300 200
Powder feeding carrier gas argon flow amount/liter/minute 23
Electric current/ampere 600 600
Voltage/volt 56 57
Coat-thickness/micron 50 400
Table 3 vacuum plasma spray coating parameter
Ti middle layer B
4The C coating
Vacuum chamber pressure/handkerchief 10,000 80,000
Spraying gas argon flow amount/liter/minute 38 32
Spraying gaseous hydrogen airshed/liter/minute 12 15
Spray distance/millimeter 270 170
Powder feeding carrier gas argon flow amount/liter/minute 23
Electric current/ampere 650 650
Voltage/volt 58 60
Coat-thickness/micron 80 400
Embodiment 4 adopts Ti and the B with embodiment 1 same particle size
4The C powder is as dusty spray.Under the spray parameters identical, on the 16Mn steel substrate, prepare B with embodiment 2
4The C coating.Bond Strength of Coating is seen Fig. 6.As seen from the figure, after having increased the Ti middle layer, B
4The average bonding strength of C coating increases to 54MPa from 37MPa.
Claims (4)
1, a kind of raising vacuum plasma spray coating B
4The method of C anchoring strength of coating is characterized in that at B
4Adopt the Ti coating as the middle layer between C coating and stainless steel or low alloy steel base material.
2, by the described raising vacuum plasma spray coating of claim 1 B
4The method of C anchoring strength of coating, the thickness that it is characterized in that described Ti middle layer is the 30-100 micron, B
4The thickness of C coating is the 200-500 micron.
3, by claim 1 or 2 described raising vacuum plasma spray coating B
4The method of C anchoring strength of coating, the processing parameter that it is characterized in that described vacuum plasma spray coating Ti middle layer is a vacuum chamber pressure 10000-30000 handkerchief; Spraying gas argon flow amount 35-50 liter/minute, spraying gaseous hydrogen airshed 8-15 liter/minute, spray distance 200-300 millimeter, powder feeding carrier gas argon flow amount 2-4 liter/minute; Employed Ti powder diameter is the 10-80 micron.
4, by claim 1 or 2 described raising vacuum plasma spray coating B
4The method of C anchoring strength of coating is characterized in that described vacuum plasma spray coating B
4The processing parameter of C coating is that vacuum chamber pressure is the 40000-90000 handkerchief; Spraying gas argon flow amount 30-42 liter/minute, spraying gaseous hydrogen airshed 8-17 liter/minute, spray distance 120-250mm, powder feeding carrier gas argon flow amount be the 2-4 liter/minute; Employed B
4The C powder diameter is the 10-70 micron.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100238966A CN100336939C (en) | 2005-02-06 | 2005-02-06 | Method of improving vacuum plasma spray coating boron carbide coating layer strength |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100238966A CN100336939C (en) | 2005-02-06 | 2005-02-06 | Method of improving vacuum plasma spray coating boron carbide coating layer strength |
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|---|---|
| CN1651603A true CN1651603A (en) | 2005-08-10 |
| CN100336939C CN100336939C (en) | 2007-09-12 |
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|---|---|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102953086A (en) * | 2011-08-19 | 2013-03-06 | 贵阳铝镁设计研究院有限公司 | Anode carbon block set resistance-reducing structure |
| CN103540889A (en) * | 2012-07-09 | 2014-01-29 | 中国科学院微电子研究所 | Method for preparing boron carbide coating by low-pressure plasma spraying technology |
| CN105624602A (en) * | 2014-10-28 | 2016-06-01 | 北京美桥电子设备有限公司 | Y applied to aluminum-based base material3Al5O12Method for producing a coating |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11236286A (en) * | 1997-12-15 | 1999-08-31 | Ngk Insulators Ltd | Production of boron carbide coating |
| JPH11286386A (en) * | 1998-03-31 | 1999-10-19 | Nippon Steel Corp | Installation device and installation work for large structure |
| CN1157493C (en) * | 2000-12-29 | 2004-07-14 | 北京科技大学 | Functional gradient boron carbide/copper coating material and its prepn |
| CN1554798A (en) * | 2003-12-26 | 2004-12-15 | 中国科学院上海硅酸盐研究所 | Process for preparing plasma sprayed Boron carbide coating material |
-
2005
- 2005-02-06 CN CNB2005100238966A patent/CN100336939C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102953086A (en) * | 2011-08-19 | 2013-03-06 | 贵阳铝镁设计研究院有限公司 | Anode carbon block set resistance-reducing structure |
| CN102953086B (en) * | 2011-08-19 | 2016-06-22 | 贵阳铝镁设计研究院有限公司 | Low-resistance structure drops in anode block group |
| CN103540889A (en) * | 2012-07-09 | 2014-01-29 | 中国科学院微电子研究所 | Method for preparing boron carbide coating by low-pressure plasma spraying technology |
| CN105624602A (en) * | 2014-10-28 | 2016-06-01 | 北京美桥电子设备有限公司 | Y applied to aluminum-based base material3Al5O12Method for producing a coating |
| CN105624602B (en) * | 2014-10-28 | 2018-11-02 | 北京美桥电子设备有限公司 | Y applied to aluminum-based base material3Al5O12Method for producing a coating |
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| Publication number | Publication date |
|---|---|
| CN100336939C (en) | 2007-09-12 |
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Granted publication date: 20070912 Termination date: 20130206 |