CN102953027A - Toughening method for high thermal insulation and anti-sintering thermal barrier coating - Google Patents
Toughening method for high thermal insulation and anti-sintering thermal barrier coating Download PDFInfo
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- CN102953027A CN102953027A CN2012104359283A CN201210435928A CN102953027A CN 102953027 A CN102953027 A CN 102953027A CN 2012104359283 A CN2012104359283 A CN 2012104359283A CN 201210435928 A CN201210435928 A CN 201210435928A CN 102953027 A CN102953027 A CN 102953027A
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Abstract
The invention relates to a toughening method for a high thermal insulation and anti-sintering thermal barrier coating, wherein laser is adopted to induce the internal of a surface ceramic layer of a dual ceramic layer thermal barrier coating coated through a plasma spray coating method to generate damage or cracks perpendicular to a substrate. The specific method comprises: adopting a laser beam to heat a surface ceramic layer of a dual ceramic layer thermal barrier coating in a direction perpendicular to a coating direction, wherein a laser beam width is 150 mum, a laser beam power (W)/scanning speed (m/s) p/v is more than or equal to 7.11 and is less than or equal to 10.68, and a laser beam spacing is 3 mm. With the present invention, thermal stress between the two layers of the ceramic can be released on the basis of maintenance of high thermal insulation capacity of the dual ceramic layer thermal barrier coating prepared by the plasma spray coating process, disadvantages of low thermal expansion coefficient and low strain bearing capacity of the surface ceramic can be overcome, and a service life of the dual ceramic layer thermal barrier coating can be prolonged.
Description
Technical field
The present invention relates to the method for toughening of thermal barrier coating, particularly a kind of method for toughening of high heat insulation anti-sintering thermal barrier coating.
Background technology
Thermal barrier coating (TBC) is a kind of advanced person's stupalith system, is mainly used on the hot metal element of internal combustion turbine and aircraft engine, such as combustion chamber and turbine blade.The material of turbine blade is nickel base superalloy, and the temperature limitation that can bear is about 1100 ℃, far below the temperature out of combustion gas.For addressing this problem, people have developed thermal barrier coating system, this system is by ceramic coating, superalloy substrate, substrate and be coated with the tack coat (BC) of interlayer and the thermal growth oxide layer take aluminum oxide as main component (TGO) that forms forms between ceramic coating and transition layer.
The method for toughening of thermal barrier coating mainly contains two kinds of plasma spraying (APS) and electro beam physics vapour depositions (EB-PVD).The made TBC of EB-PVD technique is the column crystal microtexture in vertical matrix direction, and its strain ability to bear is strong, and is high with the bonding strength of matrix, but involves great expense, and deposition is low.Be wave platy layer structure on the made TBC microcosmic of APS technique, porosity is higher, heat-proof quality is good, deposition is high, cost is lower, but its strain ability to bear a little less than, more space forms easily crackle and causes coating to lose efficacy, especially the easier inefficacy of the made TBC of APS when the strain ability to bear of coated material itself is weak the present invention is based on APS technique and designs.
In order to reach higher thrust-weight ratio, the temperature out of combustion gas is constantly soaring, and the heat insulation requirement of TBC is also improved constantly.Traditional ceramic coating material is 8% yttrium partially stabilized zirconium white (8YSZ), can not satisfy the heat insulation requirement that improves constantly.In recent years, two ceramic layer TBC are prolonged the thermal shock life-span simultaneously by the service temperature that experiment confirm can improve coating.
Two ceramic layer TBC have two ceramic layers: the inner ceramic layer is zirconium white (8YSZ) material, and its advantage is that fracture toughness property is high, thermal expansivity is large, and shortcoming is the easy phase transformation of high temperature, anti-caking power is relatively poor, thermal conductivity is higher.Ceramic layer on surface is rare earth zirconate (LZ) material, its advantage is low, the anti-sintering of thermal conductivity, Heat stability is good, be difficult for undergoing phase transition, stable chemical nature, and shortcoming is fracture toughness property low (than 8YSZ low about 50%), thermal expansivity little (less by about 15% than 8YSZ).The design of two ceramic layers can allow two-layer ceramic have complementary functions, and makes TBC have the characteristics in high service temperature and long thermal shock life-span.
The mechanism that TBC lost efficacy is comparatively complicated, depends primarily on inner stress distribution.With respect to single ceramic layer TBC, two ceramic layer TBC have increased an interface, i.e. interface between the two ceramic layers.The thermal expansivity of inner ceramic layer is higher, fracture toughness property is higher, the strain ability to bear is stronger; The thermal expansivity of ceramic layer on surface is lower, fracture toughness property is lower, the strain ability to bear is relatively poor.As long as ceramic layer on surface and inner ceramic layer are that two ceramic layer TBC lost efficacy one of reason because thermal expansivity does not mate the thermal stresses that produces.Especially when ceramic layer on surface is made by APS technique, further weakened the strain ability to bear of ceramic layer on surface, so that the interface between the two-layer ceramic becomes a weakest ring among two ceramic layer TBC.Therefore, the strain ability to bear that how to strengthen ceramic layer on surface becomes problem demanding prompt solution in two ceramic layer TBC preparations with the thermal mismatch stress of alleviating between two-layer ceramic, prior art is to carry out the spraying of ceramic layer on surface with EB-PVD technique, although this method can improve the strain ability to bear of ceramic layer on surface but also weaken its heat-insulating capability simultaneously, and involve great expense, deposition is low.The TBC that the present invention is based on the spraying of APS technique designs.
Summary of the invention
The problem that exists in order to solve above-mentioned prior art, the object of the present invention is to provide a kind of method for toughening of high heat insulation anti-sintering thermal barrier coating, can alleviate on the basis that keeps the made pair of high heat-insulating capability of ceramic layer thermal barrier coating of plasma spray coating process the thermal stresses between two-layer ceramic, overcome the shortcoming of surface ceramic low thermal coefficient of expansion, low strain ability to bear, prolong the work-ing life of two ceramic layer thermal barrier coatings.
In order to achieve the above object, the present invention is achieved by the following technical solutions.
A kind of method for toughening of high heat insulation anti-sintering thermal barrier coating on the ceramic layer on surface of two ceramic layer thermal barrier coatings of plasma spraying method spraying, utilizes inner generation of induced with laser ceramic layer on surface to damage or perpendicular to the crackle of matrix.
Describedly utilize that the induced with laser ceramic layer on surface is inner to be produced damage or perpendicular to the concrete grammar of the crackle of matrix be: with laser beam with perpendicular to the coating direction in the enterprising line scanning heating of the ceramic layer on surface of two ceramic layer thermal barrier coatings.
The width of described laser beam is 150 μ m, and laser beam power W/ sweep velocity m/s is 7.11≤p/v≤10.68, and the laser beam spacing is 3mm.
The know-why that the present invention program proposes is: with laser beam with vertical coating directive effect on the ceramic layer on surface of two ceramic layer thermal barrier coatings of plasma spraying method spraying, near the expansion that can heat up rapidly of the pottery lasing point in the domed region forms the thermal expansion district as shown in drawings.Because the surface ceramic material thermal conductivity is very low for the compole weak point during heat-processed, so pottery does not almost produce volume change below the thermal expansion district in this mechanism in addition, the pottery in thermal expansion district then can produce tensile stress in the pottery thereunder.Pottery will form vertical crack or damage at the direction cracking of vertical matrix when tensile stress meets or exceeds the maximum value that surface ceramic can bear.Namely can be in the inner damage that produces sufficient amount of ceramic layer on surface or perpendicular to the crackle of matrix on the lasing point of sufficient amount, form the structure of the made thermal barrier coating of similar EB-PVD to improve the strain ability to bear of ceramic layer on surface, relief of thermal stress, thus reach the two ceramic layer thermal barrier coating of the prolongation purpose in work-ing life.
Be compared with existing technology, the present invention has following advantage:
Although the two ceramic layer Thermal Barrier Coating Technologies of existing plasma spraying can guarantee enough effect of heat insulation, but low strain ability to bear and the low thermal coefficient of expansion of ceramic layer on surface have caused larger thermal stresses, thereby make it peel off the inefficacy that finally causes coating on ceramic layer internally easily.The present invention generates vertical crack by induced with laser makes the surface ceramic coat of the two ceramic layer thermal barrier coatings of plasma spraying have higher strain ability to bear, strengthened the strain ability to bear of surface ceramic coat, reduce ceramic layer on surface and inner ceramic layer and do not mated the thermal stresses that produces because of thermal expansivity, prolonged its work-ing life on the high heat-insulating capability, the basis with low cost that keep the two ceramic layer thermal barrier coatings of plasma spraying.
Description of drawings
Fig. 1 is the inventive method synoptic diagram.
Fig. 2 is the inventive method implementation result synoptic diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is done further detailed description.
The method for toughening of a kind of high heat insulation anti-sintering thermal barrier coating of the present invention, at first adopt plasma spraying method spraying thermal barrier coating system as shown in Figure 2, be followed successively by from inside to outside tack coat, inner ceramic layer and the ceramic layer on surface of superalloy substrate, superalloy substrate and inner ceramic interlayer; Then as shown in Figure 1, adopt laser beam to heat in the enterprising line scanning of ceramic layer on surface perpendicular to the coating direction, the width of laser beam is 150 μ m, and laser beam power W/ sweep velocity m/s is 7.11≤p/v≤10.68, and the laser beam spacing is 3mm.Near expansions that can heat up rapidly of the pottery lasing point in the domed region, as shown in Figure 2, formation thermal expansion district.Because the surface ceramic material thermal conductivity is very low for the compole weak point during heat-processed, so pottery does not almost produce volume change below the thermal expansion district in this mechanism in addition, the pottery in thermal expansion district then can produce tensile stress in the pottery thereunder.Pottery will form damage or vertical crack at the direction cracking of vertical matrix when tensile stress meets or exceeds the maximum value that surface ceramic can bear.Namely can be in the inner damage that produces sufficient amount of ceramic layer on surface or perpendicular to the crackle of matrix on the lasing point of sufficient amount, form the structure of the made thermal barrier coating of similar EB-PVD to improve the strain ability to bear of ceramic layer on surface, relief of thermal stress, thus reach the two ceramic layer thermal barrier coating of the prolongation purpose in work-ing life.
Claims (3)
1. the method for toughening of a high heat insulation anti-sintering thermal barrier coating is characterized in that: on the ceramic layer on surface of two ceramic layer thermal barrier coatings of plasma spraying method spraying, utilize inner generation of induced with laser ceramic layer on surface to damage or perpendicular to the crackle of matrix.
2. the method for toughening of a kind of high heat insulation anti-sintering thermal barrier coating according to claim 1 is characterized in that: describedly utilize that the induced with laser ceramic layer on surface is inner to be produced damage or perpendicular to the concrete grammar of the crackle of matrix be: with laser beam with perpendicular to the coating direction in the enterprising line scanning heating of the ceramic layer on surface of two ceramic layer thermal barrier coatings.
3. the method for toughening of a kind of high heat insulation anti-sintering thermal barrier coating according to claim 2, it is characterized in that: the width of described laser beam is 150 μ m, and laser beam power W/ sweep velocity m/s is 7.11≤p/v≤10.68, and the laser beam spacing is 3mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109851377A (en) * | 2019-03-18 | 2019-06-07 | 广东朗研科技有限公司 | A kind of induced with laser high temperature solid state reaction generation A2B2O7The method of type heat barrier coat material |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101357854A (en) * | 2008-09-12 | 2009-02-04 | 西安交通大学 | Postprocessing method for reducing thermal conductivity of ceramic heat barrier coating |
| WO2009126194A1 (en) * | 2008-04-11 | 2009-10-15 | Siemens Energy, Inc. | Segmented thermal barrier coating |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009126194A1 (en) * | 2008-04-11 | 2009-10-15 | Siemens Energy, Inc. | Segmented thermal barrier coating |
| CN101357854A (en) * | 2008-09-12 | 2009-02-04 | 西安交通大学 | Postprocessing method for reducing thermal conductivity of ceramic heat barrier coating |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109851377A (en) * | 2019-03-18 | 2019-06-07 | 广东朗研科技有限公司 | A kind of induced with laser high temperature solid state reaction generation A2B2O7The method of type heat barrier coat material |
| CN109851377B (en) * | 2019-03-18 | 2021-08-27 | 广东朗研科技有限公司 | Laser-induced high-temperature solid-phase reaction for generating A2B2O7Method for forming thermal barrier coating material |
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Application publication date: 20130306 |