CN103706784A - Agglomerated composite powder for high-temperature abradable seal coating and preparation method thereof - Google Patents
Agglomerated composite powder for high-temperature abradable seal coating and preparation method thereof Download PDFInfo
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- CN103706784A CN103706784A CN201410000653.XA CN201410000653A CN103706784A CN 103706784 A CN103706784 A CN 103706784A CN 201410000653 A CN201410000653 A CN 201410000653A CN 103706784 A CN103706784 A CN 103706784A
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Abstract
The invention relates to agglomerated composite powder for a thermal spraying high-temperature abradable seal coating and a preparation method thereof. The agglomerated composite powder with good spraying process adaptability is prepared by the methods of mechanical ball milling, room temperature bonding and agglomeration. The powder contains MCrAlY alloy powder, alloy powder taking beta-NiAl intermetallic compound as main phase, polyphenyl ester powder, boron nitride, binder and other substances. The raw material can be a combination of the materials, and the binder can be an inorganic substance or an organic substance. The powder contains beta-NiAl intermetallic compound high-temperature resistant components, can improve the heat-resistant temperature of the existing metal-based sealing coating, has excellent thermal shock resistance compared with a ceramic sealing coating, and can be used under the working condition of high temperature of 1000 ℃ for a long time. The powder has wide application in the gas path sealing of high-temperature parts of gas turbines, particularly high-pressure turbine parts.
Description
Technical field
The present invention relates to thermal spraying material field, particularly Conglobation type composite powder and preparation method thereof and preparation method thereof for a kind of high-temperature abradable seal coating.
Background technology
In order to improve the efficiency of gas turbine, reduce oil consumption, the gas circuit technology of obturaging is important means.Abradable seal coating, as a kind of important gas circuit technology of obturaging, is widely applied in gas turbine.There have been at present nearly 20 kinds of abradable seal coating materials, medium and low temperature section at gas turbine, existing abradable seal coating material can meet instructions for use, but the high temperature position at gas turbine, high-pressure turbine position particularly, operating temperature meets or exceeds 1000 ℃, due to the bad working environments environment of HTHP, coating can lose efficacy rapidly because of reasons such as burn into oxidation and heat fatigues, cannot meet the instructions for use of advanced gas turbine.
Existing sealing coating material is by the framework material that coating and substrate combinating strength is provided, keeps coating structure integrality and the performances such as coating erosion wear resistance, non-oxidizability, corrosion resistance are provided, with the filling phase material composition that coating abradability, antifriction lubricity are provided, framework material mainly contains metal simple-substance and the alloys thereof such as aluminium, copper, titanium, nickel, chromium, fills phase material and mainly contains polyester plastics, graphite, hexagonal boron nitride etc.The high temperature sealing coating material that is applied at present gas turbine mainly contains NiCrAl/ bentonite, NiCrAl/ diatomite, NiCrFeAl/hBN, CoNiCrAlY/hBN etc., this type coating material is because its framework material high temperature oxidation resistance is not enough, the maximum operation (service) temperature of prepared coating, lower than 850 ℃, cannot meet the instructions for use of 1000 ℃ of left and right, high-pressure turbine position.
In addition, the high-temperature abrasive sealing coating material of the used for plasma spraying of publication number CN101659800B, adopt the ceramic seal coating of the preparations such as zirconia ceramics powder and polybenzoate, although heat resisting temperature can reach more than 1000 ℃, but because the thermal matching of ceramic coating and gas turbine high temperature alloy substrate is poor, the thermal fatigue resistance of coating is not enough, after experience short-term cold cycling, comes off, and cannot meet requirement in service life.
Summary of the invention
The object of the invention is in order to overcome the deficiencies in the prior art, and high temperature sealing coating material that a kind of heat-resistant anti-fatigue performance is good and preparation method thereof is provided.
The object of the invention is to be achieved through the following technical solutions:
High-temperature abradable seal coating Conglobation type composite powder, by structural constituent, can wear away component and bonding agent and reunite and form, it is characterized in that, described structural constituent is the mixture of β-NiAl intermetallic compound or β-NiAl intermetallic compound and MCrAlY alloy powder (M is one or more in metallic element Fe, Co, Ni), describedly wear away the mixture that component is polyester powder or polyester powder and hexagonal boron nitride powder, weight of binder accounts for 1～10% of raw material weight, can wear away composition weight and account for 5～30% of raw material weight, structural constituent is surplus.
In some embodiments, described bonding agent is any organic adhesive being selected from polyvinylpyrrolidone, the first and second glue, alkyd varnish, or for being selected from any inorganic adhesive in waterglass, aluminium dihydrogen phosphate.
In some embodiments, described polyester powder is polybenzoate or polyamide.
In some embodiments, when described structural constituent is the mixture of β-NiAl intermetallic compound and MCrAlY alloy powder, the weight ratio of β-NiAl intermetallic compound and MCrAlY alloy powder is 1～10: 1.
In some embodiments, described when wearing away component and being the mixture of polyester powder and hexagonal boron nitride powder, the weight ratio of polyester powder and hexagonal boron nitride powder is 1～10: 1.
The present invention also provides the preparation method of high-temperature abradable seal coating with Conglobation type composite powder, said method comprising the steps of:
(1) by structural constituent and can wear away the full and uniform mixing of component;
(2) by the structural constituent mixing and can wear away component, when stirring, add binding agent, proceed to be stirred to powder granulating;
(3) at 50～150 ℃, keep drying for 1～5 hour, screening is processed, and makes finished product.
In some embodiments, in step (2), be stirred to after powder granulating, powder is tentatively sieved, then keep drying for 1～5 hour at 50～150 ℃.
In some embodiments, described binding agent is first dispersed in solvent before adding, and then jointly joins in mixed-powder with solvent.
In some embodiments, described binding agent is disposablely to add or add several times, intermittently adds or adds continuously.
The present invention contrasts prior art and has following innovative point:
1, in powdery components, add and take the alloy powder that β-NiAl is principal phase;
2, adopt mechanical agglomeration to prepare composite powder.
The present invention contrasts prior art and has following remarkable advantage:
1, take the high temperature oxidation resistance that has significantly improved material that adds of alloy powder that β-NiAl is principal phase.
2, metallic framework material and high temperature alloy matrix have good thermal matching, have significantly improved the service life of high temperature seal coating.
3, with agglomeration process, prepare composite powder, significantly improve the structure property uniformity with the coating of this powder preparation.
The specific embodiment
By the following examples the present invention is described further.
Embodiment 1
Material composition: structural constituent: β-NiAl intermetallic compound; Can wear away component: polybenzoate; Bonding agent: polyvinylpyrrolidone.
Raw material proportioning: can wear away component 5wt%, bonding agent 1wt%, structural constituent surplus.
Preparation method: utilize ball milling to mix more than 12 hours with wearing away component structural constituent, after component mixes, powder is taken out stand-by.Then add while stirring binding agent.During stirring, using length is " word " type paddle of 30～50cm, uses the flat agitator tank that internal diameter is 40～80cm, and material thickness must not surpass 1/3rd of agitator tank internal diameter height, and rotating speed of agitator is 60～150r/min.Binding agent is disposable to add.Continue material to stir, until material powder is reunited for particle, use 30 eye mesh screens to sieve the powder of granulating, oversize again drops into agitator tank and stirs, until all powder can pass through screen cloth.Powder after screening is laid in pallet, in baking oven, with 50～80 ℃, dries 2 hours, the powder after oven dry is used 30 eye mesh screen screenings, makes finished product.
Embodiment 2
Material composition: structural constituent: the mixture of β-NiAl intermetallic compound and MCrAlY alloy powder, the weight ratio of β-NiAl intermetallic compound and MCrAlY alloy powder is 1: 1; Can wear away component: the mixture of polyamide and hexagonal boron nitride, the weight ratio of polyamide and hexagonal boron nitride is 10: 1; Bonding agent: the first and second glue.
Raw material proportioning: can wear away component 10wt%, bonding agent 2wt%, structural constituent surplus.
Preparation method: by structural constituent with can wear away component mechanical agitation and mix more than 12 hours, after component mixes, powder is taken out stand-by.Binding agent.During stirring, using length is " word " type paddle of 30～50cm, uses the flat agitator tank that internal diameter is 40～80cm, and material thickness must not surpass 1/3rd of agitator tank internal diameter height, and rotating speed of agitator is 60～150r/min.Binding agent is disposable to add.Continue material to stir, until material powder is reunited for particle, in baking oven, with 50～80 ℃, dry 2 hours, the powder after oven dry is used 30 eye mesh screen screenings, makes finished product.
Embodiment 3
Material composition: structural constituent: the mixture of β-NiAl intermetallic compound and MCrAlY alloy powder, the weight ratio of β-NiAl intermetallic compound and MCrAlY alloy powder is 3: 1; Can wear away component: the mixture of polyamide and hexagonal boron nitride, the weight ratio of polyamide and hexagonal boron nitride is 3: 1; Bonding agent: alkyd varnish.
Raw material proportioning: can wear away component 15wt%, bonding agent 3wt%, structural constituent surplus.
Preparation method: utilize ball milling to mix more than 12 hours with wearing away component structural constituent, after component mixes, powder is taken out stand-by.Binding agent.During stirring, using length is " word " type paddle of 30～50cm, uses the flat agitator tank that internal diameter is 40～80cm, and material thickness must not surpass 1/3rd of agitator tank internal diameter height, and rotating speed of agitator is 60～150r/min.Binding agent adds at twice, is incorporated as first 30～50% of whole binding agents, adds remaining binding agent after the binding agent adding for the first time mixes with powder again.Continue material to stir, until material powder is reunited for particle, use 30 eye mesh screens to sieve the powder of granulating, oversize again drops into agitator tank and stirs, until all powder can pass through screen cloth.Powder after screening is laid in pallet, in baking oven, with 50～80 ℃, dries 2 hours, the powder after oven dry is used 30 eye mesh screen screenings, makes finished product.
Embodiment 4
Material composition: structural constituent: the mixture of β-NiAl intermetallic compound and MCrAlY alloy powder, the weight ratio of β-NiAl intermetallic compound and MCrAlY alloy powder is 5: 1; Can wear away component: polybenzoate; Bonding agent: waterglass.
Raw material proportioning: can wear away component 20wt%, bonding agent 5wt%, structural constituent surplus.
Preparation method: utilize ball milling to mix more than 12 hours with wearing away component structural constituent, after component mixes, powder is taken out stand-by.Binding agent.During stirring, using length is " word " type paddle of 30～50cm, uses the flat agitator tank that internal diameter is 40～80cm, and material thickness must not surpass 1/3rd of agitator tank internal diameter height, and rotating speed of agitator is 60～150r/min.Binding agent adds at twice, is incorporated as first 30～50% of whole binding agents, adds remaining binding agent after the binding agent adding for the first time mixes with powder again.Continue material to stir, until material powder is reunited for particle, use 30 eye mesh screens to sieve the powder of granulating, oversize again drops into agitator tank and stirs, until all powder can pass through screen cloth.Powder after screening is laid in pallet, in baking oven, with 80～150 ℃, dries 2 hours, the powder after oven dry is used 30 eye mesh screen screenings, makes finished product.
Embodiment 5
Material composition: structural constituent: the mixture of β-NiAl intermetallic compound and MCrAlY alloy powder, the weight ratio of β-NiAl intermetallic compound and MCrAlY alloy powder is 10: 1; Can wear away component: the mixture of polybenzoate and hexagonal boron nitride, the weight ratio of polybenzoate and hexagonal boron nitride is 5: 1; Bonding agent: aluminium dihydrogen phosphate.
Raw material proportioning: can wear away component 30wt%, bonding agent 10wt%, structural constituent surplus.
Preparation method: utilize ball milling to mix more than 12 hours with wearing away component structural constituent, after component mixes, powder is taken out stand-by.Binding agent.During stirring, using length is " word " type paddle of 30～50cm, uses the flat agitator tank that internal diameter is 40～80cm, and material thickness must not surpass 1/3rd of agitator tank internal diameter height, and rotating speed of agitator is 60～150r/min.Binding agent adds at twice, is incorporated as first 30～50% of whole binding agents, adds remaining binding agent after the binding agent adding for the first time mixes with powder again.Continue material to stir, until material powder is reunited for particle, use 30 eye mesh screens to sieve the powder of granulating, oversize again drops into agitator tank and stirs, until all powder can pass through screen cloth.Powder after screening is laid in pallet, in baking oven, with 80～150 ℃, dries 2 hours, the powder after oven dry is used 30 eye mesh screen screenings, makes finished product.
Claims (9)
1. high-temperature abradable seal coating Conglobation type composite powder, by structural constituent, can wear away component and bonding agent and reunite and form, it is characterized in that, described structural constituent is the mixture of β-NiAl intermetallic compound or β-NiAl intermetallic compound and MCrAlY alloy powder, describedly wear away the mixture that component is polyester powder or polyester powder and hexagonal boron nitride powder, weight of binder accounts for 1～10% of raw material weight, can wear away composition weight and account for 5～30% of raw material weight, structural constituent is surplus.
2. high-temperature abradable seal coating according to claim 1 Conglobation type composite powder, it is characterized in that, described bonding agent is any organic adhesive being selected from polyvinylpyrrolidone, the first and second glue, alkyd varnish, or for being selected from any inorganic adhesive in waterglass, aluminium dihydrogen phosphate.
3. high-temperature abradable seal coating according to claim 1 Conglobation type composite powder, is characterized in that, described polyester powder is polybenzoate or polyamide.
4. high-temperature abradable seal coating according to claim 1 Conglobation type composite powder, it is characterized in that, when described structural constituent is the mixture of β-NiAl intermetallic compound and MCrAlY alloy powder, the weight ratio of β-NiAl intermetallic compound and MCrAlY alloy powder is 1～10: 1.
5. high-temperature abradable seal coating according to claim 1 Conglobation type composite powder, it is characterized in that, described when wearing away component and being the mixture of polyester powder and hexagonal boron nitride powder, the weight ratio of polyester powder and hexagonal boron nitride powder is 1～10: 1.
6. the preparation method with Conglobation type composite powder according to the high-temperature abradable seal coating described in the arbitrary claim of claim 1-5, is characterized in that, said method comprising the steps of:
(1) by structural constituent and can wear away the full and uniform mixing of component;
(2) by the structural constituent mixing and can wear away component, when stirring, add binding agent, proceed to be stirred to powder granulating;
(3) at 50～150 ℃, keep drying for 1～5 hour, screening is processed, and makes finished product.
7. preparation method according to claim 6, is characterized in that, in step (2), is stirred to after powder granulating, powder is tentatively sieved, then keep drying for 1～5 hour at 50～150 ℃.
8. preparation method according to claim 6, is characterized in that, described binding agent is first dispersed in solvent before adding, and then jointly joins in mixed-powder with solvent.
9. preparation method according to claim 6, is characterized in that, described binding agent is disposablely to add or add several times, intermittently adds or adds continuously.
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Cited By (6)
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| CN104357792A (en) * | 2014-11-14 | 2015-02-18 | 北京矿冶研究总院 | Titanium alloy high-temperature oxidation-resistant fretting wear-resistant coating material, coating and preparation method |
| CN108213450A (en) * | 2018-03-14 | 2018-06-29 | 北京矿冶科技集团有限公司 | Aluminium base seal coating Conglobation type composite powder and preparation method |
| CN108642435A (en) * | 2018-08-07 | 2018-10-12 | 广东省新材料研究所 | A kind of big thickness high-temperature protection coating of turbine outer ring inner wall and preparation method thereof |
| CN110565040A (en) * | 2019-10-16 | 2019-12-13 | 北京矿冶科技集团有限公司 | Composite sealing coating powder with high deposition rate and preparation method thereof |
| CN111496246A (en) * | 2020-05-06 | 2020-08-07 | 北京矿冶科技集团有限公司 | Method for preparing mechanical coating powder by coating slurry, heating and curing |
| CN115870493A (en) * | 2023-03-01 | 2023-03-31 | 矿冶科技集团有限公司 | Low-burning-loss composite powder and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104357792A (en) * | 2014-11-14 | 2015-02-18 | 北京矿冶研究总院 | Titanium alloy high-temperature oxidation-resistant fretting wear-resistant coating material, coating and preparation method |
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| CN108642435A (en) * | 2018-08-07 | 2018-10-12 | 广东省新材料研究所 | A kind of big thickness high-temperature protection coating of turbine outer ring inner wall and preparation method thereof |
| CN110565040A (en) * | 2019-10-16 | 2019-12-13 | 北京矿冶科技集团有限公司 | Composite sealing coating powder with high deposition rate and preparation method thereof |
| CN111496246A (en) * | 2020-05-06 | 2020-08-07 | 北京矿冶科技集团有限公司 | Method for preparing mechanical coating powder by coating slurry, heating and curing |
| CN115870493A (en) * | 2023-03-01 | 2023-03-31 | 矿冶科技集团有限公司 | Low-burning-loss composite powder and preparation method thereof |
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Application publication date: 20140409 |