CN114672859A - 一种可作为热障涂层粘结层的铂改性铝化物涂层及其制备工艺 - Google Patents
一种可作为热障涂层粘结层的铂改性铝化物涂层及其制备工艺 Download PDFInfo
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 title claims abstract description 143
- 239000011248 coating agent Substances 0.000 title claims abstract description 82
- 238000000576 coating method Methods 0.000 title claims abstract description 82
- 229910052697 platinum Inorganic materials 0.000 title claims abstract description 76
- 239000012720 thermal barrier coating Substances 0.000 title claims abstract description 36
- 229910000951 Aluminide Inorganic materials 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 238000009713 electroplating Methods 0.000 claims abstract description 28
- 238000005229 chemical vapour deposition Methods 0.000 claims abstract description 26
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 21
- 238000000151 deposition Methods 0.000 claims abstract description 18
- 239000000758 substrate Substances 0.000 claims abstract description 9
- 229910052735 hafnium Inorganic materials 0.000 claims abstract description 5
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 5
- 238000007747 plating Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 238000005137 deposition process Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 8
- 230000003647 oxidation Effects 0.000 abstract description 15
- 238000007254 oxidation reaction Methods 0.000 abstract description 15
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 3
- 238000009792 diffusion process Methods 0.000 abstract description 3
- 239000011253 protective coating Substances 0.000 abstract description 3
- 229910000943 NiAl Inorganic materials 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000000956 alloy Substances 0.000 description 19
- 229910045601 alloy Inorganic materials 0.000 description 18
- 238000005269 aluminizing Methods 0.000 description 17
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 15
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 7
- 230000008021 deposition Effects 0.000 description 7
- 238000005488 sandblasting Methods 0.000 description 6
- 229910000838 Al alloy Inorganic materials 0.000 description 5
- QRRWWGNBSQSBAM-UHFFFAOYSA-N alumane;chromium Chemical compound [AlH3].[Cr] QRRWWGNBSQSBAM-UHFFFAOYSA-N 0.000 description 5
- QZPSXPBJTPJTSZ-UHFFFAOYSA-N aqua regia Chemical compound Cl.O[N+]([O-])=O QZPSXPBJTPJTSZ-UHFFFAOYSA-N 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 5
- 239000012153 distilled water Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 239000000725 suspension Substances 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 235000019270 ammonium chloride Nutrition 0.000 description 4
- 238000005422 blasting Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000005498 polishing Methods 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 238000005019 vapor deposition process Methods 0.000 description 4
- 239000013543 active substance Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000002149 energy-dispersive X-ray emission spectroscopy Methods 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 229910000601 superalloy Inorganic materials 0.000 description 3
- 230000003213 activating effect Effects 0.000 description 2
- GIGQFSYNIXPBCE-UHFFFAOYSA-N alumane;platinum Chemical compound [AlH3].[Pt] GIGQFSYNIXPBCE-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 229910052702 rhenium Inorganic materials 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052715 tantalum Inorganic materials 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 229910001011 CMSX-4 Inorganic materials 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- JYDBGJYYVQRPTE-UHFFFAOYSA-L P(=O)(O)([O-])[O-].[Pt+2] Chemical compound P(=O)(O)([O-])[O-].[Pt+2] JYDBGJYYVQRPTE-UHFFFAOYSA-L 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-L Phosphate ion(2-) Chemical compound OP([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-L 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011863 silicon-based powder Substances 0.000 description 1
- AGGKEGLBGGJEBZ-UHFFFAOYSA-N tetramethylenedisulfotetramine Chemical compound C1N(S2(=O)=O)CN3S(=O)(=O)N1CN2C3 AGGKEGLBGGJEBZ-UHFFFAOYSA-N 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 230000004584 weight gain Effects 0.000 description 1
- 235000019786 weight gain Nutrition 0.000 description 1
- DUNKXUFBGCUVQW-UHFFFAOYSA-J zirconium tetrachloride Chemical compound Cl[Zr](Cl)(Cl)Cl DUNKXUFBGCUVQW-UHFFFAOYSA-J 0.000 description 1
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/50—Electroplating: Baths therefor from solutions of platinum group metals
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/06—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of metallic material
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Abstract
本发明公开了一种可作为热障涂层粘结层的铂改性铝化物涂层及其制备工艺,属于高温防护涂层技术领域。首先在基体上使用碱性电镀溶液沉积铂以形成镀铂层,然后通过CVD在镀铂层上沉积Al元素,最终获得可作为热障涂层粘结层的铂改性铝化物涂层;该涂层主体为β‑(Ni,Pt)Al涂层,涂层中Al含量为16~30wt%,Pt含量为10‑40wt%。本发明铝化物扩散涂层中主相为β‑(Ni,Pt)Al相,Pt存在于β‑NiAl相中,由于电镀溶液为碱性,涂层不含S、Cl等有害元素,并可通过CVD添加Zr、Hf、Si等元素中的一种或两种,提高了铂铝粘结层的高温氧化和热腐蚀寿命,改善高温下TBC的抗热循环氧化寿命。
Description
技术领域
本发明涉及高温防护涂层技术领域,具体涉及一种可作为热障涂层粘结层的铂改性铝化物涂层及其制备工艺。
背景技术
随着航空发动机及燃气轮机设计技术不断进步,功率、效率和功率密度等性能参数不断提高,提高涡轮前燃气温度是提高发动机热机效率和功率的根本所在。
为满足航空发动机及燃气轮机更新换代的升级需求,一方面需要采用高效的冷却技术,另一方面必须采用耐温等级更高的合金材料。根据叶片使用温度的要求,燃气轮机高压涡轮动叶选取了DD5单晶合金(使用温度1100℃以下)。在上述基础上,通过在叶片表面制备先进热障涂层(TBCs)降低实际工作温度也成为提高叶片耐温能力的有效手段之一。
相关应用的文献如:①中国发明专利:Pt+Si改性的β-NiAl热障涂层及其制备方法,申请号201210078703.7;②中国发明专利:用于隔热涂层的经铂改性的NiCoCrAlY结合涂层,申请号200610169095.5;③中国发明专利:一种防护涂层,申请号200410003852.2等。
针对单晶高温合金,本发明通过对不同预氧化制度下的铂铝涂层抗高温氧化及热腐蚀性能进行表征及影响规律分析,进一步研发出优化的TBCs单相Pt-Al粘结层工艺,以期延长TBCs热障涂层的服役时间。
发明内容
为了延长TBCs热障涂层的服役时间,本发明的目的在于提供一种可作为热障涂层粘结层的铂改性铝化物涂层及其制备工艺。本发明涂层中仅含有稳定的β-(Ni,Pt)Al单相组织,在保证涂层热稳定性的同时提供了足够含量的铝和铂元素。因此可以防止由于相变体积变化导致的涂层表面褶皱,提高TBCs热障的涂层的使用寿命。
为了实现上述目的,本发明所采用的技术方案如下:
一种可作为热障涂层粘结层的铂改性铝化物涂层,该涂层为β-(Ni,Pt)Al单相涂层,Pt、Al和Ni元素在β-(Ni,Pt)Al相中均匀分布,其中:Al元素含量为16-30wt%,Pt元素含量为10-40wt%。
所述可作为热障涂层粘结层的铂改性铝化物涂层制备过程为:首先在基体上沉积铂元素以形成镀铂层,扩散后通过化学气相沉积(CVD)在所述镀铂基底上沉积Al元素,并可通过CVD同时添加Zr、Hf、Si等元素,最终获得可作为热障涂层粘结层的铂改性铝化物涂层;具体包括如下步骤:
(1)通过电镀将Pt沉积在基体上形成镀铂层;所述镀铂层的厚度为1-8μm。
(2)通过热处理将镀铂层中Pt元素扩散到基体当中。
(3)通过化学气相沉积(CVD)在镀铂层上面沉积Al元素形成含有β-(Ni,Pt)Al单相的改性铝化物涂层。
步骤(1)中,所述电镀工艺采用的镀液组成为:铂含量为5-25g/L的磷酸氢四氨合铂,1-20g/L的磷酸氢二钠,其余为水;镀液pH值为9-11,镀液温度为70-95℃,电镀电流密度为1-10A/dm2,电镀时间为10分钟到3小时。
步骤(2);所述热处理温度为1000-1140℃,热处理时间为1-5小时。
步骤(3)中,铝元素的沉积采用化学气相沉积(CVD)。铝元素的沉积过程中,温度900-1100℃,时间3-6小时;沉积之后形成含有β-(Ni,Pt)Al单相的涂层。
该铂改性铝化物涂层中还可含有Hf元素或Zr元素或Si元素,Hf元素含量为0.1~2wt%,Zr元素含量为0.1~2wt%,Si元素含量为0.1~6wt%;通过CVD沉积相应元素,形成Hf、Zr或Si改性的β-(Ni,Pt)Al单相涂层。
本发明可作为热障涂层粘结层的铂改性铝化物涂层与传统的铂铝涂层相比具有以下优点:
1.本发明通过电镀与扩散渗铝结合的方法,制备可作为热障涂层粘结层的铂改性铝化物涂层,电镀配方当中不含有S、Cl等影响涂层高温氧化及腐蚀的有害元素,提高了TBCs涂层的高温寿命。
2.本发明涂层铝含量较低,涂层热处理工艺合理,不影响基体力学性能。
3.本发明β-(Ni,Pt)Al粘结层高温氧化性能良好,表面涂敷YSZ后1100℃热循环寿命可达1100次/小时循环。
4.本发明β-(Ni,Pt)Al粘结层还可含有Hf、Zr和Si中的一种或两种,用作TBC的粘结涂层具有比MCrAlY及传统铂铝粘结层更为优异的服役寿命。
附图说明
图1实施例1中渗铝之后样品的XRD图谱分析。
图2是实施例2中铂改性铝化物涂层的扫描图谱、元素含量检测位置及元素含量。
图3是实施例3中铂改性铝化物涂层1100℃恒温氧化曲线。
图4是实施例1中涂敷YSZ顶层的铂改性铝化物扫描图谱。
图5是实施例3中涂敷顶层YSZ涂层的铂改性铝化物涂层1100℃保温5分钟炉冷5分钟测试热冲击1500次试样外观。
图6是实施例4中Zr改性β-(Ni,Pt)Al表面EDS线扫描图谱。
图7是实施例4中PtZrAl涂层与PtAl涂层在1100℃恒温氧化动力学曲线。
图8是实施例5中PtSiAl涂层的截面EDS线扫描图谱。
图9是实施例5中PtSiAl涂层与PtAl涂层在1100℃恒温氧化动力学曲线。
具体实施方式
为了进一步理解本发明,以下结合实例对本发明进行描述,但实例仅为对本发明的特点和优点做进一步阐述,而不是对本发明权利要求的限制。
实施例1:
本实施例基材采用单晶镍基高温合金DD5(Rene5),其化学成分如下(质量百分比):Co:7.5%,Cr:7%,W:5%,Mo:1.5%,Al:6.2%,Ta:6.5%,Re:3%,Ni:余量。
将直径为30毫米的高温合金棒用线切割加工成厚5毫米的圆片,在圆片的上方正中间位置切Φ3mm的圆孔,以方便电镀和气相沉积的过程中悬挂。
电镀溶液组成为:磷酸氢根四氨合铂15g/L(按电镀液中铂浓度计算),磷酸氢二钠10g/L,其余为水。
高温合金样品磨抛后在压力为0.3MPa的喷砂机中喷砂。然后将样品超声清洗后吹干备用。然后该样品浸入到王水溶液中30秒,然后浸入到蒸馏水中。
制得的样品接下来立即电镀。条件如下:
电流密度=1A/dm2;
温度=95℃;
pH=11;
沉积时间=60分钟;
电镀铂层厚度为5微米。
渗铝采用化学气相沉积,采用的渗铝源为铬铝合金粉,无惰性剂,活性剂为氯化铵,在真空状态下渗铝5小时,温度为1050℃,升温速率为6℃/min。渗铝后所得涂层的截面图如图5所示,由EDS分析得出,涂层厚度为33微米,涂层内的平均铂含量为28wt.%,XRD结果分析涂层内部组织为β-(Ni,Pt)Al单相组织(图1)。
图4为制备YSZ顶层的铂改性铝化物扫描图谱。
实施例2:
基体合金采用与实施例1相同的DD5(Rene5)高温合金,将直径为13毫米的高温合金棒用线切割加工成厚2毫米的圆片,在圆片的上方正中间位置切Φ3mm的圆孔,以方便电镀和气相沉积的过程中悬挂。
电镀溶液组成为:磷酸氢根四氨合铂10g/L(按电镀液中铂浓度计算),磷酸氢二钠8g/L,其余为水。
高温合金样品磨抛后在压力为0.3MPa的喷砂机中喷砂。然后将样品超声清洗后吹干备用。然后该样品浸入到王水溶液中30秒,然后浸入到蒸馏水中。
制得的样品接下来立即电镀。条件如下:
电流密度=2A/dm2;
温度=90℃;
pH=10;
沉积时间=40分钟;
电镀铂层厚度为4微米。
渗铝采用化学气相沉积,采用的渗铝源为铬铝合金粉,无惰性剂,活性剂为氯化铵,在真空状态下渗铝5小时,温度为1090℃,升温速率为6℃/min。渗铝后所得涂层的截面图如图5所示,由EDS分析得出,涂层厚度为40微米,涂层内的平均铂含量为19wt.%(图2)。
实施例3:
基体合金采用DD419(CMSX-4)高温合金,其化学成分如下(质量百分比):Co:9.6%,Cr:6.46%,W:6.34%,Mo:0.6%,Al:5.46%,Ti:1.01%,Ta:6.49%,Re:2.9%,Ni:余量。
将直径为13毫米的高温合金棒用线切割加工成厚2毫米的圆片,在圆片的上方正中间位置切Φ3mm的圆孔,以方便电镀和气相沉积的过程中悬挂。
电镀溶液组成为:磷酸氢根四氨合铂3g/L(按电镀液中铂浓度计算),磷酸氢二钠5g/L,其余为水。
高温合金样品磨抛后在压力为0.3MPa的喷砂机中喷砂。然后将样品超声清洗后吹干备用。然后该样品浸入到王水溶液中30秒,然后浸入到蒸馏水中。
制得的样品接下来立即电镀。条件如下:
电流密度=3A/dm2;
温度=95℃;
pH=11;
沉积时间=60分钟;
电镀铂层厚度为3微米。
渗铝采用化学气相沉积,采用的渗铝源为铬铝合金粉,无惰性剂,活性剂为氯化铵,在真空状态下渗铝4小时,温度为1100℃,升温速率为6℃/min。
图3是本实施例中铂改性铝化物涂层1100℃恒温氧化曲线,1100℃恒温氧化1000小时后涂层氧化增重不超过0.35mg/cm2,表现出优异的抗高温氧化性能。
图5是本实施例中涂敷顶层YSZ涂层的铂改性铝化物涂层1100℃保温5分钟炉冷5分钟测试热冲击1500次试样外观,YSZ涂层无明显剥落,显示出TBCs涂层优异的抗热冲击性能。
实施例4:
基体合金采用与实施例1相同的DD5(Rene5)高温合金,将直径为13毫米的高温合金棒用线切割加工成厚2毫米的圆片,在圆片的上方正中间位置切Φ3mm的圆孔,以方便电镀和气相沉积的过程中悬挂。
电镀溶液组成为:磷酸氢根四氨合铂8g/L(按电镀液中铂浓度计算),磷酸氢二钠8g/L,其余为水。
高温合金样品磨抛后在压力为0.3MPa的喷砂机中喷砂。然后将样品超声清洗后吹干备用。然后该样品浸入到王水溶液中30秒,然后浸入到蒸馏水中。
制得的样品接下来立即电镀。条件如下:
电流密度=2A/dm2;
温度=90℃;
pH=10;
沉积时间=40分钟;
电镀铂层厚度为3微米。
渗铝采用化学气相沉积,采用的渗铝源为铬铝合金粉,无惰性剂,活性剂为氯化氢及氯化锆,在真空状态下渗铝4小时,温度为1085℃,升温速率为6℃/min。渗铝后所得涂层的表面形貌如图6所示,由EDS分析得出,涂层当中含有白色的富Zr相,PtZrAl涂层在1100℃的恒温氧化性能优于PtAl涂层(图7)。
实施例5:
基体合金采用与实施例1相同的DD5(Rene5)高温合金,将直径为13毫米的高温合金棒用线切割加工成厚2毫米的圆片,在圆片的上方正中间位置切Φ3mm的圆孔,以方便电镀和气相沉积的过程中悬挂。
电镀溶液组成为:磷酸氢根四氨合铂2g/L(按电镀液中铂浓度计算),磷酸氢二钠8g/L,其余为水。
高温合金样品磨抛后在压力为0.3MPa的喷砂机中喷砂。然后将样品超声清洗后吹干备用。然后该样品浸入到王水溶液中30秒,然后浸入到蒸馏水中。
制得的样品接下来立即电镀。条件如下:
电流密度=2A/dm2;
温度=90℃;
pH=10;
沉积时间=80分钟;
电镀铂层厚度为4微米。
渗铝采用化学气相沉积,采用的渗铝源为铬铝合金粉和硅粉,无惰性剂,活性剂为氯化铵,在真空状态下渗铝5小时,温度为1090℃,升温速率为6℃/min。渗铝后所得涂层的截面图如图8所示,由EDS分析得出,Si主要富集在涂层外层及互扩散区,PtSiAl涂层在1100℃的恒温氧化性能优于PtAl涂层(图9)。
Claims (10)
1.一种可作为热障涂层粘结层的铂改性铝化物涂层,其特征在于:该铂改性铝化物涂层为β-(Ni,Pt)Al单相涂层,涂层厚度为10~70微米,涂层中Al元素含量为16-30wt%,Pt元素含量为10-40wt%,Ni为余量。
2.根据权利要求1所述的可作为热障涂层粘结层的铂改性铝化物涂层,其特征在于:该铂改性铝化物涂层中还含有Hf元素、Zr元素和Si元素中的一种或两种,Hf元素含量为0.1~2wt%,Zr元素含量为0.1~2wt%,Si元素含量为0.1~6wt%。
3.根据权利要求1所述的可作为热障涂层粘结层的铂改性铝化物涂层的制备工艺,其特征在于:该工艺首先在基体上使用碱性电镀溶液沉积铂元素以形成镀铂层,然后通过化学气相沉积(CVD)在具有镀铂层的基底上沉积Al元素,最终获得可作为热障涂层粘结层的铂改性铝化物涂层;该工艺具体包括如下步骤:
(1)通过电镀将Pt沉积在基体上形成镀铂层;
(2)通过热处理使镀铂层中Pt元素扩散到基体当中;
(3)通过化学气相沉积(CVD)在镀铂层上面沉积Al元素形成β-(Ni,Pt)Al单相涂层。
4.根据权利要求3所述的可作为热障涂层粘结层的铂改性铝化物涂层的制备工艺,其特征在于:步骤(1)中,所述电镀工艺采用的镀液组成为:5-25g/L的磷酸氢根四氨合铂(按铂含量计算的浓度),1-20g/L的磷酸氢二钠,其余为水;镀液pH值为9-11,镀液温度为70-95℃;电镀电流密度为1-10A/dm2,电镀时间为10分钟到3小时。
5.根据权利要求3所述的可作为热障涂层粘结层的铂改性铝化物涂层的制备工艺,其特征在于:步骤(1)中,所述镀铂层的厚度为1-8μm。
6.根据权利要求3所述的可作为热障涂层粘结层的铂改性铝化物涂层的制备工艺,其特征在于:步骤(2)中,所述热处理温度为1000-1140℃,热处理时间为1-5小时。
7.根据权利要求3所述的可作为热障涂层粘结层的铂改性铝化物涂层的制备工艺,其特征在于:步骤(3)中,采用化学气相沉积(CVD)在镀铂层上同时沉积Al及Hf元素,形成Hf改性β-(Ni,Pt)Al单相涂层,该涂层中Hf含量为0.1~2wt%。
8.根据权利要求3所述的可作为热障涂层粘结层的铂改性铝化物涂层的制备工艺,其特征在于:步骤(3)中,采用化学气相沉积(CVD)在镀铂层上同时沉积Al及Zr元素,形成Zr改性β-(Ni,Pt)Al单相涂层,该涂层中Zr含量为0.1~2wt%。
9.根据权利要求2所述的可作为热障涂层粘结层的铂改性铝化物涂层的制备工艺,其特征在于:步骤(3)中,采用化学气相沉积(CVD)在镀铂层上同时沉积Al及Si元素,形成Si改性β-(Ni,Pt)Al单相涂层,该涂层中Si含量为0.1~6wt%。
10.根据权利要求3、7-9中任一所述的可作为热障涂层粘结层的铂改性铝化物涂层的制备工艺,其特征在于:步骤(3)沉积过程中,温度900-1100℃,时间3-6小时。
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