CN114807823A - 一种燃气轮机热端部件用高温防护涂层制备方法 - Google Patents
一种燃气轮机热端部件用高温防护涂层制备方法 Download PDFInfo
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Abstract
本发明公开了一种燃气轮机热端部件用高温防护涂层制备方法,其特征在于先制备含Ta‑Nb‑Hf‑Zr‑Ti难熔高熵合金的高温防护涂层粉末;然后大气等离子喷涂制备涂层,再采用超音速喷丸处理在表面形成细晶层,利于高温下内部Al元素向外扩散形成防护层;最后在高温下经过真空和氧分压气氛烧结在表面形成致密Al2O3陶瓷氧化膜进一步提高抗氧化性能。
Description
技术领域
本发明涉及一种涂层的制备方法,特别涉及一种燃气轮机热端部件用高温防护涂层制备方法,属于表面工程领域。
背景技术
燃气轮机为了获得较高的效率而采用较高的涡轮进口温度,其热端部件,如如燃烧室、涡轮、尾喷管等需要承受氧化腐蚀及高速气流的冲刷,极易发生失效。目前普遍采用表面制备高温防腐涂层的方法进行防护。
CN110423976A高温抗剥落Y-Al2O3/MCrAlY复合涂层及其制备方法,属于表面工程技术领域。Y-Al2O3/MCrAlY复合涂层,M是Ni、Co或Fe中的一种或几种,涂层具有多层结构,且Al2O3膜中不含有Y2O3及Y-Al-O氧化物。该涂层由Y-Al2O3层和MCrAlY层组成,Y-Al2O3层位于MCrAlY层上表面。Y-Al2O3层中,Y原子占据Al2O3晶格中Al原子位置,涂层结构仍为Al2O3晶型;Y-Al2O3层不含有Y2O3及Y-Al-O氧化物。本发明提供的Y-Al2O3/MCrAlY复合涂层具有结合强度高、耐高温氧化、使用寿命长等特点,可用于防护航空、舰船、电力、冶金等领域高温热端部件。CN114086101A公开了一种抗高温氧化和热腐蚀热障涂层及制备方法,所述热障涂层包括由内至外依次设置在基体合金上的MCrAlY粘结层、Al-Cr共渗层和ZrO2-6~8Y2O3陶瓷层,M=Ni或Co或Ni+Co。其中所述的Al-Cr共渗涂层为在MCrAlY粘结层表面进行Al-Cr共渗,内扩散形成内层富Cr的改性铝化物涂层。本发明的热障涂层与未进行Al-Cr共渗处理的传统热障涂层相比,高温氧化速率明显更低,抗高温氧化和热腐蚀性能更为优异。
随着燃气轮机的发展,对涂层的高温性能要求越来越高,现有涂层的抗氧化性已不足,开发具有优异的高温防护性能的涂层制备技术具有重要的价值。
发明内容
针对目前燃气轮机热端部件用高温防护涂层制备方法存在的问题,本发明提出先制备含Ta-Nb-Hf-Zr-Ti难熔高熵合金的高温防护涂层粉末;大气等离子喷涂制备涂层后采用超音速喷丸处理在表面形成细晶层,利于高温下内部Al元素向外扩散形成防护层;最后在高温下经过真空和氧分压气氛烧结在表面形成致密Al2O3陶瓷氧化膜进一步提高抗氧化性能。
本发明的燃气轮机热端部件用高温防护涂层制备方法,其特征在于依次包含以下步骤:
(1)高温防护涂层粉末制备:采用真空熔炼-雾化法制备Ta-Nb-Hf-Zr-Ti难熔高熵合金粉末, 其成分为按摩尔百分比Ta-Nb-Hf-Zr-Ti=1:1:1:1:1;采用真空熔炼-雾化法制备NiCoCrAlY粉末,其成分为 Cr占20~25wt.%, Al 占5~10wt.%, Y占0.5~1wt.%, Ni占30~35wt.%, Co为余量;NiCoCrAlY和Ta-Nb-Hf-Zr-Ti的平均粒度均为35~45μm;将Ta-Nb-Hf-Zr-Ti难熔高熵合金粉与NiCoCrAlY粉末按比例混合,其中Ta-Nb-Hf-Zr-Ti难熔高熵合金粉在混合粉末中占10~15wt.%,将混合粉末在行星球磨机中混合1~2h制备出高温防护涂层粉末;
(2)高温防护涂层涂层制备:以经过喷砂处理的耐热钢作为基体,以高温防护涂层粉末作为喂料,采用大气等离子喷涂方法制备涂层,功率30kW, 电流600A,喷距80~100mm,Ar流量45L/min,H2流量6~7L/min,喷涂后涂层的厚度为100~180μm;涂层中NiCoCrAlY的物相组成为α-Cr(FCC)固溶体+β-Ni(Co)Al 相(FCC)+γ-Ni(Co)相(FCC),Ta-Nb-Hf-Zr-Ti的物相组成为BCC结构单相;涂层孔隙率2.0~2.5%;
(3)表面细晶层形成:将制备的涂层进行超音速喷丸处理,采用α-Al2O3颗粒,喷射角度为60~90°,气体压力为1.0~1.5MPa,气流速率700~1200m/s,喷射距离20~40mm,喷射时间60~90s,处理后在表面形成厚度20~40μm的表面细晶层,其晶粒尺寸为0.06μm~0.2μm,数量巨大的晶界可作为Al元素向外扩散形成防护层的通道;
(4)表面陶瓷氧化膜高温防护层形成:先将超音速喷丸后的涂层放入烧结炉中,在真空加热到1000~1100℃并保温1~2h,使涂层中NiCoCrAlY中析出Ni3Al相,Ta-Nb-Hf-Zr-Ti中析出TiAl相,涂层孔隙度降低到1.5~2.0%;保温结束后通入氩气和氧气,控制烧结炉气氛中的氧分压,温度不变并保温4~6h然后随炉冷却,涂层孔隙度降低到1.0~1.5%,涂层表面生成2.5~3.5μm厚的致密Al2O3陶瓷氧化膜高温防护层;获得在1000℃保温48h的静态氧化增重≦0.45mg/cm2。
本发明的燃气轮机热端部件用高温防护涂层制备方法,其进一步的特征在于:
(1)高温防护涂层粉末制备时行星球磨机转速为150~250r/min,球罐中不装球,运行时球磨机以1r/min的速度翻转;
(2)高温防护涂层制备时耐热钢表面进行喷砂的气体压力为3~5bar,刚玉砂颗粒的粒度为12~24目,喷砂时间为1~2min;
(3)表面细晶层形成时,先将涂层抛光处理到粗糙度小于5μm;对涂层表面喷丸采用的α-Al2O3颗粒平均粒度为70~90μm;
(4)表面陶瓷氧化膜高温防护层形成时,升温速度为10℃/min,真空度≦2*10-3Pa;充入氩气和氧气后控制氧分压P=0.1~0.5Pa。
本发明的优点在于:(1)引入的Ta-Nb-Hf-Zr-Ti难熔高熵合金具有十分优异的抗高温氧化性能;(2)表面细晶层中存在数量巨大的晶界,在高温工况下,内部的Al元素有更多的向外扩散的通道,这将有助于致密Al2O3膜的形成,从而提高抗氧化性;(3)表面陶瓷氧化膜高温防护层形成过程中析出的Ni3Al和TiAl相在高温下具有优异的抗氧化性等高温性能;(4)表面陶瓷氧化膜是致密Al2O3,可在涂层高温工况下起到防护作用;(5)表面陶瓷氧化膜高温防护层形成过程中高温下发生相变和熔合,涂层孔隙度降低,致密度提高。
附图说明
图1 本发明的燃气轮机热端部件用高温防护涂层制备方法示意图。
具体实施方式
实例1 按以下步骤制备燃气轮机热端部件用高温防护涂层:
(1)采用真空熔炼-雾化法制备Ta-Nb-Hf-Zr-Ti难熔高熵合金粉末, 其成分为按摩尔百分比Ta-Nb-Hf-Zr-Ti=1:1:1:1:1;采用真空熔炼-雾化法制备NiCoCrAlY粉末,其成分为 Cr占20wt.%, Al 占6wt.%, Y占0.6wt.%, Ni占31wt.%, Co为余量;NiCoCrAlY的平均粒度均为36μm,Ta-Nb-Hf-Zr-Ti的平均粒度均为40μm;将Ta-Nb-Hf-Zr-Ti难熔高熵合金粉与NiCoCrAlY粉末按比例混合,其中Ta-Nb-Hf-Zr-Ti难熔高熵合金粉在混合粉末中占11wt.%,将混合粉末在行星球磨机中混合1h,行星球磨机转速为160r/min,球罐中不装球,运行时球磨机以1r/min的速度翻转,制备出高温防护涂层粉末;
(2)高温防护涂层涂层制备:先对耐热钢表面进行喷砂处理,喷砂气体压力为3bar,刚玉砂颗粒的粒度为15目,喷砂时间为1min;以经过喷砂处理的耐热钢作为基体,以高温防护涂层粉末作为喂料,采用大气等离子喷涂方法制备涂层,功率30kW, 电流600A,喷距80mm,Ar流量45L/min,H2流量6L/min,喷涂后涂层的厚度为120μm;涂层中NiCoCrAlY的物相组成为α-Cr(FCC)固溶体+β-Ni(Co)Al 相(FCC)+γ-Ni(Co)相(FCC),Ta-Nb-Hf-Zr-Ti的物相组成为BCC结构单相;涂层孔隙率2.3%;
(3)表面细晶层形成:先将涂层抛光处理到粗糙度3.2μm,然后将制备的涂层进行超音速喷丸处理,采用平均粒度为72μm的α-Al2O3颗粒,喷射角度为60°,气体压力为1.1MPa,气流速率720m/s,喷射距离20mm,喷射时间70s,处理后在表面形成厚度22μm的表面细晶层,其晶粒尺寸为0.1μm,数量巨大的晶界可作为Al元素向外扩散形成防护层的通道;
(4)表面陶瓷氧化膜高温防护层形成:先将超音速喷丸后的涂层放入烧结炉中,升温速度为10℃/min,真空度1.2*10-3Pa,在真空加热到1050℃并保温1h,使涂层中NiCoCrAlY中析出Ni3Al相,Ta-Nb-Hf-Zr-Ti中析出TiAl相,涂层孔隙度降低到1.8%;保温结束后通入氩气和氧气,控制烧结炉气氛中的氧分压P=0.2Pa,温度不变并保温5h然后随炉冷却,涂层孔隙度降低到1.3%,涂层表面生成2.7μm厚的致密Al2O3陶瓷氧化膜高温防护层;获得在1000℃保温48h的静态氧化增重0.43mg/cm2。
实例2 按以下步骤制备燃气轮机热端部件用高温防护涂层:
(1)采用真空熔炼-雾化法制备Ta-Nb-Hf-Zr-Ti难熔高熵合金粉末, 其成分为按摩尔百分比Ta-Nb-Hf-Zr-Ti=1:1:1:1:1;采用真空熔炼-雾化法制备NiCoCrAlY粉末,其成分为 Cr占23wt.%, Al 占8wt.%, Y占0.7wt.%, Ni占34wt.%, Co为余量;NiCoCrAlY的平均粒度均为40μm,Ta-Nb-Hf-Zr-Ti的平均粒度为42μm;将Ta-Nb-Hf-Zr-Ti难熔高熵合金粉与NiCoCrAlY粉末按比例混合,其中Ta-Nb-Hf-Zr-Ti难熔高熵合金粉在混合粉末中占14wt.%,将混合粉末在行星球磨机中混合2h,行星球磨机转速为220r/min,球罐中不装球,运行时球磨机以1r/min的速度翻转,制备出高温防护涂层粉末;
(2)高温防护涂层涂层制备:先对耐热钢表面进行喷砂处理,喷砂气体压力为5bar,刚玉砂颗粒的粒度为20目,喷砂时间为2min;以经过喷砂处理的耐热钢作为基体,以高温防护涂层粉末作为喂料,采用大气等离子喷涂方法制备涂层,功率30kW, 电流600A,喷距90mm,Ar流量45L/min,H2流量7L/min,喷涂后涂层的厚度为170μm;涂层中NiCoCrAlY的物相组成为α-Cr(FCC)固溶体+β-Ni(Co)Al 相(FCC)+γ-Ni(Co)相(FCC),Ta-Nb-Hf-Zr-Ti的物相组成为BCC结构单相;涂层孔隙率2.4%;
(3)表面细晶层形成:先将涂层抛光处理到粗糙度4.2μm,然后将制备的涂层进行超音速喷丸处理,采用平均粒度为85μm的α-Al2O3颗粒,喷射角度为90°,气体压力为1.4MPa,气流速率900m/s,喷射距离30mm,喷射时间80s,处理后在表面形成厚度29μm的表面细晶层,其晶粒尺寸为0.12μm,数量巨大的晶界可作为Al元素向外扩散形成防护层的通道;
(4)表面陶瓷氧化膜高温防护层形成:先将超音速喷丸后的涂层放入烧结炉中,升温速度为10℃/min,真空度≦1.6*10-3Pa,在真空加热到1080℃并保温2h,使涂层中NiCoCrAlY中析出Ni3Al相,Ta-Nb-Hf-Zr-Ti中析出TiAl相,涂层孔隙度降低到1.6%;保温结束后通入氩气和氧气,控制烧结炉气氛中的氧分压P=0.4Pa,温度不变并保温6h然后随炉冷却,涂层孔隙度降低到1.2%,涂层表面生成3.1μm厚的致密Al2O3陶瓷氧化膜高温防护层;获得在1000℃保温48h的静态氧化增重0.41mg/cm2。
Claims (2)
1.一种燃气轮机热端部件用高温防护涂层制备方法,其特征在于依次包含以下步骤:
(1)高温防护涂层粉末制备:采用真空熔炼-雾化法制备Ta-Nb-Hf-Zr-Ti难熔高熵合金粉末, 其成分为按摩尔百分比Ta-Nb-Hf-Zr-Ti=1:1:1:1:1;采用真空熔炼-雾化法制备NiCoCrAlY粉末,其成分为 Cr占20~25wt.%, Al 占5~10wt.%, Y占0.5~1wt.%, Ni占30~35wt.%, Co为余量;NiCoCrAlY和Ta-Nb-Hf-Zr-Ti的平均粒度均为35~45μm;将Ta-Nb-Hf-Zr-Ti难熔高熵合金粉与NiCoCrAlY粉末按比例混合,其中Ta-Nb-Hf-Zr-Ti难熔高熵合金粉在混合粉末中占10~15wt.%,将混合粉末在行星球磨机中混合1~2h制备出高温防护涂层粉末;
(2)高温防护涂层涂层制备:以经过喷砂处理的耐热钢作为基体,以高温防护涂层粉末作为喂料,采用大气等离子喷涂方法制备涂层,功率30kW, 电流600A,喷距80~100mm,Ar流量45L/min,H2流量6~7L/min,喷涂后涂层的厚度为100~180μm;涂层中NiCoCrAlY的物相组成为α-Cr(FCC)固溶体+β-Ni(Co)Al 相(FCC)+γ-Ni(Co)相(FCC),Ta-Nb-Hf-Zr-Ti的物相组成为BCC结构单相;涂层孔隙率2.0~2.5%;
(3)表面细晶层形成:将制备的涂层进行超音速喷丸处理,采用α-Al2O3颗粒,喷射角度为60~90°,气体压力为1.0~1.5MPa,气流速率700~1200m/s,喷射距离20~40mm,喷射时间60~90s,处理后在表面形成厚度20~40μm的表面细晶层,其晶粒尺寸为0.06μm~0.2μm,数量巨大的晶界可作为Al元素向外扩散形成防护层的通道;
(4)表面陶瓷氧化膜高温防护层形成:先将超音速喷丸后的涂层放入烧结炉中,在真空加热到1000~1100℃并保温1~2h,使涂层中NiCoCrAlY中析出Ni3Al相,Ta-Nb-Hf-Zr-Ti中析出TiAl相,涂层孔隙度降低到1.5~2.0%;保温结束后通入氩气和氧气,控制烧结炉气氛中的氧分压,温度不变并保温4~6h然后随炉冷却,涂层孔隙度降低到1.0~1.5%,涂层表面生成2.5~3.5μm厚的致密Al2O3陶瓷氧化膜高温防护层;获得在1000℃保温48h的静态氧化增重≦0.45mg/cm2。
2.根据权利要求1所述的燃气轮机热端部件用高温防护涂层制备方法,其进一步的特征在于:
(1)高温防护涂层粉末制备时行星球磨机转速为150~250r/min,球罐中不装球,运行时球磨机以1r/min的速度翻转;
(2)高温防护涂层制备时耐热钢表面进行喷砂的气体压力为3~5bar,刚玉砂颗粒的粒度为12~24目,喷砂时间为1~2min;
(3)表面细晶层形成时,先将涂层抛光处理到粗糙度小于5μm;对涂层表面喷丸采用的α-Al2O3颗粒平均粒度为70~90μm;
(4)表面陶瓷氧化膜高温防护层形成时,升温速度为10℃/min,真空度≦2*10-3Pa;充入氩气和氧气后控制氧分压P=0.1~0.5Pa。
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