CN110423919B - 一种汽轮机末级叶片水蚀防护涂层及其制备方法 - Google Patents
一种汽轮机末级叶片水蚀防护涂层及其制备方法 Download PDFInfo
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Abstract
一种汽轮机末级叶片水蚀防护涂层,其结构包括金属底层和防水蚀层,所述金属底层为活性燃烧高速燃气喷涂设备制备的NiCrBSi涂层,所述防水蚀层为大气等离子喷涂设备制备的NiCrBSi‑YSZ涂层,所述防水蚀层中YSZ为纳米结构。金属底层作为过渡层起到缓解叶片基材和陶瓷防水蚀层间的膨胀系数不匹配问题,减缓陶瓷防水蚀层在制备及使用过程中因温度变化导致的脱落;其次,金属底层可作为陶瓷防水蚀层的“软底”,可在服役过程中分散水滴对防水蚀层表面的冲击;防水蚀层中添加一定量的过渡层金属粉末,采用大气等离子喷涂工艺制备,喷涂完成后的涂层中金属相填充了原来陶瓷层中的孔隙位置,使得防水蚀层更加致密,耐水蚀性能更加优异。
Description
技术领域
本发明涉及一种抗水蚀防护涂层及其制备方法,尤其涉及深度调峰工况下的汽轮机末级叶片水蚀防护涂层及其制备方法。
背景技术
随着电力工业的不断发展,我国各大电网电力负荷峰谷差逐年增大,各电网均需要增加大型机组的调频能力,这就迫使机组在非设计工况下运行,甚至是只带厂用电运行。汽轮机叶片,特别是大型汽轮机叶片,当汽轮机在低负荷运行时,末几级的工况变化最大,末级叶片所处的运行工况极为复杂。汽轮机每级叶片的工作温度都不相同,第一级叶片所处的温度最高,普通机组为535℃,大机组580℃左右。随后由于蒸汽做功,温度逐步降低,直到末级叶片降到100℃以下。大功率凝汽式汽轮机的末级排汽湿度总是比较大的,一般高达9%~14%,末级叶片周速度在300m/s以上。末级动叶后汽流中携带有大量的水滴,回流的蒸汽携带的水滴冲击在高速旋转的动叶片下半部的出汽边。对某些己长时运行的叶片,在低负荷或高背压时,会产生大范围的回流,甚至达到叶高的2/3以上。对于这类叶片,出汽侧的水蚀就变得非常严重。叶片发生水蚀后,其外观为蜂窝状,严重者使叶片出汽边缘呈现锯齿状,形成很多细小的裂纹。这些部位很容易产生应力集中,抗疲劳强度降低,水蚀发展到一定程度还会改变叶片的振动特性,导致机组发生强烈振动等恶性事故,而且可使级效率下降。
目前关于末级叶片水蚀防护目前修复的方法有:叶片进汽边背弧侧钎焊司太立合金片、激光熔覆技术制备防水蚀涂层等。但随着深度调峰的实施,末级叶片工况越来越恶劣,水蚀区域也从叶片进汽边延伸至叶片出汽边,水蚀范围进一步扩大,水蚀程度加剧、恶化,现有防护办法不适用于深度调峰工况下的末级叶片水蚀防护。随着水蚀范围的进一步扩大,钎焊司太立合金片的长度也增加,在修复过程中热输入量变大,焊接修复过程中引起的收缩变形使叶片的安装精度难以保证。对于目前多项专利中提到的激光熔覆技术制备防水蚀涂层技术,由于激光熔覆过程中激光对熔覆距离的敏感性(厘米级的波动都会影响熔覆层的质量),深度调峰工况下末级叶片的水蚀区域变大,待防护位置间隙狭窄,无法保证熔覆距离,因此该种工艺也有非常大的局限性,操作难度极大,不易成功。
因此,随着调峰后工况的新一步恶化,提高末级叶片防水蚀性能和安全可靠性,变得非常迫切和关键。
发明内容
本发明目的在于提供一种解决深度调峰工况下汽轮机末级叶片水蚀问题的抗水蚀涂层及其制备方法。采用本发明方法制备的抗水蚀涂层可在叶片进/出气边形成保护涂层,从而达到抗水蚀的效果,解决了深度调峰工况下汽轮机末级叶片因水蚀加剧造成的叶片开裂、断裂等导致机组发生强烈振动的恶性事故。
为达到上述目的,本发明采用如下技术方案:
一种汽轮机末级叶片水蚀防护涂层,所述防水蚀涂层包括金属底层和位于金属底层之上的防水蚀层;
所述金属底层的原材料为NiCrBSi粉末,粉末成分质量百分含量范围如下:Cr:13-16%,B:2-5%,Si:3-7%,Fe:3.7%,C:1-2%,余量为Ni及不可避免的杂质;
所述防水蚀层为:NiCrBSi-YSZ,其中YSZ为8%Y2O3稳定ZrO2;所述防水蚀层中YSZ为纳米结构;
所述防水蚀层中NiCrBSi质量百分比为10-25%,其余为YSZ。
所述金属底层厚度为0.1-0.15mm。
所述防水蚀层厚度为0.2-0.4mm;
所述的汽轮机末级叶片水蚀防护涂层的制备方法,包括如下步骤:
步骤1:对发生水蚀损伤部位进行打磨处理,获得光滑的可用于喷涂的表面后,进行喷砂处理;对新叶片,则直接喷砂处理;上述两种情况喷砂处理后的表面粗糙度Ra达到80-100微米;
步骤2:将NiCrBSi粉末与纳米YSZ粉末进行机械混合,得到防水蚀层粉末材料,其中NiCrBSi质量百分比为10-25%,其余为YSZ;
步骤3:对金属底层NiCrBSi粉末和防水蚀层粉末材料进行低温烘干,烘干温度150℃-200℃;
步骤4:采用活性燃烧高速燃气喷涂设备喷涂防水蚀涂层的金属底层,喷涂工艺参数为:空气压力为0.4-0.6MPa,丙烷压力为0.4-0.65MPa,氮气流量为50-60L/min,喷涂距离为300-325mm;喷涂分多道进行;
步骤5:采用大气等离子喷涂设备喷涂防水蚀涂层中的抗水蚀层,喷涂工艺参数为:电流为600-700A,电压为50-65V,主气Ar流量为55-65slpm,二次气H2流量为3.5-4.5slpm,喷涂距离为70-90mm;喷涂分多道进行;
金属底层作为过渡层起到缓解叶片基材和陶瓷防水蚀层间的膨胀系数不匹配问题,减缓陶瓷防水蚀层在制备及使用过程中因温度变化导致的脱落;采用活性燃烧高速燃气喷涂设备喷涂的金属底层涂层孔隙率小,涂层致密,且无内氧化;金属底层作为陶瓷防水蚀层的“软底”,在服役过程中分散水滴对防水蚀层表面的冲击;
防水蚀层中添加一定量的金属底层粉末,采用大气等离子喷涂工艺喷涂,喷涂完成后的涂层中金属相填充了陶瓷层中的孔隙位置,使得防水蚀层更加致密。
金属过渡层起到缓解叶片基材和陶瓷防水蚀层间的膨胀系数不匹配问题,减缓陶瓷防水蚀层在制备及使用过程中因温度变化导致的脱落;其次,采用活性燃烧高速燃气喷涂设备喷涂的金属底层涂层孔隙率远远小其它热喷涂工艺制备涂层孔隙率,涂层足够致密,且基本无内氧化。金属过渡层可作为陶瓷防水蚀层的“软底”,可在服役过程中分散水滴对防水蚀层表面的冲击;
防水蚀层中添加一定量的过渡层金属粉末,采用大气等离子喷涂工艺喷涂,喷涂完成后的涂层中金属相填充了原来陶瓷层中的孔隙位置,使得防水蚀层更加致密,耐水蚀性能更加优异。
与传统钎焊司太立合金片的方法相比较,通过采用本发明所述的软底加致密水蚀层结构及其制备方法获得的抗水层涂层,其抗水蚀效果提高2-3倍。
本发明具有如下优点:
1)本发明所制备的金属底层和抗水蚀层涂层采用软底加硬面的结构,有效的缓解了水滴对防水蚀层的表面冲击,同时,致密化的防水蚀层,进一步提高了涂层服役寿命;
2)本发明采用热喷涂工艺(活性燃烧高速燃气喷涂设备/大气等离子喷涂设备)操作简单,可实现原位、小间隙位置喷涂大面积喷涂。相比于激光熔覆工艺,对熔覆距离不敏感,更易实施。
具体实施方式
下面结合具体实施方式对本发明作进一步详细说明。
实施例:针对某600MW机组汽轮机叶片司太立合金发生水蚀的现象,首先,对锯齿状的损伤进行打磨,形成平整的表面,对待防护区域周边通过0.5mm薄铁皮进行防护,采用24目的棕刚玉进行喷砂,喷砂完成后对喷砂部位采用高压干燥空气进行清理。采用NiCrBSi粉末作为金属过渡层,并采用活性燃烧高速燃气喷涂设备进行喷涂,喷涂工艺参数为:空气压力为0.45MPa,丙烷压力为0.5MPa,氮气流量为50L/min,喷涂距离为310mm。喷涂分多道进行,喷涂厚度为0.1mm。采用NiCrBSi-YSZ粉末制备抗水蚀层,其中NiCrBSi质量百分比为15%,通过混粉器将NiCrBSi-YSZ进行机械混合后进行涂层制备。采用大气等离子喷涂设备喷涂抗水蚀层,喷涂工艺参数为:电流为650A,电压为50V,主气(Ar)流量为55slpm,二次气(H2)为流量4slpm,喷涂距离为80mm。喷涂分多道进行,喷涂厚度为0.3mm。在喷涂过程中,熔融金属相填充了陶瓷层中的孔隙位置,使得抗水蚀层孔隙率降低,抗水蚀层更加致密。此外,金属底层作为过渡层的存在,使得涂层界面间结合更好,更紧密。同时上述喷涂方法可斜角度进行,因此不受汽轮机现场窄空间施工限制。
Claims (4)
1.一种汽轮机末级叶片水蚀防护涂层,其特征在于:所述防水蚀涂层包括金属底层和位于金属底层之上的防水蚀层;
所述金属底层的原材料为NiCrBSi粉末,粉末成分质量百分含量范围如下:Cr:13-16%,B:2-5%,Si:3-7%,Fe:3.7%,C:1-2%,余量为Ni及不可避免的杂质;
所述防水蚀层为:NiCrBSi-YSZ,其中YSZ为8%Y2O3稳定ZrO2;所述防水蚀层中YSZ为纳米结构;
所述防水蚀层中NiCrBSi质量百分比为10-25%,其余为YSZ。
2.根据权利要求1所述的一种汽轮机末级叶片水蚀防护涂层,其特征在于:所述金属底层厚度为0.1-0.15mm。
3.根据权利要求1所述的一种汽轮机末级叶片水蚀防护涂层,其特征在于:所述防水蚀层厚度为0.2-0.4mm。
4.权利要求1至3任一项所述的汽轮机末级叶片水蚀防护涂层的制备方法,其特征在于,包括如下步骤:
步骤1:对发生水蚀损伤部位进行打磨处理,获得光滑的可用于喷涂的表面后,进行喷砂处理;对新叶片,则直接喷砂处理;上述两种情况喷砂处理后的表面粗糙度Ra达到80-100微米;
步骤2:将NiCrBSi粉末与纳米YSZ粉末进行机械混合,得到防水蚀层粉末材料,其中NiCrBSi质量百分比为10-25%,其余为YSZ;
步骤3:对金属底层NiCrBSi粉末和防水蚀层粉末材料进行低温烘干,烘干温度150℃-200℃;
步骤4:采用活性燃烧高速燃气喷涂设备喷涂防水蚀涂层的金属底层,喷涂工艺参数为:空气压力为0.4-0.6MPa,丙烷压力为0.4-0.65MPa,氮气流量为50-60L/min,喷涂距离为300-325mm;喷涂分多道进行;
步骤5:采用大气等离子喷涂设备喷涂防水蚀涂层中的抗水蚀层,喷涂工艺参数为:电流为600-700A,电压为50-65V,主气Ar流量为55-65slpm,二次气H2流量为3.5-4.5slpm,喷涂距离为70-90mm;喷涂分多道进行;
金属底层作为过渡层起到缓解叶片基材和陶瓷防水蚀层间的膨胀系数不匹配问题,减缓陶瓷防水蚀层在制备及使用过程中因温度变化导致的脱落;采用活性燃烧高速燃气喷涂设备喷涂的金属底层涂层孔隙率小,涂层致密,且无内氧化;金属底层作为陶瓷防水蚀层的“软底”,在服役过程中分散水滴对防水蚀层表面的冲击;
防水蚀层中添加一定量的金属底层粉末,采用大气等离子喷涂工艺喷涂,喷涂完成后的涂层中金属相填充了陶瓷层中的孔隙位置,使得防水蚀层更加致密。
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