CN112323066A - 一种适用于大型构件的扩散阻挡层制备方法 - Google Patents
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Abstract
一种适用于大型构件的扩散阻挡层制备方法,渗铝剂制备:将铝铁块装入容器内,加入铝铁块质量百分比0.5%~1.0%的氟化氢铵,再加入水,直至漫过铝铁块表面,然后在加热炉中加热并在270~330℃保温,直至煮干;两次活化处理之间进行一次700~900℃的焙烧;除油:将需要渗铝的零、组件,包括试样,用有机溶剂把表面脏污及油污清洗干净;液体吹砂:渗铝前零组件需经液体吹砂,风压不超过0.3Mpa;气相渗铝:900~1050℃,保温1~3.5小时,炉内相对压力控制在0.002MPa~0.01Mpa之间。本发明的优点:形成的氧化铝阻挡层完整、连续、致密且在高温长时间下稳定存在;可用于大型构件扩散阻挡层的制备;原材料成本低,工艺简单,生产效率高。
Description
技术领域
本发明涉及,特别涉及一种适用于大型构件的扩散阻挡层制备方法。
背景技术
某些涂层需要在高温服役过程中保持其本身的功能性,但在高温长时间的条件下,涂层与基体材料之间会发生互扩散,导致表面涂层失效。因此需要在基体材料与表面涂层之间制备扩散阻挡层,有效地阻止涂层与基体发生互扩散,保证涂层的性能。
发明内容
本发明的目的是为了可以实现在基体金属与表面涂层之间形成稳定、连续、致密、完整的氧化铝膜层,有效地阻挡基体材料与表面涂层发生互扩散,保持表面涂层本身的性能,特提供了一种适用于大型构件的扩散阻挡层制备方法。
本发明提供了一种适用于大型构件的扩散阻挡层制备方法,其特征在于:所述的适用于大型构件的扩散阻挡层制备方法,具体包括以下步骤:
渗铝剂制备:
将铝铁块装入容器内,加入铝铁块质量百分比0.5%~1.0%的氟化氢铵,再加入水,直至漫过铝铁块表面,然后在加热炉中加热并在270~330℃保温,直至煮干;两次活化处理之间进行一次700~900℃的焙烧;
除油:
将需要渗铝的零、组件,包括试样,用有机溶剂把表面脏污及油污清洗干净;
液体吹砂:
渗铝前零组件需经液体吹砂,风压不超过0.3Mpa;
气相渗铝:
900~1050℃,保温1~3.5小时,炉内相对压力控制在0.002MPa~0.01Mpa之间。
所述的适用于大型构件的扩散阻挡层制备方法,还包括将制件放入真空炉中进行真空预氧化,工艺参数为900℃~1070℃,保温1~4小时,800℃以上100Pa分压充氩冷却。
所述的适用于大型构件的扩散阻挡层制备方法,还包括采用大气预氧化,工艺参数为760℃~950℃,保温3小时~6小时,空冷。
所述的有机溶剂包括汽油或丙酮。
渗铝剂配制与焙烧:将铝铁合金块和氟化氢铵粉末按比例配制成渗铝剂,渗铝剂至少经两次活化和一次焙烧,才能用于渗铝。
渗铝参数的制定:将配制好的渗剂及预先处理好的零件装入渗灌,向炉内通入氩气排净炉内废气,并维持炉内正压。通过试验摸索,选取渗铝温度,并经一定时间的保温后获得渗铝层。
预氧化参数的制定:为了在渗铝层表面生成氧化铝膜层作为扩散阻挡层,需将制件在空气炉、真空炉中进行高温预氧化处理,通过试验确定了预氧化温度、时间及控制要求等。
按一定比例配制渗铝剂,并对渗剂进行多次活化和焙烧;在氩气保护条件下,采用气相渗铝方法,在高温合金制件表面获得渗铝层;通过高温预氧化在渗铝层表面生成一层氧化铝膜,该氧化铝膜层可以作为扩散阻挡层,能有效地阻挡高温合金基体与氧化铝膜外表面涂敷面层的互扩散。
制备的氧化铝膜层致密、完整、连续和稳定,能够在高温长时间条件下有效地阻止基体材料与表面涂层发生互扩散,使表面涂层充分地发挥本身所具有的性能。该技术适用于大型零组件的生产,生产效率高,具有广泛的应用前景。
可以用于高温合金材料扩散阻挡层,有效地阻挡基体材料和表面涂层发生互扩散,保持表面涂层的功能性,同时也可以改善材料表面的抗氧化性、抗腐蚀性、硬度、耐磨性等。该工艺方法的生产效率高,可用于大型构件扩散阻挡层的制备。在高温合金制件防护涂层领域具有广泛的价值。
本发明的优点:
本发明所述的适用于大型构件的扩散阻挡层制备方法,形成的氧化铝阻挡层完整、连续、致密且在高温长时间下稳定存在;氧化铝阻挡层能够有效的阻挡表面涂层和基体材料发生互扩散,经900℃保温300小时耐热试验后,表面涂层仍完好,保持其本身的特性;所涉及到的化学热处理和真空或常规热处理方法不受制件形状和结构的限制,工艺适应性强,且可用于大型构件扩散阻挡层的制备;可实现制件局部制备扩散阻挡层;所需的原材料成本低,工艺简单,生产效率高。
附图说明
下面结合附图及实施方式对本发明作进一步详细的说明:
图1是渗铝-预氧化后的截面形貌,渗铝层的渗层深度在0.02mm~0.055mm,表面形成0.5μm~2μm的氧化铝膜;
图2是试片渗铝-预氧化后的表面形貌。
具体实施方式
实施例1
本发明提供了一种适用于大型构件的扩散阻挡层制备方法,其特征在于:所述的适用于大型构件的扩散阻挡层制备方法,具体包括以下步骤:
渗铝剂制备:
将铝铁块装入容器内,加入铝铁块质量百分比0.5%~1.0%的氟化氢铵,再加入水,直至漫过铝铁块表面,然后在加热炉中加热并在270~330℃保温,直至煮干;两次活化处理之间进行一次700~900℃的焙烧;
除油:
将需要渗铝的零、组件,包括试样,用有机溶剂把表面脏污及油污清洗干净;
液体吹砂:
渗铝前零组件需经液体吹砂,风压不超过0.3Mpa;
气相渗铝:
900~1050℃,保温1~3.5小时,炉内相对压力控制在0.002MPa~0.01Mpa之间。
所述的适用于大型构件的扩散阻挡层制备方法,还包括采用大气预氧化,工艺参数为760℃~950℃,保温3小时~6小时,空冷。
所述的有机溶剂包括汽油或丙酮。
渗铝剂配制与焙烧:将铝铁合金块和氟化氢铵粉末按比例配制成渗铝剂,渗铝剂至少经两次活化和一次焙烧,才能用于渗铝。
渗铝参数的制定:将配制好的渗剂及预先处理好的零件装入渗灌,向炉内通入氩气排净炉内废气,并维持炉内正压。通过试验摸索,选取渗铝温度,并经一定时间的保温后获得渗铝层。
预氧化参数的制定:为了在渗铝层表面生成氧化铝膜层作为扩散阻挡层,需将制件在空气炉、真空炉中进行高温预氧化处理,通过试验确定了预氧化温度、时间及控制要求等。
按一定比例配制渗铝剂,并对渗剂进行多次活化和焙烧;在氩气保护条件下,采用气相渗铝方法,在高温合金制件表面获得渗铝层;通过高温预氧化在渗铝层表面生成一层氧化铝膜,该氧化铝膜层可以作为扩散阻挡层,能有效地阻挡高温合金基体与氧化铝膜外表面涂敷面层的互扩散。
制备的氧化铝膜层致密、完整、连续和稳定,能够在高温长时间条件下有效地阻止基体材料与表面涂层发生互扩散,使表面涂层充分地发挥本身所具有的性能。该技术适用于大型零组件的生产,生产效率高,具有广泛的应用前景。
可以用于高温合金材料扩散阻挡层,有效地阻挡基体材料和表面涂层发生互扩散,保持表面涂层的功能性,同时也可以改善材料表面的抗氧化性、抗腐蚀性、硬度、耐磨性等。该工艺方法的生产效率高,可用于大型构件扩散阻挡层的制备。在高温合金制件防护涂层领域具有广泛的价值。
实施例2
本发明提供了一种适用于大型构件的扩散阻挡层制备方法,其特征在于:所述的适用于大型构件的扩散阻挡层制备方法,具体包括以下步骤:
渗铝剂制备:
将铝铁块装入容器内,加入铝铁块质量百分比0.5%~1.0%的氟化氢铵,再加入水,直至漫过铝铁块表面,然后在加热炉中加热并在270~330℃保温,直至煮干;两次活化处理之间进行一次700~900℃的焙烧;
除油:
将需要渗铝的零、组件,包括试样,用有机溶剂把表面脏污及油污清洗干净;
液体吹砂:
渗铝前零组件需经液体吹砂,风压不超过0.3Mpa;
气相渗铝:
900~1050℃,保温1~3.5小时,炉内相对压力控制在0.002MPa~0.01Mpa之间。
所述的适用于大型构件的扩散阻挡层制备方法,还包括将制件放入真空炉中进行真空预氧化,工艺参数为900℃~1070℃,保温1~4小时,800℃以上100Pa分压充氩冷却。
渗铝剂配制与焙烧:将铝铁合金块和氟化氢铵粉末按比例配制成渗铝剂,渗铝剂至少经两次活化和一次焙烧,才能用于渗铝。
渗铝参数的制定:将配制好的渗剂及预先处理好的零件装入渗灌,向炉内通入氩气排净炉内废气,并维持炉内正压。通过试验摸索,选取渗铝温度,并经一定时间的保温后获得渗铝层。
预氧化参数的制定:为了在渗铝层表面生成氧化铝膜层作为扩散阻挡层,需将制件在空气炉、真空炉中进行高温预氧化处理,通过试验确定了预氧化温度、时间及控制要求等。
按一定比例配制渗铝剂,并对渗剂进行多次活化和焙烧;在氩气保护条件下,采用气相渗铝方法,在高温合金制件表面获得渗铝层;通过高温预氧化在渗铝层表面生成一层氧化铝膜,该氧化铝膜层可以作为扩散阻挡层,能有效地阻挡高温合金基体与氧化铝膜外表面涂敷面层的互扩散。
制备的氧化铝膜层致密、完整、连续和稳定,能够在高温长时间条件下有效地阻止基体材料与表面涂层发生互扩散,使表面涂层充分地发挥本身所具有的性能。该技术适用于大型零组件的生产,生产效率高,具有广泛的应用前景。
可以用于高温合金材料扩散阻挡层,有效地阻挡基体材料和表面涂层发生互扩散,保持表面涂层的功能性,同时也可以改善材料表面的抗氧化性、抗腐蚀性、硬度、耐磨性等。该工艺方法的生产效率高,可用于大型构件扩散阻挡层的制备。在高温合金制件防护涂层领域具有广泛的价值。
Claims (4)
1.一种适用于大型构件的扩散阻挡层制备方法,其特征在于:所述的适用于大型构件的扩散阻挡层制备方法,具体包括以下步骤:
渗铝剂制备:将铝铁块装入容器内,加入铝铁块质量百分比0.5%~1.0%的氟化氢铵,再加入水,直至漫过铝铁块表面,然后在加热炉中加热并在270~330℃保温,直至煮干;两次活化处理之间进行一次700~900℃的焙烧;
除油:将需要渗铝的零、组件,包括试样,用有机溶剂把表面脏污及油污清洗干净;
液体吹砂:渗铝前零组件需经液体吹砂,风压不超过0.3Mpa;
气相渗铝:900~1050℃,保温1~3.5小时,炉内相对压力控制在0.002MPa~0.01Mpa之间。
2.根据权利要求1所述的适用于大型构件的扩散阻挡层制备方法,其特征在于:所述的适用于大型构件的扩散阻挡层制备方法,还包括将制件放入真空炉中进行真空预氧化,工艺参数为900℃~1070℃,保温1~4小时,800℃以上100Pa分压充氩冷却。
3.根据权利要求1所述的适用于大型构件的扩散阻挡层制备方法,其特征在于:所述的适用于大型构件的扩散阻挡层制备方法,还包括采用大气预氧化,工艺参数为760℃~950℃,保温3小时~6小时,空冷。
4.根据权利要求1所述的适用于大型构件的扩散阻挡层制备方法,其特征在于:所述的有机溶剂包括汽油或丙酮。
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