CN106435447A - 一种渣浆泵过流部件表面等离子喷涂修补工艺 - Google Patents

一种渣浆泵过流部件表面等离子喷涂修补工艺 Download PDF

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CN106435447A
CN106435447A CN201611011433.2A CN201611011433A CN106435447A CN 106435447 A CN106435447 A CN 106435447A CN 201611011433 A CN201611011433 A CN 201611011433A CN 106435447 A CN106435447 A CN 106435447A
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张达明
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Wuxi Mingsheng Textile Machinery Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06—Metallic material
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof

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Abstract

本发明公开了一种渣浆泵过流部件表面等离子喷涂修补工艺，其包括：(1)对待修补过流部件表面进行喷砂粗化；(2)将所述喷砂粗化后的过流部件表面用丙酮和乙醇洗涤，干燥；(3)在干燥的待修补过流部件表面用火焰喷涂NiCrBSi粘结底层；(4)在NiCrBSi粘结底层上等离子喷涂Al2O3‑TiN‑Si3N4陶瓷涂层。本发明通过选用特定的耐磨蚀耐腐蚀材料，通过大气等离子喷涂工艺，修补了过流部件表面，并对整个过流部件表面进行了强化，增加了其耐腐蚀和耐磨蚀性能。

Description

一种渣浆泵过流部件表面等离子喷涂修补工艺
技术领域
本发明涉及材料技术领域，尤其涉及一种渣浆泵过流部件表面等离子喷涂修补工艺。
背景技术
离心式渣浆泵磨粒磨损及腐蚀性磨蚀。离心式渣浆泵过流部件多采用韧性材料，其水流动力学磨粒磨损是由微切削磨损和变形磨损组成的复合磨损。离心式渣浆泵正常运转过程中，流经于过流部件的液圊两相浆体的流态是紊流状态，浆体中固体颗粒(煤、矸石、磁铁矿粉)的形状处于随机取向。
以小角度冲击过流部件表面的固体颗粒，以尖角与表面接触时，在接触点很小的面积上将产生很高的冲击压力，冲击压力的垂直分量使固体颗粒压人材料表面，冲击压力的水平分量使其沿大致平行于过流部件表面的方向移动，使材料表面接触点产生横向塑性变形，从而切出一定量的微体积材料，造成过流部件的微切削磨损。
以大冲角冲击过流部件表面的固体颗粒在冲击压力的垂直分量作用下，使固体颗粒压人材料表面形成弹塑性变形，到颗粒停止压入运动为止，最终形成不能恢复的塑性变形-冲击凹坑，在凹坑边缘有塑性变形挤出的材料堆积物。冲击坑边缘堆积物将重新受挤压变形和移位而从材料表面剥落，引起一定量的微体积材料损失，造成过流部件的变形磨损。
同时，由于渣浆泵处理的流体中含有各种腐蚀性液体，因此会在过流部件表面腐蚀造成凹痕、腐蚀面等。
发明内容
本发明的目的在于提出一种渣浆泵过流部件表面等离子喷涂修补工艺，能够将所述过流部件表面进行修补。
为达此目的，本发明采用以下技术方案：
一种渣浆泵过流部件表面等离子喷涂修补工艺，其包括：
(1)对待修补过流部件表面进行喷砂粗化；
(2)将所述喷砂粗化后的过流部件表面用丙酮和乙醇洗涤，干燥；
(3)在干燥的待修补过流部件表面用火焰喷涂NiCrBSi粘结底层，喷涂距离为100mm～150mm，喷涂角度为60°～90°之间，送粉气流量为0.6～0.8m3/h，涂层厚度为150-200μm；
(4)在NiCrBSi粘结底层上等离子喷涂Al2O3-TiN-Si3N4陶瓷涂层，喷涂距离为100mm～150mm，等离子焰流轴线与被喷涂试样表面的角度不应小于45°，喷涂角度在45°～90°之间，送粉气流量为0.6～0.8m3/h，涂层厚度为350-700μm。
本发明通过在被腐蚀被磨蚀的过流部件表面涂覆一层浆料，所述浆料填补各种腐蚀凹坑或者裂隙，并在整个过流部件表面形成光滑的外表。
相较于其他的粘结底层，本发明采用NiCrBSi作为粘结底层，其起到了降低热处理温度、改善基体与工作层连接性质的作用，实现良好的结合。
本发明所述的NiCrBSi，其各成分之间比例不做特定限定，各个成分只要达到有效量即可。例如，其含量为Cr 14-18wt％、B 3-4.5wt％、Si 3.5-5.5wt％，Ni余量。
所述Al2O3-TiN-Si3N4陶瓷涂层中，各成分在有效量范围内即可，例如Al2O3:TIN摩尔比为7-3:0.5-2:1。
TiN具有典型的NaCl型结构，属面心立方点阵，晶格常数a＝0.4241nm，其中钛原子位于面心立方的角顶。TiN是非化学计量化合物，其稳定的组成范围为TiN0.37-TiN1.16，氮的含量可以在一定的范围内变化而不引起TiN结构的变化。TiN粉末一般呈黄褐色，超细TiN粉末呈黑色，而TiN晶体呈金黄色。TiN熔点为2950℃，密度为5.43-5.44g/cm3，莫氏硬度8-9，抗热冲击性好。TiN熔点比大多数过渡金属氮化物的熔点高，而密度却比大多数金属氮化物低，因此是一种很有特色的耐热材料。因此本发明将TiN与Al2O3联用，其不仅耐磨性能出色，同时具有极强的防腐蚀性能。
优选的，本发明在过流部件表面喷砂粗化处理之前，将过流部件加热到80-100℃。喷涂前对基体材料进行适当预热，可以消除试样表面的水分和湿气，提高喷涂粒子与基底接触时的界面温度，减少因基体材料与涂层材料的热膨胀差异造成的应力导致的涂层开裂，从而提高涂层与基体的结合强度。
本发明选用NiCrBSi合金粉末作为梯度陶瓷涂层中间层。NiCrBSi合金粉末是使用温度较高、高温综合性能优异的合金粉末。Cr的硬度高，生成的Cr2O3氧化膜不仅能阻止气体对涂层的进一步氧化，同时还可以增强涂层的耐磨性。。
本发明的涂层显微硬度大于1020HV，远远高于镁合金基体的显微硬度(不到100HV)，大大提高了其耐磨性能。
采用盐水浸泡试验，也称全浸腐蚀试验。24h后结果如下，未喷涂试样腐蚀剧烈，腐蚀严重，表面形成大量黑色点蚀坑，表面变的凹凸不平，有大量腐蚀产物产生。而喷涂试样腐蚀缓慢，基本未受到腐蚀。
本发明通过选用特定的耐磨蚀耐腐蚀材料，通过等离子喷涂工艺，修补了过流部件表面，并对整个过流部件表面进行了强化，增加了其耐腐蚀和耐磨蚀性能。
具体实施方式
下面通过具体实施方式来进一步说明本发明的技术方案。
实施例1
一种渣浆泵过流部件表面等离子喷涂修补工艺，其包括：
(1)对待修补过流部件表面进行喷砂粗化；
(2)将所述喷砂粗化后的过流部件表面用丙酮和乙醇洗涤，干燥；
(3)在干燥的待修补过流部件表面用火焰喷涂NiCrBSi粘结底层，喷涂距离为100mm，喷涂角度为60°，送粉气流量为0.6m3/h，涂层厚度为150μm；
(4)在NiCrBSi粘结底层上等离子喷涂Al2O3-TiN-Si3N4陶瓷涂层，喷涂距离为100mm，等离子焰流轴线与被喷涂试样表面的角度不应小于45°，喷涂角度在45°，送粉气流量为0.6m3/h，涂层厚度为350μm。
实施例2
一种渣浆泵过流部件表面等离子喷涂修补工艺，其包括：
(1)对待修补过流部件表面进行喷砂粗化；
(2)将所述喷砂粗化后的过流部件表面用丙酮和乙醇洗涤，干燥；
(3)在干燥的待修补过流部件表面用火焰喷涂NiCrBSi粘结底层，喷涂距离为150mm，喷涂角度为90°之间，送粉气流量为0.8m3/h，涂层厚度为200μm；
(4)在NiCrBSi粘结底层上等离子喷涂Al2O3-TiN-Si3N4陶瓷涂层，喷涂距离为150mm，等离子焰流轴线与被喷涂试样表面的角度不应小于45°，喷涂角度在90°，送粉气流量为0.8m3/h，涂层厚度为700μm。
实施例3
一种渣浆泵过流部件表面等离子喷涂修补工艺，其包括：
(1)对待修补过流部件表面进行喷砂粗化；
(2)将所述喷砂粗化后的过流部件表面用丙酮和乙醇洗涤，干燥；
(3)在干燥的待修补过流部件表面用火焰喷涂NiCrBSi粘结底层，喷涂距离为120mm，喷涂角度为80°，送粉气流量为0.7m3/h，涂层厚度为180μm；
(4)在NiCrBSi粘结底层上等离子喷涂Al2O3-TiN-Si3N4陶瓷涂层，喷涂距离为130mm，等离子焰流轴线与被喷涂试样表面的角度不应小于45°，喷涂角度在60°，送粉气流量为0.7m3/h，涂层厚度为500μm。
实施例1-3所述修补后的过流部件，经冲蚀速度为10m/s、冲蚀角为70°、冲蚀时间为连续48小时连续冲蚀磨损后，其体积磨损量只是不添加涂层的过流部件的20％左右，同时整个填补的涂层表面完整，没有剥离现象。

Claims (1)

1.一种渣浆泵过流部件表面等离子喷涂修补工艺，其包括：
(1)对待修补过流部件表面进行喷砂粗化；
(2)将所述喷砂粗化后的过流部件表面用丙酮和乙醇洗涤，干燥；
(3)在干燥的待修补过流部件表面用火焰喷涂NiCrBSi粘结底层，喷涂距离为100mm～150mm，喷涂角度为60°～90°之间，送粉气流量为0.6～0.8m3/h，涂层厚度为150-200μm；
(4)在NiCrBSi粘结底层上等离子喷涂Al2O3-TiN-Si3N4陶瓷涂层，喷涂距离为100mm～150mm，等离子焰流轴线与被喷涂试样表面的角度不应小于45°，喷涂角度在45°～90°之间，送粉气流量为0.6～0.8m3/h，涂层厚度为350-700μm。
CN201611011433.2A 2016-11-17 2016-11-17 一种渣浆泵过流部件表面等离子喷涂修补工艺 Pending CN106435447A (zh)

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