CN104630683B - 一种可抗流化床灰冲刷和结垢的电弧喷涂材料 - Google Patents
一种可抗流化床灰冲刷和结垢的电弧喷涂材料 Download PDFInfo
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- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
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Abstract
本发明涉及一种热喷涂材料,特别涉及一种可抗流化床灰冲刷和结垢的电弧喷涂材料,属于抗磨材料技术领域。该电弧喷涂材料按质量百分比范围包括如下成分:高纯NiCr粉27.0‑30.0%,镍包铝粉末12.0‑14.0%,TiFe2粉末8.0‑10.0%,Nb2N粉末6.0‑9.0%,CrB2粉末5.0‑7.0%,MoC纳米粉末4.0‑6.0%,V2C纳米粉末3.0‑5.0%,镍包二硫化钼2.0‑3.0%,FeMn纳米粉末1.0‑2.0%,余铁。本发明耐磨涂层具有低的孔隙率(孔隙率<2%),较高的接合强度(在常温高于50MPa),优良的抗冲击韧性,其600℃高温硬度HV0.3>350。适用于作为燃煤锅炉抗流化床灰冲刷和结垢的电弧喷涂表面涂层。
Description
技术领域
本发明涉及一种热喷涂材料,特别涉及一种可抗流化床灰冲刷和结垢的电弧喷涂材料,属于抗磨材料技术领域。
背景技术
循环流化床燃烧技术是近年来迅速发展起来的一种洁净燃烧技术。该技术具有煤种适应性强、燃烧效率高、污染物排放低和负荷调节性能好等优点,是国内目前大力推广应用的炉型。但是,由于炉内有各种床料及循环物料,煤在物化状态下低温循环燃烧,会造成烟气中含有大量的床灰颗粒,这些灰粒高速冲刷水冷壁管、对流受热面等关键部位,使其壁面受到剧烈磨损,发生局部的严重破坏,甚至还会导致停炉事故。究其原因,由于燃料中的灰分、水分以及硫分的存在,使得锅炉各个受热面的工作条件变得恶劣起来。并且,我国的锅炉燃料多为劣质煤,煤中含有灰分,煤粉炉燃烧完成后,这些灰分最终都要排放出锅炉本体,其中绝大部分是经过尾部受热面后到达除尘器的。由于此时的烟气中含有灰粒和未完全燃烧的煤粉颗粒的高速烟气流经锅炉受热面管屏时,粒子的每次撞击都会将管壁上的金属屑剥离下来,从而使受热面管屏的管壁逐渐减薄,对该部分的受热面造成较大的磨削,这就是床灰冲刷。
另外,循环流化床在富氧燃烧环境下床灰会逐渐碳酸化,其中温度是氧化钙碳酸化的重要影响因素。温度升高会加速碳酸化反应,包括增大反应速率和最终转化率。富氧燃烧下,循环流化床锅炉中的高温受热面将是氧化钙发生碳酸化并可能加速结垢的主要部位。在一定温度下,高的二氧化碳浓度会加速氧化钙的碳酸化反应,从而得到更高的转化率。这种结垢物在受热面表面形成碳酸钙沉淀物,增加了受热面表层的热障,极大地降低了锅炉的换热效率;同时,沉淀物对于锅炉运行非常有害,会使锅炉管道表面碳化而剥落。
我国燃煤发电厂中出现的很多锅炉灾害都是由于对流受热面受床灰冲刷和结垢而产生泄漏,爆管等而被迫停炉检修的。
鉴于此,研究对流受热面的抗流化床灰冲刷和结垢,对缓解电厂泄漏,爆管等事故具有非常明显的现实意义。
床灰冲蚀冲刷的机理非常复杂,它是各种因素综合作用的结果。采用耐高温防磨防结垢材料对易受冲刷部位进行喷涂。喷涂层与管壁附着力强,传热性好,致密耐磨,又能避免床灰结垢,一举两得。相比传统的防磨盖板或防磨罩而言,喷涂涂层不妨碍烟气通流,不会增大烟速,又能有效提高受热面防磨防结垢能力,是卓有成效的解决方案。
纳米合金是一类很有发展前途的新型材料。呈纳米晶粒的合金要比传统的粗晶粒合金硬12倍以上,金属—陶瓷复合纳米材料则可在更大的范围内改变材料的力学性质,具有极高的强度、韧度和耐磨耐蚀性能。纳米喷涂层中的纳米粒子具有大的比表面积,能阻碍位错等晶体缺陷的滑移;同时涂层表面的纳米粒子具有极小的孔径和孔容,可起到截留阻挡床灰的渗透作用,给与床灰在其表面上吸附的空间有限,不利于其固着及结垢;在后续的床灰冲击下,少量吸附在表层的床灰也会迅速脱落,能有效防止结垢的形成。
通过对纳米材料及纳米技术的研究,在电弧热喷涂涂层中添加了一系列高熵中间体,并从快速冷却的热喷涂工艺中有效地解决了纳米涂层的产生及分散问题,使涂层具有较强的抗流化床灰冲刷和结垢的性能。
电弧热喷涂技术是制备纳米涂层的有效方法。电弧喷涂具有快速加热、快速冷却并可以现场大面积施工、成本低、涂层性能稳定等特点,可广泛应用于防磨工业领域,经国内外检索未见抗流化床灰冲刷和结垢的专用电弧喷涂材料的专利报道。
发明内容
针对上述问题,本发明的目的是提供可抗流化床灰冲刷和结垢,且有较高的结合强度和抗热冲击能力的专用电弧喷涂材料,从而可替代市场上已有的普通耐磨电弧喷涂材料。
为了实现上述目的本发明采用如下技术方案:一种可抗流化床灰冲刷的电弧喷涂材料,该电弧喷涂材料按质量百分比范围包括如下成分: NiCr粉27.0-30.0%、镍包铝粉末12.0-14.0%、TiFe2粉末8.0-10.0%、Nb2N粉末6.0-9.0%、CrB2粉末5.0-7.0%、MoC纳米粉末4.0-6.0%、V2C纳米粉末3.0-5.0%、镍包二硫化钼2.0-3.0%、FeMn纳米粉末1.0-2.0%、余铁。
进一步的,上述的可抗流化床灰冲刷的电弧喷涂材料,该电弧喷涂材料按质量百分比范围包括如下成分:
NiCr粉28.0-29.0%、镍包铝粉末13.0-14.0%、TiFe2粉末8.0-9.0%、Nb2N粉末7.0-8.0%、CrB2粉末6.0%、MoC纳米粉末4.0-6.0%、V2C纳米粉末3.0-4.0%、镍包二硫化钼2.0-3.0%、FeMn纳米粉末1.0-1.5%、余铁。
本发明的制作工艺如下:
1、首先将H08低碳钢钢带轧成U形,再向U形槽中加入占喷涂粉芯材料总质量38%的含上述发明Ni、Cr、Al、Ti、Nb、Mo、V、B、N、S、C、Mn等元素的合金成分粉末;
2、将U形槽合口为O型,把粉末包裹其中,然后通过拉丝机逐道拉拔、减径,最后粉芯材料的直径达到规定值2mm,从而得到本发明的产品。
本发明有如下有益效果:
使用本发明研制的材料在经过喷砂粗化后的金属基体上按照现有技术中的电弧喷涂工艺参数进行施工,得到的涂层中含有大量纳米涂层结构,其组织均匀、硬度极高,常温HV0.3>950,孔隙率<2%;本发明耐磨涂层具有较高的接合强度(在常温高于50MPa),优良的抗冲击韧性,其600℃高温硬度HV0.3>350。适用于作为燃煤锅炉抗流化床灰冲刷和结垢的电弧喷涂表面涂层。
具体实施方式
实施例1
取含上述发明成分,即含上述发明Ni、Cr、Al、Ti、Nb、Mo、V、B、N、S、C、Mn等元素的合金成分粉末适量,放入混粉机内混合30分钟,然后将混合粉末加入低碳钢带的U形槽中;将U型槽合口,使药粉包裹其中,然后通过拉丝机逐道拉拔、减径,最后使其直径达到规定值2.0mm的电弧喷涂材料,该电弧喷涂材料按质量百分比范围包括如下成分: NiCr粉28.0%,镍包铝粉末13.0%,TiFe2粉末8.0%,Nb2N粉末7.0%, CrB2粉末6.0%,MoC纳米粉末4.0%,V2C纳米粉末3.0%,镍包二硫化钼2.0%,FeMn纳米粉末1.0%,余铁。
实施例2
取含上述发明成分,即含上述发明Ni、Cr、Al、Ti、Nb、Mo、V、B、N、S、C、Mn等元素的合金成分粉末适量,放入混粉机内混合30分钟,然后将混合粉末加入低碳钢带的U形槽中;将U型槽合口,使药粉包裹其中,然后通过拉丝机逐道拉拔、减径,最后使其直径达到规定值2.0mm的电弧喷涂材料,该电弧喷涂材料按质量百分比范围包括如下成分: NiCr粉29.0%,镍包铝粉末14.0%,TiFe2粉末9.0%,Nb2N粉末8.0%, CrB2粉末6.0%,MoC纳米粉末6.0%,V2C纳米粉末4.0%,镍包二硫化钼3.0%,FeMn纳米粉末1.5%,余铁。
如表1所示,本发明研制的电弧喷涂涂层高温硬度值大,耐磨性好;其高温相对耐磨性,超过了目前市场上普通电弧喷涂材料,能有效提高锅炉受热面在高温冲刷和结垢环境中的使用性能、大大延长使用寿命。
表1
400℃硬度(HV0.3) | 500℃硬度(HV0.3) | 600℃硬度(HV0.3) | 涂层三个月挂片试验 | |
实施例1 | 570 | 485 | 368 | 污垢增重1.4% |
实施例2 | 562 | 465 | 361 | 污垢增重1.3% |
Claims (2)
1.一种可抗流化床灰冲刷的电弧喷涂材料的原料制备而成的涂层,其特征在于,该电弧喷涂材料按质量百分比范围包括如下成分: NiCr粉27.0-30.0%、镍包铝粉末12.0-14.0%、TiFe2粉末8.0-10.0%、Nb2N粉末6.0-9.0%、CrB2粉末5.0-7.0%、MoC纳米粉末4.0-6.0%、V2C纳米粉末3.0-5.0%、镍包二硫化钼2.0-3.0%、FeMn纳米粉末1.0-2.0%、余铁。
2.根据权利要求1所述的可抗流化床灰冲刷的电弧喷涂材料的原料制备而成的涂层,其特征在于,该电弧喷涂材料按质量百分比范围包括如下成分:
NiCr粉28.0-29.0%、镍包铝粉末13.0-14.0%、TiFe2粉末8.0-9.0%、Nb2N粉末7.0-8.0%、CrB2粉末6.0%、MoC纳米粉末4.0-6.0%、V2C纳米粉末3.0-4.0%、镍包二硫化钼2.0-3.0%、FeMn纳米粉末1.0-1.5%、余铁。
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