CN108048789A - 双相不锈钢等离子体阳极氮化表面强化工艺 - Google Patents
双相不锈钢等离子体阳极氮化表面强化工艺 Download PDFInfo
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Abstract
本发明公开了一种双相不锈钢等离子体阳极氮化表面强化技工艺,包括以下步骤:(1)双相不锈钢表面预处理;(2)等离子体辅助阳极氮化:采用等离子辅助阳极氮化技术对超低碳双相不锈钢碟片进行表面改性与强化处理,将表面预处理后的双相不锈钢放入阳极氮化装置中氮化处理;(3)退火。本发明可以有效抑制脆性相的形成,使碟片表层至心部具有优异的强韧配合,在保证组织均匀、力学性能优异的基础上,尽量减少工件因温度梯度导致的二次变形,同时可以避免“打弧”和“边缘效应”等对处理表面造成的粗化损伤,同时还有利于白亮亚稳态化合物S相的形成,抑制ε‑Fe2‑3N和γ’‑Fe4N等脆性相的析出,使碟片具有较高的硬度、耐磨和耐蚀性能。
Description
技术领域
本发明涉及一种金属表面强化技术,特别涉及一种双相不锈钢等离子体阳极氮化表面强化工艺技术,采用等离子辅助阳极氮化技术对超低碳双相不锈钢碟片进行表面改性与强化处理。
背景技术
目前国内淀粉分离机为喷嘴连续出料型碟式分离机,主要用于淀粉工业中的淀粉精制,预浓缩,蛋白分离及淀粉回收等,也可以用于食品,医药,染化,环保等部门的液固两相分离,浓缩回收和澄清等工艺过程,如高龄土,纸浆的回收,废水处理等。我国制造碟式淀粉分离机的时间较短,其主要技术有从国外同类产品消化吸收而来。目前我国制造的碟式淀粉分离机的转鼓组件由多个零件组成,内部结构复杂,不仅装配繁琐,而且进料系统容易堵塞,设备运行十天就必须停车清洗转鼓,无法实现三相分离,大大降低了设备工作效率。西方发达国家在固液分离领域研究较早,目前的技术也较为全面、完整,已有大量的商业应用的实例,但是这些公司的产品价格极为昂贵,设备维修又麻烦,费用也相对高昂。
碟式淀粉分离机的大型化、智能化、多功能化、高速率高精度及性材料的应用是未来的发展趋势,而国内淀粉分离机的最新发展方向,必然是碟式淀粉分离机产品的更新换代。材料作为研究碟式淀粉分离机更新换代新产品的一个重要方面,受到许多研究者的关注,其中,研究双相不锈钢的表面改性与强化工艺,提高双相不锈钢在大型碟式分离机中的应用能力,是未来碟式淀粉分离机产品更新换代的基础之一,也是未来碟式分离机部件用双相不锈钢的发展方向之一。
发明内容
本发明的目的是为了提供一种双相不锈钢等离子体阳极氮化表面强化工艺,采用等离子辅助阳极氮化技术对超低碳双相不锈钢碟片进行表面改性与强化处理。
本发明一种双相不锈钢等离子体阳极氮化表面强化工艺,其技术方案包括以下步骤:
(1)双相不锈钢表面预处理:主要过程包括:脱脂、工业清洁剂清洗、水洗、干燥;
(2)等离子体辅助阳极氮化:采用等离子辅助阳极氮化技术对超低碳双相不锈钢碟片进行表面改性与强化处理,将步骤(1)所述的表面预处理后的双相不锈钢放入阳极氮化装置中,控制渗氮工艺参量,氩气分压0.05-0.75Pa,氮气分压0.5-750Pa,偏压35-2000V,氮化温度200-350℃,氮化时间1-3.5小时;
(3)退火:将步骤(2)所述的等离子体辅助阳极氮化表面强化后的双相不锈钢在气体氛围或真空环境中退火,退火温度控制在500-1100℃范围内,退火速率控制在5-100℃/s。
优选的,步骤(2)所述的等离子体辅助技术是基于氩气在低压装置中产生的,其中电离电压控制在20-40V之间,电离电流控制在10-180A之间。
优选的,步骤(2)所述的阳极氮化装置中的氮源可以是氮气,也可以是氨气,或二者的混合气体。
优选的,步骤(3)所述的气体氛围可以是氮气、氩气中的一种或几种,也可以是其与氢气、氨气中的一种或几种的混合气体氛围。
优选的,本发明所述的渗氮处理方法渗氮温度较低、温度梯度较小,能够有效降低氮化处理导致碟片和转鼓产生的附加变形,表面强化后的双相不锈钢特别适用于一种玉米油、水、沉渣等介质的双相不锈钢大型分离机碟片。
与传统的渗氮技术相比,本发明的优点为:
(1)本发明的渗氮工艺参量匹配,可以有效得抑制脆性相的形成,使碟片表层至心部具有优异的强韧配合。同时,在保证组织均匀、力学性能优异的基础上,尽量减少工件因温度梯度导致的二次变形。
(2)本发明的渗氮处理方法温度低、周期短、渗层较厚且均匀,一方面可以避免“打弧”和“边缘效应”等对处理表面造成的粗化损伤,加剧摩擦磨损,另一方面能够有利于白亮亚稳态化合物S相的形成,抑制ε-Fe2-3N和γ’-Fe4N等脆性相的析出,使碟片具有较高的硬度、耐磨和耐蚀性能;
(3)本发明的渗氮处理方法的渗氮温度较低、温度梯度较小,还能够有效降低氮化处理导致碟片和转鼓产生的附加变形,表面强化后的双相不锈钢特别适用于一种玉米油、水、沉渣等介质的双相不锈钢大型分离机碟片。
具体实施方式
为了更好地说明本发明,附实施例如下。需要强调的是,实施例并不意味着本发明的范围限制在实施例叙述的条件内,实施例的目的是进一步阐述本发明的内容及其可行性。
实施例1:
一种双相不锈钢等离子体阳极氮化表面强化工艺,其技术方案包括以下步骤:
(1)双相不锈钢表面预处理:主要过程包括:先用三氯乙烯溶剂对双相不锈钢进行脱脂处理、然后用工业清洁剂在90℃下浸渍清洗10分钟,再经水洗后,在93℃下干燥,既得表面预处理后的双相不锈钢;
(2)等离子体辅助阳极氮化:采用等离子辅助阳极氮化技术对超低碳双相不锈钢碟片进行表面改性与强化处理,将步骤(1)所述的表面预处理后的双相不锈钢放入阳极氮化装置中,控制渗氮工艺参量,氩气分压0.5Pa,氮气分压500Pa,偏压800V,氮化温度250℃,氮化时间1.5小时;
(3)退火:将步骤(2)所述的等离子体辅助阳极氮化表面强化后的双相不锈钢在氮气氛围中进行退火处理,退火温度控制在800℃,退火速率控制在45℃/s。
实施例2:
一种双相不锈钢等离子体阳极氮化表面强化工艺,其技术方案包括以下步骤:
(1)双相不锈钢表面预处理:主要过程包括:先用己酸乙酯溶剂对双相不锈钢进行脱脂处理、然后用工业清洁剂在83℃下浸渍清洗15分钟,再经水洗后,在70℃下干燥,既得表面预处理后的双相不锈钢;
(2)等离子体辅助阳极氮化:采用等离子辅助阳极氮化技术对超低碳双相不锈钢碟片进行表面改性与强化处理,将步骤(1)所述的表面预处理后的双相不锈钢放入阳极氮化装置中,控制渗氮工艺参量,氩气分压0.05Pa,氨气分压150Pa,偏压200V,氮化温度200℃,氮化时间1小时;
(3)退火:将步骤(2)所述的等离子体辅助阳极氮化表面强化后的双相不锈钢在氮气和氩气(体积比1∶1)氛围进行退火处理,退火温度控制在1100℃,退火速率控制在80℃/s。
实施例3:
一种双相不锈钢等离子体阳极氮化表面强化工艺,其技术方案包括以下步骤:
(1)双相不锈钢表面预处理:主要过程包括:先用丙酮溶剂对双相不锈钢进行脱脂处理、然后用工业清洁剂在70℃下浸渍清洗15分钟,再经水洗后,在93℃下干燥,既得表面预处理后的双相不锈钢;
(2)等离子体辅助阳极氮化:采用等离子辅助阳极氮化技术对超低碳双相不锈钢碟片进行表面改性与强化处理,将步骤(1)所述的表面预处理后的双相不锈钢放入阳极氮化装置中,控制渗氮工艺参量,氩气分压0.3Pa,氮气和氨气(体积比为2∶1)分压0.5Pa,偏压35V,氮化温度300℃,氮化时间1.5小时;
(3)退火:将步骤(2)所述的等离子体辅助阳极氮化表面强化后的双相不锈钢在氩气氛围中进行退火处理,退火温度控制在780℃,退火速率控制在40℃/s。
实施例4:
一种双相不锈钢等离子体阳极氮化表面强化工艺,其技术方案包括以下步骤:
(1)双相不锈钢表面预处理:主要过程包括:先用乙酸乙酯溶剂对双相不锈钢进行脱脂处理、然后用工业清洁剂在85℃下浸渍清洗12分钟,再经水洗后,在85℃下干燥,既得表面预处理后的双相不锈钢;
(2)等离子体辅助阳极氮化:采用等离子辅助阳极氮化技术对超低碳双相不锈钢碟片进行表面改性与强化处理,将步骤(1)所述的表面预处理后的双相不锈钢放入阳极氮化装置中,控制渗氮工艺参量,氩气分压0.4Pa,氮气和氨气(体积比为1∶1)分压750Pa,偏压1900V,氮化温度280℃,氮化时间2小时;
(3)退火:将步骤(2)所述的等离子体辅助阳极氮化表面强化后的双相不锈钢在氮气、氩气和氢气(体积比为2∶1∶1)氛围中进行退火处理,退火温度控制在500℃,退火速率控制在10℃/s。
实施例5:
一种双相不锈钢等离子体阳极氮化表面强化工艺,其技术方案包括以下步骤:
(1)双相不锈钢表面预处理:主要过程包括:先用丙酮溶剂对双相不锈钢进行脱脂处理、然后用工业清洁剂在90℃下浸渍清洗5分钟,再经水洗后,在70℃下干燥,既得表面预处理后的双相不锈钢;
(2)等离子体辅助阳极氮化:采用等离子辅助阳极氮化技术对超低碳双相不锈钢碟片进行表面改性与强化处理,将步骤(1)所述的表面预处理后的双相不锈钢放入阳极氮化装置中,控制渗氮工艺参量,氩气分压0.75Pa,氮气分压300Pa,偏压650V,氮化温度350℃,氮化时间1.2小时;
(3)退火:将步骤(2)所述的等离子体辅助阳极氮化表面强化后的双相不锈钢在氮气和氩气(体积比3∶1)氛围进行退火处理,退火温度控制在1000℃,退火速率控制在100℃/s。
实施例6:
一种双相不锈钢等离子体阳极氮化表面强化工艺,其技术方案包括以下步骤:
(1)双相不锈钢表面预处理:主要过程包括:先用三氯乙烯溶剂对双相不锈钢进行脱脂处理、然后用工业清洁剂在80℃下浸渍清洗10分钟,再经水洗后,在40℃暖空气下干燥30min,既得表面预处理后的双相不锈钢;
(2)等离子体辅助阳极氮化:采用等离子辅助阳极氮化技术对超低碳双相不锈钢碟片进行表面改性与强化处理,将步骤(1)所述的表面预处理后的双相不锈钢放入阳极氮化装置中,控制渗氮工艺参量,氩气分压0.2Pa,氨气分压100Pa,偏压300V,氮化温度300℃,氮化时间3小时;
(3)退火:将步骤(2)所述的等离子体辅助阳极氮化表面强化后的双相不锈钢在氮气、氩气和氨气(体积比为1∶2∶2)氛围中进行退火处理,退火温度控制在650℃,退火速率控制在5℃/s。
Claims (5)
1.一种双相不锈钢等离子体阳极氮化表面强化工艺,其技术方案包括以下步骤:
(1)双相不锈钢表面预处理:主要过程包括:脱脂、工业清洁剂清洗、水洗、干燥;
(2)等离子体辅助阳极氮化:采用等离子辅助阳极氮化技术对超低碳双相不锈钢碟片进行表面改性与强化处理,将步骤(1)所述的表面预处理后的双相不锈钢放入阳极氮化装置中,控制渗氮工艺参量,氩气分压0.05-0.75Pa,氮气分压0.5-750Pa,偏压35-2000V,氮化温度200-350℃,氮化时间1-3.5小时;
(3)退火:将步骤(2)所述的等离子体辅助阳极氮化表面强化后的双相不锈钢在气体氛围或真空环境中退火,退火温度控制在500-1100℃范围内,退火速率控制在5-100℃/s。
2.根据权利要求1所述的一种双相不锈钢等离子体阳极氮化表面强化工艺,其特征在于,步骤(2)所述的等离子体辅助技术是基于氩气在低压装置中产生的,其中电离电压控制在20-40V之间,电离电流控制在10-180A之间。
3.根据权利要求1所述的一种双相不锈钢等离子体阳极氮化表面强化工艺,其特征在于,步骤(2)所述的阳极氮化装置中的氮源可以是氮气,也可以是氨气,或二者的混合气体。
4.根据权利要求1所述的一种双相不锈钢等离子体阳极氮化表面强化工艺,其特征在于,步骤(3)所述的气体氛围可以是氮气、氩气中的一种或几种,也可以是其与氢气、氨气中的一种或几种的混合气体氛围。
5.根据权利要求1所述的一种双相不锈钢等离子体阳极氮化表面强化工艺,其特征在于,所述渗氮处理方法降低氮化处理导致碟片和转鼓产生的附加变形,表面强化后的双相不锈钢适用于一种玉米油、水、沉渣等介质的双相不锈钢大型分离机碟片。
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