CN110355372B - 一种通过粉末轧制制备高硅钢薄片的方法 - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 41
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 36
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Abstract
一种通过粉末轧制制备高硅钢薄片的方法,属于粉末冶金技术领域。本发明采用电解铁粉、被铁粉包覆的硅粉,经v型混料机简单混料后形成Fe‑6.5wt.%Si混合元素粉。通过粉末轧制的方法形成生坯薄板,经高温烧结使其冶金结合,多道次热轧至一定厚度后再经2‑4次冷轧,最后在高温下进行退火得到具有优良性能的高硅钢薄片。采用粉末轧制方法能够有效缩短制备薄片的工艺流程,原料中采用被铁粉包覆的硅粉极大提升了粉末体系的成形性,避免了因添加成形剂导致的工艺复杂性及后续的脱胶残碳问题,具有操作简单、生产效率高、产品精度高、无污染与夹杂、性能优异等优点。
Description
技术领域
本发明属于粉末冶金技术领域,涉及一种通过粉末轧制制备高硅钢薄片的方法。
背景技术
磁性材料主要分为永磁和软磁材料两类。永磁材料主要用于提供稳定磁场、信息存储等方面,软磁材料主要用于电力电子行业中电动能能量转化、电磁信号转换等。软磁材料的剩磁和矫顽力均很小,在磁场中容易反复磁化,当外磁场去掉后,获得的磁性会大部分或全部丧失,因此已广泛应用于电工设备和电子设备中。传统软磁材料的发展经历了从纯铁、硅钢、坡莫合金到软磁铁氧体的过程。
其中硅钢是电力、电子和电讯工业用以制造发电机、电动机、变压器、继电器、互感器以及其它电器仪表的重要磁性材料,是产量最大的金属功能材料之一。硅钢的性能比铁优越,具有电阻率高(是电工纯铁的几倍)、涡流损耗低、饱和磁感应强度高、价格便宜且稳定性好等优点,而且易于批量生产,是目前应用量最大的软磁材料。硅含量对硅钢的特性影响很大,随着硅含量的增加,硅钢的磁滞伸缩系数减小,铁损降低,磁导率增加,当硅含量达到6.5%时,硅钢的磁导率达到最大值,磁致伸缩趋近于零,具有优异的磁学性能,是实现电磁设备高效、节能、轻便化的理想材料。
6.5%Si硅钢虽具有优异的磁学性能和广泛的应用前景,但6.5%Si高硅钢的质地脆,加工性能较差,难以用常规轧制方法制备,因而制约了其生产和应用。目前硅钢的制备主要寻求两种途径:一是针对硬度进行合金的韧化,二是采用新工艺避开合金的脆性。迄今为止,硅钢主要的制备工艺有传统轧制工艺、温轧工艺、薄带连铸工艺、快速凝固工艺、CVD工艺、粉末轧制工艺等几种。世界范围内除日本NKK公司外尚无大规模生产6.5%Si硅钢的企业,但对于6.5%Si硅钢的需求量与日俱增,现生产能力远不能满足市场需求。
我国目前使用的6.5wt%高硅钢大部分依赖进口。在现阶段,国内外已经开发了几种制备6.5wt%高硅钢板带材的方法(如快速凝固法、粉末压延法逐步增塑法等)。但上述方法虽然在一定程度上避开或解决了该合金的难变形问题,但均只停留在实验室研究阶段,难以适用工业化生产,高硅钢板带材。因此,研究和开发简单、经济、有效、成熟的高硅钢工艺路线是极其重要的。
发明内容
本发明的目的在于提供一种通过粉末轧制制备高硅钢薄片的方法。采用粉末轧制有效地缩短了制备高硅钢薄片的工艺流程。传统方法中,由于大量Si粉的加入导致粉末体系轧制成形性极大降低,所以需要添加有机成形剂以实现其良好结合与成型;此外,加入成形剂还会导致在后续脱胶和烧结中不可避免的出现残碳问题。而本发明提出采用被铁粉包覆的硅粉,极大提升了混合粉末体系的成形性,避免了因添加有机成形剂导致的工艺复杂性及后续的脱胶残碳问题。同时,采用具有发达树枝状、优良成形性特点的电解铁粉,进一步保证轧制成形性。
本发明方法具有操作简单、生产效率高、产品精度高、无污染与夹杂、保证了高硅钢薄片优良的磁学和力学性能。
一种通过粉末轧制制备高硅钢薄片的方法,其具体步骤为:
(1)原材料准备:采用-325目的电解铁粉;以及制备被铁粉包覆的硅粉,称作SF粉;
(2)混料:将电解铁粉、SF粉按照Fe-6.5wt.%Si进行配料,混料,混合0.5-2h,制成混合粉末;
(3)粉末轧制:采用45°倾斜轧机,利用轧辊与粉末间的摩擦力喂料,轧制出厚度为0.8-2.0mm,宽度为60-300mm,密度为6.1-6.7g/cm3的生坯薄板;
(4)真空烧结:将步骤(3)中的生坯薄板在1250-1350℃下真空烧结1-3h,实现冶金结合和元素扩散均匀化;
(5)热轧:将上述烧结板坯加热至850-980℃后进行3-8次热轧,热轧至板坯厚度≤0.5mm;
(6)冷轧:热轧过后,可以直接进行2-4次冷轧至板坯厚度0.1-0.3mm;
(7)高温真空退火:将冷轧后的板坯于800-1000℃真空退火0.5-3h,随炉冷却后得到具有优异组织和性能的高硅钢薄片。
进一步地,步骤(1)中所述的SF粉是由在制备羰基铁粉的过程中加入粒径≤20um的Si粉,其中硅粉质量是铁粉质量的2-4倍,制备出被羰基铁粉包覆的硅粉。
进一步地,步骤(2)所述采用v型混料机进行低能混料,防止粉末加工硬化。
进一步地,步骤(3)所述的粉末轧制采用俄罗斯二辊45°倾斜轧机,以利于生坯薄板的可轧长度的增加。
进一步地,步骤(4)所述的真空烧结中生坯薄板和陶瓷片间隔铺叠。
进一步地,步骤(5)中所述的多道次热轧中,每道次热轧后需重新充分加热后进行下一道次。
进一步地,步骤(6)中所述的冷轧紧跟在热轧后面,由于热轧过后,板坯相当于淬火,有效避免有序相的生成,其脆性减小,在热轧后直接冷轧板坯而不至开裂。
进一步地,步骤(7)中所述的高温真空退火后必须随炉缓慢冷却。
本发明的优点:
(1)利用粉末轧制方法能够有效缩短制备高硅钢薄片的工艺流程;
(2)采用被铁粉包覆的硅粉作为原料,极大提升了轧制成形性,同时避免了因添加成形剂导致的工艺复杂性及后续的脱胶残碳问题;
(3)利用热轧后组织的无序性导致脆性降低而可以直接冷轧,实现将热轧和冷轧工艺无缝结合;
(4)操作简单、生产效率高、产品精度高、避免了污染与夹杂,有利于实现工业化生产。
具体实施方式
实施案例1:
(1)在制备羰基铁粉的过程中加入粒径≤20um的Si粉,其中硅粉质量是铁粉质量的2倍,制备出被羰基铁粉包覆的硅粉,即SF粉。
(2)将-325目的电解铁粉和制备的SF粉按照质量分数120:13的比例混合,形成Fe-6.5%Si的混合粉末,采用v型混料机将上述粉末混合0.5h;
(3)采用俄罗斯二辊45°倾斜轧机,利用轧辊与粉末间的摩擦力喂料,轧制出厚度为1.2mm,宽度为80mm,密度为6.22g/cm3的生坯薄板;
(4)将生坯薄板以陶瓷片相隔,在1300℃下真空烧结2h,实现冶金结合和元素扩散均匀化;
(5)将上述烧结板坯加热至930℃后进行6次热轧,热轧至板坯厚度0.5mm;
(6)热轧过后,直接进行4次冷轧至板坯厚度0.2mm;
(7)将冷轧后的板坯于950℃真空退火1.5h,随炉冷却后得到具有优异组织和性能的高硅钢薄片。
实施案例2:
(1)在制备羰基铁粉的过程中加入粒径≤20um的Si粉,其中硅粉质量是铁粉质量的4倍,制备出被羰基铁粉包覆的硅粉,即SF粉。
(2)将-325目的电解铁粉和制备的SF粉按照质量分数147:13的比例混合,形成Fe-6.5%Si的混合粉末,采用v型混料机将上述粉末混合2h;
(3)采用俄罗斯二辊45°倾斜轧机,利用轧辊与粉末间的摩擦力喂料,轧制出厚度为1.0mm,宽度为160mm,密度为6.41g/cm3的生坯薄板;
(4)将生坯薄板以陶瓷片相隔,在1350℃下真空烧结1h,实现冶金结合和元素扩散均匀化;
(5)将上述烧结板坯加热至850℃后进行8次热轧,热轧至板坯厚度0.4mm;
(6)热轧过后,直接进行3次冷轧至板坯厚度0.15mm;
(7)将冷轧后的板坯于1000℃真空退火1h,随炉冷却后得到具有优异组织和性能的高硅钢薄片。
Claims (7)
1.一种通过粉末轧制制备高硅钢薄片的方法,其特征在于:以粉末轧制的方法将混合元素粉末近净成形,实现高硅钢薄片的高效率制备,具体步骤如下:
(1)原材料准备:采用-325目的电解铁粉;以及制备被铁粉包覆的硅粉,称作SF粉;
(2)混料:将电解铁粉、SF粉按照Fe-6.5wt.%Si进行配料,混合0.5-2h,制成混合粉末;
(3)粉末轧制:采用45°倾斜轧机,利用轧辊与粉末间的摩擦力喂料,轧制出厚度为0.8-2.0mm,宽度为60-300mm,密度为6.1-6.7g/cm3的生坯薄板;
(4)真空烧结:将步骤(3)中的生坯薄板在1250-1350℃下真空烧结1-3h,实现冶金结合和元素扩散均匀化;
(5)多道次热轧:将上述烧结板坯加热至850-980℃后进行3-8次热轧,热轧至板坯厚度≤0.5mm;
(6)冷轧:热轧过后,直接进行2-4次冷轧至板坯厚度0.1-0.3mm;
(7)高温真空退火:将冷轧后的板坯于800-1000℃真空退火0.5-3h,随炉冷却后得到具有优异组织和性能的高硅钢薄片;
步骤(1)中所述的SF粉是由在制备羰基铁粉的过程中加入粒径≤20μm的Si粉,制备出被羰基铁粉包覆的硅粉,其中硅粉质量是铁粉质量的2-4倍。
2.按照权利要求1所述一种通过粉末轧制制备高硅钢薄片的方法,其特征在于:步骤(2)采用v型混料机进行低能混料,防止粉末加工硬化。
3.按照权利要求1所述一种通过粉末轧制制备高硅钢薄片的方法,其特征在于:步骤(3)所述的粉末轧制是采用俄罗斯二辊45°倾斜轧机,以利于生坯薄板的可轧长度的增加。
4.按照权利要求1所述一种通过粉末轧制制备高硅钢薄片的方法,其特征在于:步骤(4)所述的真空烧结中生坯薄板和陶瓷片间隔铺叠。
5.按照权利要求1所述一种通过粉末轧制制备高硅钢薄片的方法,其特征在于:步骤(5)中所述的多道次热轧中,每道次热轧后需重新充分加热后进行下一道次轧制。
6.按照权利要求1所述一种通过粉末轧制制备高硅钢薄片的方法,其特征在于:步骤(6)中所述的冷轧紧跟在热轧后面,由于热轧过后,板坯相当于淬火,有效避免有序相的生成,其脆性减小,在热轧后直接冷轧板坯而不至开裂。
7.按照权利要求1所述一种通过粉末轧制制备高硅钢薄片的方法,其特征在于:步骤(7)中所述的高温真空退火后必须随炉缓慢冷却。
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