CN110157521B - 一种锆合金热挤压润滑和热防护用材料及制备方法 - Google Patents
一种锆合金热挤压润滑和热防护用材料及制备方法 Download PDFInfo
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Abstract
本发明属于润滑剂领域,涉及一种锆合金热挤压润滑和热防护用材料及制备和应用方法。润滑和热防护用材料由基础粉末、有机硅树脂和无水乙醇组成,其中有机硅树脂、无水乙醇和基础粉末的配比为1:3:6,基础粉末的组成为:40%~50%的低软化点玻璃粉;5%~10%的Al2O3粉末;5%~10%的滑石粉;5%~10%的云母粉;10%~15%的MoS2粉;10%~15%的石墨粉。本发明可有效减小锆合金热挤压时的摩擦系数,且涂覆于锆合金坯料上时不易脱落,同时在加热、保温与挤压过程中为锆合金提供良好的热防护效果、有效减少合金与周围气氛的反应。
Description
技术领域:
本发明属于润滑剂领域,特别涉及一种锆合金热挤压润滑和热防护用材料及其制备方法。
背景技术:
锆合金具有较小的热中子吸收截面、适中的力学性能及良好的加工性能,是核动力反应堆用结构部件和燃料包壳材料的优质选择[1]。锆合金主要用来生产棒材、管材和板材,而热挤压是锆合金棒材尤其是管材生产中最主要的加工方式。
由于锆合金的挤压温度高、变形抗力大、容易粘模等原因,润滑是锆合金热挤压成形的关键技术,采用合理的润滑方式可以降低挤压力,延长工模具使用寿命,提高制品质量,降低挤压能耗[2]。同时,锆合金具有较强的热态化学活性,高温下可与周围介质中的氢、氧、氮、一氧化碳、二氧化碳及水蒸气化合,产生氧化皮、氢化物等,影响材料的使用性能[3]。
玻璃润滑是目前锆合金等难挤压金属最先进的润滑方式,不仅其成本较低,能够提供良好的润滑作用,并且能够提供较好的绝热、抗氧化、减少吸氢量等防护效果,延长工模具使用期限,提高挤压制品的性能、表面质量,降低挤压能耗[4,5]。制备锆合金热挤压用润滑剂的难点在于除了要保证其在高温下具有良好的润滑效果,并且要有一定的附着力、高温流动性与隔热、防护效果。
目前工业上应用的钛合金热挤压用玻璃润滑剂并不能很好的适用于锆合金挤压[6],这是由于钛合金是在加热至指定温度,例如1000℃,在其表面以滚涂或喷涂的方式施加玻璃润滑剂,而锆合金的挤压温度远低于钛合金,使用此方法很难将润滑剂均匀涂覆于坯料表面。此外,相对于钛合金,锆合金在加热与保温时,更容易与周围环境发生反应,要避免其吸氧、吸氢、吸氮等。因此,锆合金热挤压需要一种同时满足润滑与热防护效果的材料,在坯料加热之前涂覆于坯料表面,防止坯料与周围气氛反应,这要求润滑材料具有良好的致密性与附着力,保证坯料在移动过程中润滑材料不发生脱落。国内锆合金挤压用润滑剂主要依赖于进口。
近年来随着我国核电的加速发展,锆合金需求量持续增加,实现锆合金挤压用玻璃润滑剂的国产化具有十分重要的意义。本发明提出了一种由低软化点玻璃粉、Al2O3粉、滑石粉、云母粉、MoS2粉、石墨粉、有机硅树脂等组成的高温润滑和热防护材料,可有效减小锆合金挤压时的摩擦系数,且涂覆于锆合金坯料上时不易脱落,同时防止合金加热时与周围气氛的反应。
参考文献:
[1]李献军.锆及锆合金概述[J].钛工业进展,2011,28(1):38-38.
[2]谢建新,刘静安.金属挤压理论与技术.第2版[M].冶金工业出版社,2012.
[3]李韵豪.锆及锆合金塑性变形加工的感应加热(上)[J].金属加工(热加工),2016(15):60-63
[4]崔顺,李中奎,文惠民,等.玻璃润滑在钛合金型材挤压中的应用[J].山西冶金,2016,39(2):44-46.
[5]刘长勇,张人佶,颜永年,等.玻璃润滑热挤压工艺的润滑行为分析[J].机械工程学报,2011,47(20):127-134.
[6]段素杰,惠松骁,徐哲,等.钛合金型材热挤压用玻璃润滑剂:中国,CN201310481682.8[P].2014.
发明内容:
本发明提供了一种锆合金热挤压润滑和热防护材料,其特点是高温下兼具润滑和热防护性能,且与高合金具有较强的附着力,可有效减小锆合金挤压时的摩擦系数,减少锆合金在加热和保温过程中吸收周围的氢、氮、氧等气体,从而降低挤压力、提高生产效率、提高挤压制品质量。
一种锆合金热挤压润滑和热防护材料,由基础粉末、有机硅树脂与无水乙醇组成,其中基础粉末的比例为:
(1)50%~60%粒度1000~3000目的低软化点玻璃粉,其主要组成为:60wt%的P2O5、6wt%的B2O3、21wt%的ZnO、13wt%的Na2O+K2O;
(2)5%~10%颗粒度1.5μm的Al2O3粉末;
(3)10%~15%粒度1250目的滑石粉;
(4)5%~10%粒度800目的云母粉;
(5)10%~15%粒度3000目的MoS2粉;
(6)10%~15%粒度8000目的石墨粉。
如上所述锆合金热挤压润滑和热防护材料的制备方法,包括以下步骤:
(1)制备基础粉末:将低软化点玻璃等粉末按质量百分比:低软化点玻璃粉50%~60%、Al2O3粉末5%~10%、滑石粉10%~15%、云母粉5%~10%、MoS210%~15%、石墨粉10%~15%进行配料混合,机械混合均匀,获得基础粉末。
(2)制备润滑和热防护材料:将有机硅树脂、无水乙醇和基础粉末按质量比1:3:6混合搅拌均匀,得到涂覆润滑和热防护材料。
如上所述锆合金热挤压润滑和热防护材料的应用方法,将配制好的润滑和热防护材料均匀涂覆于锆合金坯料或挤压筒表面,在室温下静置3~6h或在100~180℃保温0.5~2h使其干燥,然后进行热挤压。
本发明的优点:
(1)良好的润滑效果。在750℃时,采用圆环压缩法测得摩擦因子近似为0.2,与工厂目前使用进口产品相比,润滑效果基本相同甚至更好。
(2)一定的附着力与流动性。该润滑和热防护材料涂覆于锆合金坯料表面后有较强的附着力,不易脱落,并且在高温下具有一定的流动性。
(3)良好的热防护性。在锆合金坯料加热、保温以及热挤压时为其提供热防护效果,有效减少坯料吸收周围的氢、氮、氧等气体。
具体实施方式
实施例1:用于锆-铌合金挤压
按质量百分比:低软化点玻璃粉50%、Al2O3粉末8%、滑石粉12%、云母粉10%、MoS210%、石墨粉10%进行配料,机械混合均匀,获得基础粉末。按质量比基础粉末60%、有机硅树脂10%、无水乙醇30%混合,搅拌均匀,涂覆于锆合金挤压坯料表面或挤压筒内壁,室温静置干燥,然后热挤压。
实施例2:用于锆-锡合金挤压
按质量百分比:低软化点玻璃粉40%、Al2O3粉末8%、滑石粉12%、云母粉10%、MoS215%、石墨粉15%进行配料,机械混合均匀,获得基础粉末。按质量比润滑剂粉体60%、有机硅树脂10%、无水乙醇30%混合,搅拌均匀,涂覆于锆合金挤压坯料表面或挤压筒内壁,180℃保温0.5h干燥后进行热挤压。
Claims (2)
1.一种锆合金热挤压润滑和热防护用材料,其特征在于由基础粉末、有机硅树脂、无水乙醇组成,其中基础粉末的组成按质量百分比为:
(1)50%~60%粒度1000~3000目的低软化点玻璃粉,其主要组成为:60wt%的P2O5、6wt%的B2O3、21wt%的ZnO、13wt%的Na2O+K2O;
(2)5%~10%颗粒度1.5μm的Al2O3粉末;
(3)10%~15%粒度1250目的滑石粉;
(4)5%~10%粒度800目的云母粉;
(5)10%~15%粒度3000目的MoS2粉;
(6)10%~15%粒度8000目的石墨粉;
将配制好的润滑和热防护材料均匀涂覆于锆合金坯料或挤压筒表面,在室温下静置3~6h或在100~180℃保温0.5~2h使其干燥,然后进行热挤压;
有机硅树脂、无水乙醇和基础粉末的质量配比为1:3:6。
2.如权利要求1所述锆合金热挤压润滑和热防护用材料的制备方法,其特征在于包括以下步骤:
(1)制备基础粉末:将基础粉末按质量百分比:低软化点玻璃粉50%~60%、Al2O3粉末5%~10%、滑石粉10%~15%、云母粉5%~10%、MoS210%~15%、石墨粉10%~15%进行配料混合,机械混合均匀,获得基础粉末;
(2)制备润滑和热防护材料:将有机硅树脂、无水乙醇和基础粉末以1:3:6的质量配比混合搅拌均匀,得到润滑和热防护材料。
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