CN112537950A - 一种高温合金夹渣过滤网和应用 - Google Patents

一种高温合金夹渣过滤网和应用 Download PDF

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CN112537950A
CN112537950A CN202011380400.1A CN202011380400A CN112537950A CN 112537950 A CN112537950 A CN 112537950A CN 202011380400 A CN202011380400 A CN 202011380400A CN 112537950 A CN112537950 A CN 112537950A
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杨金侠
梁静静
李雪
徐福涛
王志辉
孟杰
周亦胄
孙晓峰
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Abstract

本发明涉及精密铸造和材料制备领域,具体为一种高温合金夹渣过滤网和应用。首先,选择过滤网原材料为刚玉粉、二氧化硅、碳粉和硅溶胶等,刚玉粉包含粒度20~80目的刚玉粉和粒度200~1000目的刚玉粉。然后,将两种粒度的刚玉粉混合均匀;加入碳粉,混制均匀;加硅溶胶调和均匀。经过冷静压成型、真空热烧结强化、打磨清理等步骤制成高温强度在30~100MPa的过滤网,把过滤网安放到浇注系统中。最后,在铸造工艺下浇注合金液,浇注温度在1350~1550℃之间,浇注时间3~60s,冷却后,检验O、N和S成分,验证过滤网的有效性。本发明适用于所有金属材料的铸造过程,特别适用于较高温度的浇注过程。

Description

一种高温合金夹渣过滤网和应用
技术领域:
本发明涉及精密铸造和材料制备领域,具体为一种高温合金夹渣过滤网和应用
背景技术:
夹渣是铸造零件中主要缺陷之一,因夹渣而导致铸件合格率严重大面积下降,是目前一些精密铸件铸造过程主要问题之一,尤其是高温浇注的铸件,对坩埚咬蚀严重,导致陶瓷剥落,侵入性合金液中,形成夹渣。夹渣去除成为二次重熔浇注的产品首要问题,尤其超高温浇注时,铸件中形成夹渣的几率增加。
发明内容:
本发明的目的在于提供一种高温合金夹渣过滤网和应用,能够解决高温浇注过程的夹渣问题,适用于所有金属材料的铸造过程,特别适用于超高温浇注过程。
本发明的技术方案是:
一种高温合金夹渣过滤网,选择过滤网原材料为刚玉粉、二氧化硅粉、碳粉和硅溶胶,按质量百分比计,刚玉粉含量80~90%,二氧化硅粉1~5%,碳粉1~10%,硅溶胶10~20%。
所述的高温合金夹渣过滤网,刚玉粉中,粒度20~80目的刚玉粉占总刚玉粉的40~60%,其余为粒度200~1000目的刚玉粉;二氧化硅粉粒度320目,碳粉粒度320目。
所述的高温合金夹渣过滤网,先将两种粒度的刚玉粉,混合均匀;再加入碳粉,混制均匀;最后加硅溶胶,调和均匀;经过冷静压成型、真空热烧结强化、打磨清理制成过滤网。
所述的高温合金夹渣过滤网,在室温下进行冷静压成型,压力200~800MPa。
所述的高温合金夹渣过滤网,过滤网的高温强度在30~100MPa。
所述的高温合金夹渣过滤网的应用,将过滤网安放到浇注系统中,浇口杯底部中间放置过滤网,过滤网厚度10~50mm,直径30~100mm。
所述的高温合金夹渣过滤网的应用,在铸造工艺下浇注合金液,浇注温度在1350~1550℃之间,浇注时间3~60s。
所述的高温合金夹渣过滤网的应用,该过滤网适用于所有金属材料的铸造过程,特别适用于高温浇注过程。
本发明的设计思想是:
夹渣去除成为二次重熔浇注的产品首要问题,尤其超高温浇注时,一般过滤网,如:氧化镁质、石墨质的强度、承温能力和抗热冲蚀性能都不够。本发明的过滤网是一种高温稳定性强的过滤网,能够解决超高温浇注过程的夹渣问题。
本发明的优点及有益效果是:
1.本发明可以直接应用于生产实际,具有很大的实用性和可控性,有利于提高零件的质量和性能。
2.本发明应用于所有能流动的合金液体材料的精密铸造,特别适用于高温浇注过程。
附图说明:
图1为不用过滤网的铸件中夹渣的形貌图。
具体实施方式:
在具体实施过程中,本发明高温合金夹渣过滤网和应用如下:
首先,选择过滤网原材料为刚玉粉、二氧化硅粉、碳粉和硅溶胶等,按质量百分比计,刚玉粉含量等于或大于80%、二氧化硅粉小于或等于5%、碳粉小于或等于10%、硅溶胶等于或大于10%;刚玉粉中,粒度20~80目的刚玉粉占总刚玉粉的40~60%,其余为粒度200~1000目的刚玉粉,采用两种粒度的刚玉粉作用是为了降低过滤网的成本;二氧化硅粉粒度320目,碳粉粒度320目。
然后,将两种粒度的刚玉粉混合均匀;加入碳粉,混制均匀;加硅溶胶调和均匀。在室温、压力200~800MPa条件下,经过冷静压成型、真空热烧结强化、打磨清理等步骤制成过滤网,过滤网在1500~1650℃的高温强度在30~100MPa。在应用过滤网时,把过滤网安放到浇注系统中,如:浇口杯底部中间放置过滤网,过滤网厚度10~50mm,直径30~100mm。
最后,在铸造工艺下浇注合金液,浇注温度在1350~1550℃之间,浇注时间3~60s,冷却后,检验O、N和S成分,对比浇注合金液,验证过滤网的有效性。
下面,通过实施例和附图对本发明进一步详细阐述。
实施例1
本实施例中,高温合金牌号为K465,高温合金夹渣过滤网的制备过程如下:
选择过滤网原材料为刚玉粉、二氧化硅粉、碳粉和硅溶胶等,其中:刚玉粉含量85%、二氧化硅粉2%、碳粉2%、硅溶胶11%(质量百分比);刚玉粉中,粒度20~80目的刚玉粉占总刚玉粉的40wt%,其余为粒度200~1000目的刚玉粉;二氧化硅粉粒度320目,碳粉粒度320目。
将两种粒度的刚玉粉混合均匀;加入碳粉,混制均匀;加硅溶胶调和均匀。在室温、压力200MPa条件下,经过冷静压成型、真空热烧结强化、打磨清理等步骤制成高温强度在80MPa的过滤网,把过滤网安放到浇注系统中。在相同铸造工艺下,向加过滤网和不加过滤网的型壳中浇注合金液,浇注温度都在1550℃,浇注时间都是3s,冷却。检验O、N和S成分。
实施结果显示:不用过滤网的铸件中含有较多夹渣,见图1,O、N和S含量低;应用过滤网的铸件中夹渣很少,O、N和S含量高,见表1。
表1实施例1不用过滤网和使用过滤网的铸件中O、N和S含量对比
元素 O N S
质量百分含量%(不加过滤网的) 0.04 0.0015 0.008
质量百分含量%(加过滤网的) 0.002 0.0008 0.003
实施例2
本实施例中,高温合金牌号为K418,高温合金夹渣过滤网的制备过程如下:
选择过滤网原材料为刚玉粉、二氧化硅粉、碳粉和硅溶胶等,其中,刚玉粉含量80%、二氧化硅粉3%、碳粉5%、硅溶胶12%(质量百分比);刚玉粉中,粒度20~80目的刚玉粉占总刚玉粉的50wt%,其余为粒度200~1000目的刚玉粉;二氧化硅粉粒度320目,钨粉粒度320目。
将两种粒度的刚玉粉混合均匀;加入碳粉,混制均匀;加硅溶胶调和均匀。在室温、压力600MPa条件下,经过冷静压成型、真空热烧结强化、打磨清理等步骤制成高温强度在60MPa的过滤网,把过滤网安放到浇注系统中。在相同铸造工艺下,向加过滤网和不加过滤网的型壳中浇注合金液,浇注温度都在1450℃,浇注时间都是35s,冷却。检验O、N和S成分。
实施结果显示:不用过滤网的铸件中含有较多夹渣,O、N和S含量低;应用过滤网的铸件中夹渣很少,O、N和S含量高,见表2。
表2实施例2不用过滤网和使用过滤网的铸件中O、N和S含量对比
元素 O N S
质量百分含量%(不加过滤网的) 0.065 0.0085 0.08
质量百分含量%(加过滤网的) 0.002 0.0022 0.0096
实施例结果表明,本发明高温合金夹渣过滤网和应用,不仅提高铸件质量和性能水平,而且显著地缩短制造周期,降低成本,具有长远的应用前景和较高的经济效益。因此,适用于所有金属材料的铸造过程,特别适用于金属材料的高温浇注过程。

Claims (8)

1.一种高温合金夹渣过滤网,其特征在于,选择过滤网原材料为刚玉粉、二氧化硅粉、碳粉和硅溶胶,按质量百分比计,刚玉粉含量80~90%,二氧化硅粉1~5%,碳粉1~10%,硅溶胶10~20%。
2.按照权利要求1所述的高温合金夹渣过滤网,其特征在于,刚玉粉中,粒度20~80目的刚玉粉占总刚玉粉的40~60%,其余为粒度200~1000目的刚玉粉;二氧化硅粉粒度320目,碳粉粒度320目。
3.按照权利要求2所述的高温合金夹渣过滤网,其特征在于,先将两种粒度的刚玉粉,混合均匀;再加入碳粉,混制均匀;最后加硅溶胶,调和均匀;经过冷静压成型、真空热烧结强化、打磨清理制成过滤网。
4.按照权利要求3所述的高温合金夹渣过滤网,其特征在于,在室温下进行冷静压成型,压力200~800MPa。
5.按照权利要求3所述的高温合金夹渣过滤网,其特征在于,过滤网的高温强度在30~100MPa。
6.一种权利要求1至5之一所述的高温合金夹渣过滤网的应用,其特征在于,将过滤网安放到浇注系统中,浇口杯底部中间放置过滤网,过滤网厚度10~50mm,直径30~100mm。
7.按照权利要求6所述的高温合金夹渣过滤网的应用,其特征在于,在铸造工艺下浇注合金液,浇注温度在1350~1550℃之间,浇注时间3~60s。
8.按照权利要求6所述的高温合金夹渣过滤网的应用,其特征在于,该过滤网适用于所有金属材料的铸造过程,特别适用于高温浇注过程。
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CN105665617A (zh) * 2014-11-18 2016-06-15 中国科学院金属研究所 一种陶瓷型芯用粘接剂、制备方法及其应用
CN110465625A (zh) * 2019-09-11 2019-11-19 中国科学院金属研究所 一种改善高温合金定向凝固铸件物理粘砂的陶瓷型壳制备方法

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