CN113278932B - 一种扩散焊接型AlSc合金靶材的一次成型制备方法 - Google Patents

一种扩散焊接型AlSc合金靶材的一次成型制备方法 Download PDF

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CN113278932B
CN113278932B CN202011617741.6A CN202011617741A CN113278932B CN 113278932 B CN113278932 B CN 113278932B CN 202011617741 A CN202011617741 A CN 202011617741A CN 113278932 B CN113278932 B CN 113278932B
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曹晓萌
丁照崇
李勇军
贾倩
李利利
曲鹏
杜文路
陈明
熊晓东
庞欣
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Youyan Yijin New Material Co Ltd
Youyan Yijin New Material Shandong Co ltd
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Abstract

本发明公开了属于磁控溅射靶材制造技术领域的一种扩散焊接型AlSc合金靶材的一次成型制备方法。本发明公开的扩散焊接型AlSc合金靶材的制备方法,采用熔炼工艺成型,将配比好的合金熔液直接浇注在焊接面有燕尾槽并加镀层的背板上,另外一面通冷却水冷却,通过背板燕尾槽的结构设计,实现靶材近尺寸成型及与背板扩散焊接一体成型,最终AlSc合金靶材的焊合率≥99%,焊接强度≥10MPa。通过浇注一次成型扩散焊接靶材,减少繁琐的靶面成型及热等静压扩散焊接,大大降低成本,并利用背板焊接面加镀层,防止焊接面生成脆性相,得到焊接强度满足使用要求的产品。

Description

一种扩散焊接型AlSc合金靶材的一次成型制备方法
技术领域
本发明属于磁控溅射靶材制造技术领域,尤其涉及一种扩散焊接型AlSc合金靶材的一次成型制备方法。
背景技术
伴随高频移动通信(5G)、物联网时代的到来,超越摩尔定律的新兴半导体技术日新月异,其中MEMS器件在国防安全、工业智能和智能生活等领域均拥有巨大的应用市场。基于压电效应的射频滤波器、传感器、换能器等是急需重点发展的关键半导体器件。为满足器件的高频、大带宽、小型化、集成化需求,具有高机电耦合系数并且与当前集成电路工艺高度兼容的AlScN薄膜是新一代压电MEMS器件的核心。高纯AlSc稀土合金靶材主要用于溅射高纯AlScN薄膜,相比AlN、ZnO、锆钛酸铅(PZT)等现有压电薄膜,其具有更强更优的压电性能,是高频移动通信(5G)射频滤波器芯片、MEMS微型先进传感器等制造核心材料。
传统工艺制备复合AlSc合金靶材需要先制备AlSc合金靶坯,然后通过钎焊或扩散焊接实现靶材与背板的结合。AlSc靶坯本身性质较脆,热机械处理容易产生裂纹,后续焊接过程,钎焊工艺采用In焊接得到的复合靶材强度较低,不适合大功率溅射。而热扩散焊接需要制作包套,在热等静压炉中进行,采用高压长时间的工艺,也容易使脆性靶材产生裂纹,并且扩散焊接的热等静压炉设备造价高,工艺复杂。
发明内容
针对上述问题,本发明提出了一种扩散焊接型AlSc合金靶材的一次成型制备方法,包括以下步骤:
1)选择铝金属原料和钪金属原料,按照合金配比进行熔炼,得到熔融合金液;
2)在背板焊接面加工出浇注槽,浇注槽内加工出燕尾槽;
3)在背板焊接面上加镀层;
4)将熔融合金液直接浇注在焊接面有燕尾槽的浇注槽内,背板另一面通冷却水冷却,实现靶材近尺寸成型及与背板扩散焊接一体成型;
所述AlSc合金靶材焊合率≥99%,焊接强度≥10MPa。
所述AlSc合金中Sc含量为0-40at%。
所述合金背板包括Cu合金背板、Mo背板等,具体包括,CuCr合金、CuZnSn合金、CuZn合金。
所述燕尾槽尺寸深度为0.1-1mm,上开口宽度为1-5mm,侧壁与底面角度为70°,燕尾槽上边间距为1-10mm。
背板厚度为10-30mm,加工出浇注槽,浇注槽深为5-10mm。
镀层方式为化学镀或磁控溅射,镀层材质为Ni或NiV,化学镀得到的厚度为5-20um,磁控溅射得到的镀层厚度为100-2000nm。
本发明的有益效果在于:
1.AlSc合金靶材采用熔炼工艺成型,快速浇注在焊接面有燕尾槽的合金背板上,能够实现背板和靶面一次成型,工艺简单,大大降低成本。
2.本发明利用燕尾槽的特殊结构设计,并在焊接面加Ni或NiV镀层,防止Al与背板反应生成脆性相,首先能够实现AlSc靶面与背板的机械咬合,防止焊接面开裂,实现高可靠性焊接。
3.本发明所述方法通过在背板焊接面进行化学镀或电镀Ni或NiV,然后进行浇注,实现靶材的高可靠性焊接,避免了Al-Cu进行扩散焊接时易生成脆性中间相的问题,防止了扩散焊接界面脆性中间相生成。
4.为降低焊接靶材工艺的复杂性并保留足够的焊接强度,本发明主要通过设计焊接面的结构,在背板焊接面加入燕尾槽结构,并在焊接面加Ni或NiV镀层,防止Al与背板反应生成脆性相,实现靶材与背板的机械咬合进一步实现原子扩散。AlSc合金溶液直接浇注在焊接面具有燕尾槽的背板上,形成结构上的凹凸部位相结合,即机械咬合,甚至进一步进行原子间扩散,达到较好的焊接强度。
附图说明
图1为本发明AlSc合金靶材制备流程示意图。
图2为焊接面带燕尾槽的背板示意图。
图3为燕尾槽尺寸详细示意图。
图4为浇注成型AlSc合金靶材示意图。
其中,1-背板;2-浇注靶面;3-进水口;4-出水口。
具体实施方式
一种扩散焊接型AlSc合金靶材的一次成型制备方法,包括以下步骤:
1)选择铝原材料和钪原材料,按照所需配比(Sc含量在0-40at%)进行熔炼,得到熔融合金液;
2)将Cu合金或Mo背板1进行机加工,并在焊接面按照燕尾槽尺寸深度为0.1-1mm,宽度为1-5mm,间距为1-10mm进行加工;
3)在背板焊接面进行化学镀或磁控溅射镀Ni或NiV;
4)将铝钪合金溶液直接浇注在焊接面有燕尾槽的Cu合金背板或Mo背板上的浇注槽内,得到浇注靶面2,另一面通冷却水冷却,实现靶材近尺寸成型及与背板扩散焊接一体成型;
5)Al合金或Cu合金背板焊接面的背面通过进水口3和出水口4通冷却水进行冷却;
所述AlSc合金靶材焊合率≥99%,焊接面的焊接强度≥10MPa。
以下结合附图和具体实施例对本发明作进一步的详细说明:
实施例1~4
1、按照如图1所示的流程,进行AlSc靶材制备;准备所需的原材料,Al原材料和Sc原材料;
2、按照0-40at%Sc配比进行熔炼,得到熔融合金液;
3、按照图2及图3进行Mo背板机加工,并在焊接面按照燕尾槽尺寸深度为0.1-1mm,宽度为1-5mm,间距为1-10mm进行加工;
4、在背板焊接面进行化学镀Ni;
5、将铝钪合金溶液直接浇注在焊接面有燕尾槽的Mo背板上,背面通冷却水冷却,实现靶材近尺寸成型及与背板扩散焊接一体成型,如图3。
对比例1
1、准备所需的原材料,Al原材料和Sc原材料;
2、按照15at%Sc配比进行熔炼,得到熔融合金液,在模具中冷却成铸锭;
3、将铸锭进行热机械处理,锻造或轧制;
4、通过机加工得到规定尺寸的AlSc合金靶坯;
5、将Mo背板通过车床机加工,加工成规定尺寸;
6、将AlSc合金靶坯与Mo背板进行钎焊,得到AlSc合金靶材。
对比例2
1、准备所需原材料,Al原材料和Sc原材料;
2、按照15at%Sc配比进行熔炼,得到熔融合金液,在模具中冷却成铸锭。
3、将铸锭进行热机械处理,锻造或轧制;
4、通过机加工得到规定尺寸的AlSc合金靶坯;
5、将Mo背板通过车床机加工,加工成规定尺寸;
6、制作包套,将AlSc合金靶坯与Mo背板装入包套中;
7、将装好包套的靶坯及背板进行除气、封焊。
8、在热等静压炉中进行扩散焊接,得到扩散焊接AlSc合金靶材。
实施例1~3及对比例1、2中AlSc靶材的制备及性能结果见表1。
表1实施例及对比例AlSc靶材的制备及性能
Figure BDA0002871682690000031

Claims (3)

1.一种扩散焊接型AlSc合金靶材的一次成型制备方法,其特征在于,包括以下步骤:
1)选择铝金属原料和钪金属原料,按照合金配比进行熔炼,得到熔融合金液;
2)在背板焊接面加工出浇注槽,浇注槽内加工出燕尾槽;
3)在背板焊接面上加镀层;
4)将熔融合金液直接浇注在焊接面有燕尾槽的浇注槽内,背板另一面通冷却水冷却,实现靶材近尺寸成型及与背板扩散焊接一体成型;
燕尾槽尺寸深度为0.1-1mm,上开口宽度为1-5mm,侧壁与底面角度为70°,燕尾槽上边间距为1-10mm;
背板厚度为10-30mm,浇注槽深为5-10mm;
所述AlSc合金中Sc含量为5-40at%,AlSc合金靶材焊合率≥99%,焊接强度≥10MPa。
2.根据权利要求1所述制备方法,其特征在于,所述合金背板包括Cu合金背板或Mo背板;所述Cu合金背板为CuCr合金、CuZnSn合金或CuZn合金。
3.根据权利要求1所述制备方法,其特征在于,镀层方式为化学镀或磁控溅射,镀层材质为Ni或NiV,化学镀得到的厚度为5-20um,磁控溅射得到的镀层厚度为100-2000nm。
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