CN116565275A - 一种平板式sofc阳极支撑体及其坯体的成型方法、系统 - Google Patents
一种平板式sofc阳极支撑体及其坯体的成型方法、系统 Download PDFInfo
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Abstract
本发明公开了一种平板式SOFC阳极支撑体及其坯体的成型方法、系统,包括以下步骤:将陶瓷泥料通过陶瓷挤管机挤出,在挤出过程中,将坯体沿轴向切割,得到片状坯体;将所述片状坯体两两交叉叠加,得到待轧坯体,其中,所述片状坯体的交叉角度为90°;将所述待轧坯体置于轧膜机的轧辊间进行轧膜,得到轧制膜带;将所述轧制膜带冲压成型,即得阳极支撑体坯体。本发明制备的阳极支撑体收缩率低,不易开裂,进而固体氧化物燃料电池的安全性高,使用寿命长。
Description
技术领域
本发明属于固体氧化物燃料电池技术领域,具体涉及一种平板式SOFC阳极支撑体及其坯体的成型方法、系统。
背景技术
气候变暖已经成为人类社会广泛研究和关注的全球性环境问题,减少CO2等温室气体排放是解决全球气候变暖的有效途径,而减少CO2等温室气体排放则需要大力发展氢能等清洁能源。固体氧化物燃料电池(Solid oxide fuel cell,SOFC)是一种将化学能转化为电能的高效能源转化装置,具有能源转换效率高(突破了卡诺循环的限制,其热效率高达85%)、环境无污染、噪音低等优点,SOFC技术成为构建“氢能社会”重要的技术支撑,已经在工业电站、汽车电源和便携式电源设备等领域取得了实际应用。
SOFC主要有平板式和管式两种结构类型,其中平板式SOFC由于具备更高的功率密度,而且易于构建电池堆,串联使用可以满足大功率输出的需求,因此获得了广泛研究。平板式SOFC现主要采用流延成型法制备阳极支撑体,具有设备简单、生产效率高等优点,但流延成型浆料中粘结剂含量高,烘干和烧成的收缩率可达20%-21%,过高的收缩率导致流延成型的坯体在干燥和烧成的过程中易开裂,造成产品失效。
发明内容
针对上述问题,本发明提供了一种平板式SOFC阳极支撑体及其坯体的成型方法、系统,采用挤出成型工艺制备阳极支撑体,进而制得安全可靠的平板式固体氧化物燃料电池。
首先,本发明提供了一种平板式SOFC阳极支撑体坯体的成型方法,包括以下步骤:将陶瓷泥料通过陶瓷挤管机挤出,在挤出过程中,将坯体沿轴向切割,得到片状坯体;将所述片状坯体两两交叉叠加,得到待轧坯体,其中,所述片状坯体的交叉角度为90°;将所述待轧坯体置于轧膜机的轧辊间进行轧膜,得到轧制膜带;将所述轧制膜带冲压成型,即得阳极支撑体坯体。
优选的,对所述待轧坯体进行至少两次轧膜,每次轧膜后,将所述轧制膜带旋转90°后再进行下一次轧膜。
优选的,所述陶瓷泥料通过以下步骤制得:将NiO-YSZ粉体、助剂、水混合,将混合后得到的浆料进行球磨、造粒,得到造粒颗粒;将所述造粒颗粒置入练泥机中进行练泥,即可得到陶瓷泥料。
优选的,所述NiO-YSZ粉体的粒径为0.2-1.0μm。
优选的,所述造粒颗粒的含水量为10wt%~30wt%。
其次,本发明还提供一种平板式SOFC阳极支撑体坯体的成型系统,包括:挤出单元,用于将陶瓷泥料通过陶瓷挤管机挤出,在挤出过程中,将坯体沿轴向切割,得到片状坯体;叠坯单元,用于接收所述片状坯体,并将所述片状坯体两两交叉叠加,得到待轧坯体,其中,所述片状坯体的交叉角度为90°;轧膜单元,用于接收所述待轧坯体,并将所述待轧坯体置于轧膜机的轧辊间进行轧膜,得到轧制膜带;冲压单元,用于接收所述轧制膜带,并将所述轧制膜带冲压成型,得到阳极支撑体坯体。
优选的,所述陶瓷挤管机包括陶瓷管挤出模具,所述陶瓷管挤出模具包括模芯和模套,所述模芯和模套之间设有切割件。
优选的,所述切割件为金刚石丝。
优选的,所述切割件位于所述陶瓷管挤出模具的出口处。
优选的,所述轧膜单元包括膜带转移模块,所述膜带转移模块可将轧制膜带从轧膜机的出料口转移至进料口。
再次,本发明还提供一种平板式SOFC阳极支撑体,由上述制得的阳极支撑体坯体排胶、烧结得到。
与现有技术相比,本发明具有以下有益效果:
首先,由于流延成型工艺本身对浆料流动性要求较高,用于流延成型的浆料中除陶瓷粉体之外的其他试剂(比如粘结剂、分散剂等助剂以及水)的含量高,导致坯体烘干、烧成的收缩率高,容易开裂。故本发明采用挤出成型法制备阳极支撑体,用于挤出成型法的泥料中其他试剂的含量远低于流延成型浆料中其他试剂的含量,因此,本发明制得的坯体烘干和烧成的收缩率低,不易开裂,进而制得的固体氧化物燃料电池合格率高、安全性高,使用寿命长。
其次,由于泥料在挤出平板的过程中受力不均匀,模具边缘的泥料受压应力和摩擦力影响,出泥速度较慢,而中间位置的泥料受轴向压力的影响,挤出速度快,出泥速度不一致,导致坯体密度不均匀。而用于制备薄壁陶瓷管的工艺过程中,由于管坯各部分受力均匀,不存在陶瓷挤出平板时各部分受力不均匀的问题。故本发明采用挤出法制备阳极支撑体时,没有直接挤出平板状坯体,而是对陶瓷管挤出模具进行了改进,具体的,在陶瓷管挤出模具上设置切割件,通过切割件可以在圆管坯体挤出的过程中将圆管坯体切割成片状坯体。
再次,又由于泥料在三向应力的作用下,粉体沿挤出方向定向排列,坯体在干燥和烧结过程中,垂直于挤出方向的收缩大于沿挤出方向的收缩,干燥、烧结的过程中坯体易开裂。故本发明将挤出得到的片状坯体两两交错叠加,然后进行轧膜、冲压,最终制得密度均匀的阳极支撑体坯体。
因此,本发明可以避免阳极支撑体产生内应力,阳极支撑体的密度均匀、不易开裂,避免电堆工作中阳极支撑体开裂导致的气体泄漏等安全隐患。同时,本发明还设计了成型系统,以便实现阳极支撑体坯体成型的自动化操作,减少人工操作,降低劳动强度。
附图说明
图1为本发明实施例1中一种制备平板式SOFC阳极支撑体坯体的流程图;
图2为本发明实施例1中一种陶瓷管挤出模具的结构示意图;
图3为本发明实施例1的一种片状坯体中粉体的排列示意图;
图4为本发明实施例1的一种待轧坯体中粉体的排列示意图;
图5为本发明实施例1中一种轧膜机的结构示意图。
1-陶瓷管挤出模具,10-模芯,11-模套,12-切割件,A-挤出方向,21-片状坯体,22-待轧坯体,3-轧膜机,31-轧辊,32-真空吸盘机械手。
具体实施方式
下面将对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明的一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其它实施例,都属于本发明保护的范围。
实施例1
本实施例提供了一种平板式SOFC阳极支撑体坯体的成型方法,包括以下步骤:
S1、制备陶瓷泥料。
具体的,将NiO-YSZ粉体、助剂、水混合,将混合后得到的浆料进行球磨、造粒,得到含水量为10wt%-30wt%的造粒颗粒;将所述造粒颗粒置入练泥机中进行练泥,即可得到陶瓷泥料。所述陶瓷泥料中NiO-YSZ粉体的含量为50wt%-70wt%。
其中,所述NiO-YSZ粉体的粒径为0.2-1.0μm,优选为3-8YSZ。
所述助剂包括粘结剂,所述粘结剂选自聚乙烯醇、硅酸丁酯、醋酸乙烯树脂、羟丙基甲基纤维素中的一种或多种。
所述助剂包括分散剂,所述分散剂选自聚丙烯酸铵、聚丙烯酸中的一种或两种。
所述助剂包括造孔剂,所述选自炭粉、可溶性淀粉、石墨粉中的一种或多种。
本实施例作为一种优选方案,所述助剂还包括塑化剂,比如桐油、大豆油中的一种或两种。
本实施例作为一种优选方案,所述助剂还包括保水剂,比如甘油、氯化铵中的一种或两种。
S2、将陶瓷泥料通过陶瓷挤管机挤出,在挤出过程中,将坯体沿轴向切割,得到片状坯体。
具体的,所述陶瓷挤管机包括陶瓷管挤出模具,所述陶瓷管挤出模具包括模芯和模套,所述模芯和模套之间设有切割件。所述切割件为金刚石丝,所述切割件位于所述陶瓷管挤出模具的出口处。切割件可以对管状坯体进行轴向切割,使得管状坯体挤出时,即被切割成片状坯体。
根据实际需要,当挤出的坯体达到一定长度时,采用气动切割刀进行切割,即可得到所需长度的片状坯体,将得到的片状坯体置于接坯机上以进行下一步工序即可。本实施例作为一种优选方案,所述片状坯体为正方形坯体,即所述片状坯体的长、宽相等。
S3、将所述片状坯体两两以90°的交叉角度进行交叉叠加,得到待轧坯体。
具体的,采用真空吸盘机械手将接坯机上的片状坯体吸起,在气缸的作用下,真空吸盘机械手上升离开接坯机,与接坯机保持一定距离;在旋转电机的作用下,真空吸盘机械手旋转90°,被吸起的片状坯体随之旋转90°;待下一块片状坯体切割完后到达接坯机后,控制真空吸盘机械手下降,将被吸起的旋转后的片状坯体置于接坯机上的片状坯体上表面,即可实现片状坯体的两两叠加,得到待轧坯体。
S4、将所述待轧坯体置于轧膜机的轧辊间进行轧膜,得到轧制膜带。
本实施例作为一种优选方案,对所述待轧坯体进行至少两次轧膜,每次轧膜后,将所述轧制膜带旋转90°后再进行下一次轧膜。
具体的,设置真空吸盘机械手,真空吸盘机械手可以在轧膜机的出料口和进料口之间往复,用于将轧膜机出料口处的轧制膜带转移至进料口,以进行下一次的轧膜。
需要说明的是,真空吸盘机械手可旋转,也就可以带动被吸起的膜带旋转;每次轧膜时,轧辊间的间隙可以不同,优选的,逐次缩小压辊间的间隙,以得到厚度符合要求的膜带。
S5、将所述轧制膜带冲压成型,即得阳极支撑体坯体。生坯片的形状和尺寸,根据所需阳极支撑体的形状和尺寸确定。
本实施例还提供了一种平板式SOFC阳极支撑体坯体的成型系统,包括:
挤出单元,用于将陶瓷泥料通过陶瓷挤管机挤出,在挤出过程中,将坯体沿轴向切割,得到片状坯体。所述陶瓷挤管机包括陶瓷管挤出模具,所述陶瓷管挤出模具包括模芯和模套,所述模芯和模套之间设有切割件。所述切割件为金刚石丝,所述切割件位于所述陶瓷管挤出模具的出口处。
叠坯单元,用于接收所述片状坯体,并将所述片状坯体两两交叉叠加,得到待轧坯体,其中,所述片状坯体的交叉角度为90°。
轧膜单元,用于接收所述待轧坯体,并将所述待轧坯体置于轧膜机的轧辊间进行轧膜,得到轧制膜带。本实施例作为一种优选方案,所述轧膜单元包括膜带转移模块,所述膜带转移模块可将轧制膜带由轧膜机的出料口转移至进料口。
冲压单元,用于接收所述轧制膜带,并将所述轧制膜带冲压成型,得到阳极支撑体坯体。
本实施例还提供一种平板式SOFC阳极支撑体,由上述制得的阳极支撑体坯体排胶、烧结得到,烧结温度为1000-1200℃,优选为1100℃。
以上各实施例仅用以说明本发明的技术方案,而非对其限制;尽管参照前述各实施例对本发明进行了详细的说明,本领域的普通技术人员依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分或者全部技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本发明各实施例技术方案的范围,其均应涵盖在本发明的权利要求和说明书的范围当中。
Claims (10)
1.一种平板式SOFC阳极支撑体坯体的成型方法,其特征在于,包括以下步骤:
将陶瓷泥料通过陶瓷挤管机挤出,在挤出过程中,将坯体沿轴向切割,得到片状坯体;
将所述片状坯体两两交叉叠加,得到待轧坯体,其中,所述片状坯体的交叉角度为90°;
将所述待轧坯体置于轧膜机的轧辊间进行轧膜,得到轧制膜带;
将所述轧制膜带冲压成型,即得阳极支撑体坯体。
2.根据权利要求1所述的平板式SOFC阳极支撑体坯体的成型方法,其特征在于,对所述待轧坯体进行至少两次轧膜,每次轧膜后,将所述轧制膜带旋转90°后再进行下一次轧膜。
3.根据权利要求1所述的平板式SOFC阳极支撑体坯体的成型方法,其特征在于,所述陶瓷泥料通过以下步骤制得:
将NiO-YSZ粉体、助剂、水混合,将混合后得到的浆料进行球磨、造粒,得到造粒颗粒;
将所述造粒颗粒置入练泥机中进行练泥,即可得到陶瓷泥料。
4.根据权利要求3所述的平板式SOFC阳极支撑体坯体的成型方法,其特征在于,所述NiO-YSZ粉体的粒径为0.2-1.0μm。
5.根据权利要求3所述的平板式SOFC阳极支撑体坯体的成型方法,其特征在于,所述造粒颗粒的含水量为10wt%~30wt%。
6.一种平板式SOFC阳极支撑体坯体的成型系统,其特征在于,包括:
挤出单元,用于将陶瓷泥料通过陶瓷挤管机挤出,在挤出过程中,将坯体沿轴向切割,得到片状坯体;
叠坯单元,用于接收所述片状坯体,并将所述片状坯体两两交叉叠加,得到待轧坯体,其中,所述片状坯体的交叉角度为90°;
轧膜单元,用于接收所述待轧坯体,并将所述待轧坯体置于轧膜机的轧辊间进行轧膜,得到轧制膜带;
冲压单元,用于接收所述轧制膜带,并将所述轧制膜带冲压成型,得到阳极支撑体坯体。
7.根据权利要求6所述的平板式SOFC阳极支撑体坯体的成型系统,其特征在于,所述陶瓷挤管机包括陶瓷管挤出模具,所述陶瓷管挤出模具包括模芯和模套,所述模芯和模套之间设有切割件。
8.根据权利要求7所述的平板式SOFC阳极支撑体坯体的成型系统,其特征在于,所述切割件为金刚石丝,和/或,所述切割件位于所述陶瓷管挤出模具的出口处。
9.根据权利要求6所述的平板式SOFC阳极支撑体坯体的成型系统,其特征在于,所述轧膜单元包括膜带转移模块,所述膜带转移模块可将轧制膜带从轧膜机的出料口转移至进料口。
10.一种平板式SOFC阳极支撑体,其特征在于,由权利要求1~9中任一项制得的阳极支撑体坯体排胶、烧结得到。
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