CN109226959B - 一种纤维增强金属基复合板材及其预处理方法 - Google Patents
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Abstract
本发明公开了一种纤维增强金属基复合板材及其预处理方法,具有包括增强纤维和金属基体材料交替堆垛的多层复合结构;其中,增强纤维为具有微网眼编织结构的碳纤维布或玻璃纤维布,金属基体材料为厚度为1‑3mm的轻质金属材料。采用包括等间隔点焊、直线轨迹焊接、圆轨迹焊接或螺旋轨迹焊接中一种的飞秒/皮秒激光焊接,工艺参数为:激光斑束直径为2‑100μm,激光功率为0.1‑4kW,焊接速度为10‑80mm/min,焊接电流为50‑200A,利用飞秒/皮秒激光的窄光斑、非线性高吸收率及高穿透性,实现被纤维隔离的双金属薄板通过纤维微孔处的焊接冶金结合,制得高强度的纤维增强金属基复合板。
Description
技术领域
本发明属于金属材料加工技术领域,具体涉及一种纤维增强金属基复合板材及其预处理方法。
背景技术
日益增长的工程技术水平对材料性能的要求越来越高,为了提高材料的强度和塑性,从传统的钢铁复合材料到铝镁轻金属复合板,再到纤维增强金属基复合板,逐步实现了具有高强度、高塑性和低重量的复合材料,从而满足工程领域的应用,特别是在汽车和航空航天领域。
但是,纤维增强金属基复合板的制备技术尚不成熟,主要原因是熔点较高,各种复合工艺均需加热到较高温度进行材料软化和扩散,同时需要较大的外加载荷致使界面牢固结合,而目前的纤维材料主要为碳纤维和玻璃纤维,碳纤维虽具有较高的强度,但不耐高温,在高温状态下易氧化,玻璃纤维在承受较大径向力时也易碎化,限制了纤维与金属基之间的复合。为了克服上述困难,一般将碳纤维镀膜放置于真空中进行热压或热轧制备纤维增强金属基复合板,但增加了制备成本和工艺周期,由此带来的繁琐工序也增加复合板性能在工业生产中的不确定性。
发明内容
针对现有技术的上述不足,本发明所要解决的问题是提供一种纤维增强金属基复合板材及其预处理方法,利用飞秒/皮秒激光的窄光斑、非线性高吸收率及高穿透性,实现被纤维隔离的双金属薄板通过纤维微孔处的焊接冶金结合,制备具有高强度的纤维增强金属基复合板。
本发明的上述目的通过以下技术方案予以实现:
第一方面,纤维增强金属基复合板材,具有包括增强纤维和金属基体材料交替堆垛的多层复合结构;其中,
所述增强纤维为具有微网眼编织结构的碳纤维布或玻璃纤维布;所述金属基体材料为厚度为1-3mm的轻质金属材料。
优选的,所述轻质金属材料包括铝合金和/或镁合金。
优选的,所述纤维增强金属基复合板材的结构为五层复合结构,自下而上依次为铝合金、增强纤维、镁合金、增强纤维和铝合金。
第二方面,上述纤维增强金属基复合板材的预处理方法,包括以下步骤:
(1)分别对铝合金板和镁合金板进行包括去氧化皮打磨和清洗的表面处理;
(2)将步骤(1)处理后的板材按照自下而上依次为铝合金、增强纤维、镁合金装配并固定,经所述铝合金一侧进行飞秒/皮秒激光焊接,所述激光焊接的工艺参数包括:
激光斑束直径为2-100μm,激光功率为0.1-4kW,焊接速度为10-80mm/min,焊接电流为50-200A;
(3)将步骤(2)激光焊接后的复合板所述镁合金一侧依次与同步骤(2)相同的增强纤维和铝合金装配并固定,经所述铝合金一侧进行飞秒/皮秒激光焊接,所述激光焊接工艺与同步骤(2)相同,即得。
优选的,所述飞秒/皮秒激光焊接的方式包括等间隔点焊、直线轨迹焊接、圆轨迹焊接或螺旋轨迹焊接中的一种。
本发明的有益效果在于:
1、本专利采用金属/纤维/金属复合结构,利用纤维将金属薄板隔离开来,通过金属与具有高强高韧的纤维材料复合,提高复合材料的整体力学性能;利用飞秒/皮秒激光的窄光斑、非线性高吸收率及高穿透性等特点,实现被纤维隔离的双金属薄板透过纤维布微孔进行焊接冶金结合,同时不会对纤维材料产生任何损伤。
2、相比于传统的激光焊接工艺,由于其相对光斑较大,相对功率较低,熔宽和熔深比较大,导致其焊接热影响区较大,材料损伤较为严重,特别是铝合金,不适合进行精加工或纳米/亚微米尺度加工,进一步导致复合板下层纤维材料损伤严重。本发明采用飞秒/皮秒激光技术,具有高峰值强度、小损伤阈值,光斑直径能达到2μm,由于超短脉冲激光能量被限制在趋肤深度的范围内,而且作用时间极短,能量还没来得及扩散,材料已经被加热到极高温度,在材料内形成很大的温度梯度,使得周围热影响区很小,激光作用范围在亚微米范围内,与超细晶粒尺寸几乎一致,可在晶粒尺寸下进行微加工,并从而不会引起晶粒尺寸长大,从而实现精密加工。
附图说明
图1为纤维复合轻金属材料飞秒激光预处理示意图。
具体实施方式
以下对本发明的原理和特征进行描述,所举实例只用于解释本发明,并非用于限定本发明的范围。
本实例选用厚度均为2mm的7075铝合金板和AZ31B镁合金板,先用砂纸对铝镁合金板表面进行打磨以去除氧化膜,用无水乙醇对板子表面进行清洗并吹干。
如图1所示,将处理后的板材按照自下而上依次为铝合金、增强纤维、镁合金装配并固定,经铝合金一侧进行飞秒/皮秒激光焊接,激光焊接的工艺参数为:激光斑束直径为2-100μm,激光功率为0.1-4kW,焊接速度为10-80mm/min,焊接电流为50-200A。
将激光焊接后的复合板镁合金一侧依次与同上述操作相同的增强纤维和铝合金装配并固定,经铝合金一侧进行飞秒/皮秒激光焊接,激光焊接工艺与同上述操作,即得五层复合结构的纤维增强金属基复合板材。
在另一实例中,与上述实例的飞秒/皮秒激光焊接方法相同,不同之处在于选用厚度均为1mm的7075铝合金板和AZ31B镁合金板。
在另一实例中,与上述实例的飞秒/皮秒激光焊接方法相同,不同之处在于选用厚度均为3mm的7075铝合金板和AZ31B镁合金板。
在另一实例中,与上述实例的飞秒/皮秒激光焊接方法和工艺相同,不同之处在于采用等间隔点焊方式。
在另一实例中,与上述实例的飞秒/皮秒激光焊接方法和工艺相同,不同之处在于采用直线轨迹焊接方式。
在另一实例中,与上述实例的飞秒/皮秒激光焊接方法和工艺相同,不同之处在于采用圆轨迹焊接方式。
在另一实例中,与上述实例的飞秒/皮秒激光焊接方法和工艺相同,不同之处在于采用螺旋轨迹焊接方式。
以上所述内容,仅是本发明的较佳实验实例结果而已,并非对本发明作任何形式上的限制,故凡是未脱离本发明技术方案内容,依据本发明的技术实质对以上实施例所作的任何修改、等同变化与修饰,均仍属于本发明权利要求书所限定技术方案的范围内。
Claims (3)
1.纤维增强金属基复合板材,其特征在于,具有包括增强纤维和金属基体材料交替堆垛的多层复合结构;其中,:
所述增强纤维为具有微网眼编织结构的碳纤维布或玻璃纤维布;
所述金属基体材料为厚度1-3mm的轻质金属材料;
所述轻质金属材料为铝合金和镁合金;
所述纤维增强金属基复合板材的预处理方法包括以下步骤:
(1)分别对铝合金板和镁合金板进行包括去氧化皮打磨和清洗的表面处理;
(2)将步骤(1)处理后的板材按照自下而上依次为铝合金、增强纤维、镁合金装配固定,经所述铝合金一侧进行飞秒/皮秒激光焊接,工艺参数包括:激光斑束直径为2-100μm,激光功率为0.1-4kW,焊接速度为10-80mm/min,焊接电流为50-200A;
(3)将步骤(2)激光焊接后的复合板所述镁合金一侧依次与同步骤(2)相同的增强纤维和铝合金装配固定,经所述铝合金一侧进行飞秒/皮秒激光焊接,所述激光焊接工艺与步骤(2)相同。
2.根据权利要求1所述的纤维增强金属基复合板材,其特征在于,所述纤维增强金属基复合板材的结构为五层复合结构,自下而上依次为铝合金、增强纤维、镁合金、增强纤维和铝合金。
3.根据权利要求1所述的纤维增强金属基复合板材,其特征在于,所述飞秒/皮秒激光焊接方式包括等间隔点焊、直线轨迹焊接、圆轨迹焊接或螺旋轨迹焊接中的一种。
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