CN109572135B - 一种钽钢复合板及其制备方法 - Google Patents
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Abstract
本发明公开了一种钽钢复合板及其制备方法,该钽钢复合板包括钽板层和钢板层,钽板层和钢板层之间形成有扩散层。本发明公开的钽钢复合板制备方法包括以下步骤:选料—表面处理—涂抹隔离剂—焊接钽板—组坯(封焊周边—焊接通气管—气密检验—抽真空—充惰性气体)—加热—轧制—热处理—校平—切边—表面处理—成品复合板材。该方法对生产场地的要求不高,生产效率高,生产成本较低。
Description
技术领域
本发明公开了一种复合材料及其制造方法,具体为一种钽钢复合板及其制备方法。
背景技术
钽是一种高熔点、低蒸气压、热膨胀系数小的稀有难熔金属。由于钽表面极易生成致密稳定的五氧化二钽(Ta2O5)保护膜,表现出非常优异的抗腐蚀性能,无论在冷或者热的状态下,对盐酸、浓硝酸和王水都不反应。钽在常温下,对碱溶液、氯气、溴水、稀硫酸以及其他许多药剂均不起作用。此外,钽及其合金也具有较好的高温强度、优良的加工性能以及良好的焊接性能和热传导性能。鉴于其综合性能良好,钽在电子、化工、航空航天、武器等领域具有广阔的应用前景。尽管钽具有很多优良的性能,但是它在地壳中的资源占有量少,且与其它金属元素共生导致冶炼提取困难,使得价格昂贵,限制其广泛的应用。钽钢复合材是以低成本、加工性能良好的钢板为基体,以耐蚀性优良的钽为复板,既解决了由于钽的价格昂贵限制其使用问题,又发挥了钽在一些强腐蚀恶劣工况下(如高温稀硫酸、盐酸、硝酸等环境下)的优势。
中国实用新型专利(申请号201220472919.7)公布一种采用爆炸焊接制备钽钢复合板的方法。爆炸复合法是利用炸药在所爆炸瞬间产生的巨大能量,将两块金属板加速到极高的速度然后发生急速碰撞从而进行焊接,但是生产噪声大,产生废气污染,对于生产场地要求很高,不适合在城区内生产,复合界面的强度不均,而且无法生产薄板和面积较大的板材,不能满足连续化生产的要求。
热轧复合方法是在复合坯料的再结晶温度以上轧制复合坯料以产生大量的变形,在热与力的综合作用下使异种金属坯料完成复合的方法,热轧设备及工艺简单,工况环境良好,产品尺寸范围广,是未来复合板生产的主要发展方向。
发明内容
发明目的:本发明公开了一种钽钢复合板及其制备方法,该钽钢复合板既能适用于强腐蚀恶劣工况又具有良好的加工性能,且成本相对较低。该钽钢复合板制备方法对场地要求不高,工艺简单,生产效率高,环保不会产生废气。
技术方案:一种钽钢复合板的制备方法,具体包括如下步骤:
(1)准备适当尺寸的钢板、钽板各两块,并将预结合面进行磨抛处理,露出新鲜金属;
(2)在钽板的非结合的一面涂抹隔离剂,并将涂抹面相向放置;
(3)将相向放置的钽板四边边缘密封焊接,并在一角预留一通气孔;将钽板封焊,可防止隔离剂中的化学物质挥发至钽板与钢板之间,影响结合质量;
(4)按照钢板、钽板、钽板、钢板的次序对称叠放组坯;
(5)将钢板四周封焊,在钢板一角设通气孔,并在通气孔位置焊接通气管;
(6)将通气管与三通连接,三通分别与真空泵和惰性气体瓶相连;
(7)打开惰性气体瓶阀门补充惰性气体至0.2MPa,检验钢板封焊的气密性;
(8)关闭惰性气体瓶阀门,打开真空泵阀门,将钢层内压力抽至0.01-0.001MPa;
(9)关闭真空泵阀门,打开惰性气体瓶阀门,补充惰性气体至常压;
(10)重复步骤(8)和(9)反复两次,将钢层空气含量降至0.0001MPa以下;
(11)将板坯加热至1000-1300℃保温15-40min;
(12)经轧机轧制,累计下压量大于80%,反复轧制至尺寸;
(13)退火处理,加热至600-1100℃,保温30-80min;
(14)沿成品板四周,将板坯切割开,得两块板材;
(15)将板材覆层清洗、打磨干净;
(16)得到两块成品钽钢复合板。
有益效果:本发明提供的钽钢复合板既有钽板耐腐蚀性能好的优点又同时具有钢板加工方便且强度较高的优点。本发明提供的钽钢复合板制备方法工艺简单,工况环境良好,产品尺寸范围广,一次成型多个,效率较高。
附图说明
图1为本发明钢板封焊之后的板坯的剖面图;
图2为本发明钢板封焊之后的板坯的俯视图。
具体实施方式
一种钽钢复合板的制备方法,具体包括以下步骤:
1)选择厚度为100mm的碳钢板和厚度为10mm的钽板,并对钽板和钢板的待结合面进行打磨处理,使得待结合表面无氧化层、杂质及空洞,呈现新鲜金属面;
2)配制隔离剂,取目数大于200目的氧化铝粉和聚氯乙烯粉末与水按(2-3):(1-2):100的比例混合并搅拌均匀,并均匀涂抹在钽板的非结合面,厚度为0.3-0.8mm,静止晾干或置于烘箱烘干,烘箱温度不得高于180℃;
3)如图1所示,将钽板涂抹隔离剂5的一面相对放置,并将钽板四周密封焊接并在封焊的一角留有一通气孔;
4)将钽板和钢板待结合表面酒精擦拭干净,将封焊好的钽板对中放置在钢板的结合面上,将另一块钢板叠放在钽板之上,使得钢板与钽板结合面相对放置;组成如图1所示的钢板1、钽板2、钽板2、钢板1对称堆叠型式;
5)沿钢板四周密封焊接,同时在封焊一角预留通气孔,并在通气孔位置焊接Ф22×3mm的通气管6,如图2所示;
6)将通气管与三通连接,三通一端接连接真空机组的阀门,另一端接带有调压阀的瓶装氩气;打开氩气调压阀充压至0.1-0.2MPa,用肥皂水检验板坯焊接气密性,然后关闭氩气阀门,打开真空机组阀门将钢坯空腔内压力抽至0.01-0.001MPa,关闭机组阀门打开氩气阀补充氩至大气压,再次关闭氩气阀门打开机组阀门抽真空至0.01-0.001MPa,充氩气至大气压,缓慢拆掉三通的同时用锡块将通气管塞封上;
7)将复合板加热1000-1300℃,保温15-40min,采用轧机压延复合,第一道变形率不得低于20%,经多次轧制总变形率为70%-90%,终轧温度不低于900℃,空冷至常温得到复合板;
8)将复合板加热至600-1100℃,保温30-80min,进行退火处理,板坯校平;
9)切除板料头、尾和两侧焊接部分,清除隔离层,清洗板面,即可得到两张结合性能良好的钽钢复合板。
根据上述钽钢复合板制备方法制作的钽钢复合板包括钽板层和钢板层,钽板层和钢板层的结合界面处形成扩散层,使得钽板与钢板相结合最终形成钽钢复合板。该扩散层中包括钽原子与铁原子扩散形成的固溶体以及原子结合后形成的金属间化合物相。
Claims (8)
1.一种钽钢复合板,包括钽板层和钢板层,其特征在于:所述钽板层和钢板层结合界面处存在扩散层,所述扩散层包括钽板层与钢板层之间的原子互扩散以及原子结合后形成的金属间化合物相;
所述钽钢复合板的制备方法包括如下步骤:
步骤(1)准备钢板、钽板各两块,并将预结合面进行磨抛处理,露出新鲜金属;
步骤(2)在钽板的非结合的一面涂抹隔离剂,并将涂抹面相向放置;
步骤(3)按照钢板、钽板、钽板、钢板的次序对称叠放组坯;
步骤(4)将钢板四周封焊,在钢板一角设通气孔,并在通气孔位置焊接通气管;
步骤(5)将通气管与三通连接,三通分别与真空泵和惰性气体瓶相连;
步骤(6)检验钢板封焊的气密性;
步骤(7)将钢板层空气含量降至0.0001MPa以下;
步骤(8)将板坯加热至1000-1300℃保温15-40min;
步骤(9)板坯经轧机轧制,反复轧制至需要的尺寸;
步骤(10)沿成品板四周,将板坯切割开,得两块板材。
2.根据权利要求1所述的钽钢复合板,其特征在于:所述扩散层中包括钽原子与铁原子扩散形成的固溶体以及原子结合后形成的金属间化合物相。
3.根据权利要求1所述的一种钽钢复合板,其特征在于:所述步骤(2)将钽板涂抹面相向放置之后,将相向放置的钽板四边边缘密封焊接,并在一角预留一通气孔。
4.根据权利要求1所述的一种钽钢复合板,其特征在于:所述步骤(6)中通过打开惰性气体瓶阀门补充惰性气体至0.2MPa,检验钢板封焊的气密性。
5.根据权利要求1所述的一种钽钢复合板,其特征在于:所述步骤(7)具体操作步骤如下:
步骤(7.1)关闭惰性气体瓶阀门,打开真空泵阀门,将钢板层内压力抽至0.01-0.001MPa;
步骤(7.2)关闭真空泵阀门,打开惰性气体瓶阀门,补充惰性气体至常压;
步骤(7.3)重复步骤(7.1)和(7.2),反复两次,将钢板层空气含量降至0.0001MPa以下。
6.根据权利要求1所述的一种钽钢复合板,其特征在于:所述步骤(9)板坯经轧机轧制,累计下压量大于80%。
7.根据权利要求1所述的一种钽钢复合板,其特征在于:所述步骤(9)中将板坯经轧机轧制至需要的尺寸之后对板坯进行退火处理。
8.根据权利要求7所述的一种钽钢复合板,其特征在于:所述退火处理需将板坯加热至600-1100℃,保温30-80min。
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