CN108147828A - Max相陶瓷管材及其制备方法、核燃料包壳管 - Google Patents
Max相陶瓷管材及其制备方法、核燃料包壳管 Download PDFInfo
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Abstract
本发明公开了一种MAX相陶瓷管材及其制备方法、核燃料包壳管,制备方法包括以下步骤:S1、称取以下质量百分比的原料:5%‑15%的粘结剂、5%‑15%的塑化剂以及2%‑15%纤维增韧相;将原料加入去离子水中,配制成悬浊液;S2、将所述悬浊液加入MAX相纳米粉末中,制成固含量为60%‑90%的浆料;S3、采用挤出成型方法将所述浆料制成MAX相陶瓷管坯;S4、将所述MAX相陶瓷管坯进行无压烧结,制得MAX相陶瓷管材。本发明的MAX相陶瓷管材适用于事故容错核燃料包壳,极大地提高了核反应堆在严重事故工况下维持核燃料组件结构与功能完整性的抗事故能力。
Description
技术领域
本发明涉及核燃料技术领域,尤其涉及一种可用于核燃料的MAX相陶瓷管材及其制备方法、核燃料包壳管。
背景技术
在核事故发生以后,核电安全再次成为国际民众普遍关注的焦点,而如何进一步提高核电安全性特别是提高核反应堆抵抗超设计基准核事故的安全阈值也成为核能可持续发展的重要议题。事故容错核燃料(Accident Tolerant Fuels,ATF)这一全新核安全技术概念正是在这一背景下诞生的,并逐渐成为世界核电工业最重要的研究课题之一,其目的是对现有锆合金/二氧化铀燃料体系进行改进升级甚至全面更新替换以实现降低包壳与高温水蒸气的反应焓热和氢气生成量、提升包壳在1200℃事故高温下的结构完整性与功能性以及增强包壳对裂变气体的束缚能力等。
目前事故容错核燃料包壳备选材料有难熔钼合金、先进不锈钢、SiC复合材料以及MAX相陶瓷包壳管等,其中难熔钼合金高温氧化性能差,先进不锈钢材料中子经济性差,SiC复合材料具有易溶于水的特点,MAX相陶瓷材料具有低的热膨胀系数、高的弹性模量、高强度、高硬度、良好高温抗氧化性能和耐腐蚀性能、良好的导电、导热性、易加工性能、高的损伤容限及热冲击抗性等优点,MAX相包壳管是实现ATF技术特点的备选包壳材料。
采用高强度、高弹性的纤维与陶瓷基体复合,是提高陶瓷韧性和可靠性的一个有效的方法。但是,目前仍局限在纤维与基体的界面结合、增韧机制的研究等方面,并未涉及核级陶瓷包壳管的制备方法的研究。此外,在核级陶瓷管材,壁厚均匀可控、长度可控的强韧化MAX相陶包壳管技术障碍尚未有突破。
发明内容
本发明要解决的技术问题在于,提供一种强韧化的MAX相陶瓷管材及其制备方法、核燃料包壳管。
本发明解决其技术问题所采用的技术方案是:提供一种MAX相陶瓷管材的制备方法,包括以下步骤:
S1、称取以下质量百分比的原料:5%-15%的粘结剂、5%-15%的塑化剂以及2%-15%纤维增韧相;将原料加入去离子水中,配制成悬浊液;
S2、将所述悬浊液加入MAX相纳米粉末中,制成固含量为60%-90%的浆料;
S3、采用挤出成型方法将所述浆料制成MAX相陶瓷管坯;
S4、将所述MAX相陶瓷管坯进行无压烧结,制得MAX相陶瓷管材。
优选地,所述MAX相纳米粉末包括Ti3SiC2、Ti3AlC2、Ti2AlC、Cr2AlC、Ti2AlN、Zr3SiC2、Zr3AlC2、Zr2AlN、Cr2AlN中的一种或多种。
优选地,所述纤维增韧相包括短切纤维、晶须中的一种或多种;所述短切纤维包括碳纤维、碳化硅纤维、氮化硅纤维、氧化铝纤维的一种或多种。
优选地,所述MAX相陶瓷管坯通过挤出成型且在无压烧结前,静置12-48h。
优选地,步骤S4中,所述无压烧结包括:在惰性气体气氛下,以2-5℃/min的升温速率升温至300-500℃,保温2-5h;再以10℃/min的升温速率升温至1400-1600℃,保温2-10h;冷却至室温。
优选地,制得的所述MAX相陶瓷管材的孔隙率≤10%。
本发明还提供一种MAX相陶瓷管材,采用上述的制备方法制得。
本发明还提供另一种MAX相陶瓷管材,由固含量60%-90%的浆料制成;所述浆料包括MAX相纳米粉末、去离子水以及以下质量百分比的原料:5-15%的粘结剂、5-15%的塑化剂、2-15%纤维增韧相。
优选地,所述MAX相纳米粉末包括Ti3SiC2、Ti3AlC2、Ti2AlC、Cr2AlC、Ti2AlN、Zr3SiC2、Zr3AlC2、Zr2AlN、Cr2AlN中的一种或多种。
优选地,所述纤维增韧相包括短切纤维、晶须中的一种或多种;所述短切纤维包括碳纤维、碳化硅纤维、氮化硅纤维、氧化铝纤维的一种或多种。
本发明还提供一种核燃料包壳管,采用上述的MAX相陶瓷管材制成。
本发明的有益效果:MAX相陶瓷管材原料中粘结剂、塑化剂的加入一方面大大提高原料的可成型性,解决管材成型问题;另一方面促进纤维和MAX相陶瓷基体的结合,利于管材的烧结制备。纤维增韧相的加入解决了MAX相陶瓷脆性问题,弯曲强度、断裂韧性大幅提高,且MAX相陶瓷耐氧化性能优异。
本发明解决了目前MAX相陶瓷管材脆性问题、纤维增韧相与基体结合问题、管材成型问题以及陶瓷管材批量化生产等问题,适用于事故容错核燃料包壳,充分利用MAX相陶瓷抗热震性能、耐高温腐蚀性能以及高辐照容忍性,拓展MAX相陶瓷包壳管在事故容错核燃料的应用,提升核反应堆在严重事故工况下维持核燃料组件结构与功能完整性的抗事故能力和安全阈值。
具体实施方式
本发明的MAX相陶瓷管材的制备方法,可包括以下步骤:
S1、称取以下质量百分比的原料:5%-15%的粘结剂、5%-15%的塑化剂以及2%-15%纤维增韧相;将原料加入去离子水中,配制成悬浊液。
其中,纤维增韧相包括短切纤维、晶须中的一种或多种。短切纤维包括碳纤维、碳化硅纤维、氮化硅纤维、氧化铝纤维的一种或多种。粘结剂可采用羟丙基甲基纤维素,塑化剂可采用聚乙二醇。
制得的悬浊液,还进行超声搅拌实现原料均匀混合。
S2、将悬浊液加入MAX相纳米粉末中,制成固含量为60%-90%的浆料。
浆料中,去离子水和MAX相纳米粉末根据固含量的要求适量加入。根据不同固含量,制成MAX相(包括211、312、413、514、615、716构型)陶瓷浆料。
MAX相纳米粉末包括Ti3SiC2、Ti3AlC2、Ti2AlC、Cr2AlC、Ti2AlN、Zr3SiC2、Zr3AlC2、Zr2AlN、Cr2AlN中的一种或多种。
S3、采用挤出成型方法将浆料制成MAX相陶瓷管坯。
挤出成型方法的应用,利于制成壁厚均匀、长度可控的管坯,同时可批量化生产,解决工业化应用问题。
成型的MAX相陶瓷管坯静置12-48h,再进行后续的无压烧结。
S4、将MAX相陶瓷管坯进行无压烧结,制得MAX相陶瓷管材。
制得的MAX相陶瓷管材的孔隙率≤10%;壁厚均匀,长度可控,具有优异的抗高温氧化性能和耐磨性能,可作为事故容错燃料元件包壳管,在事故工况下高温氧化和抵御格架的微振磨损作用。
其中,无压烧结包括:在惰性气体(如氩气)气氛下,以2-5℃/min的升温速率升温至300-500℃,保温2-5h;再以10℃/min的升温速率升温至1400-1600℃,保温2-10h;冷却至室温。
本发明的制备方法制得的MAX相陶瓷管材,适用于事故容错核燃料包壳,作为核燃料包壳管材制成核燃料包壳管。MAX相陶瓷管材中原料纤维增韧相如碳化硅纤维的加入,不仅起到提高MAX相陶瓷管材韧性、强度的作用(纤维增强),使MAX相陶瓷管材具有强韧化特点,解决MAX相陶瓷管材脆性大的问题,同时增强MAX相陶瓷管材耐辐照肿胀性能,使MAX相陶瓷管材能承受一定剂量中子辐照损伤而不出现明显辐照脆化现象。粘结剂、塑化剂的加入解决MAX相陶瓷管坯成型难问题,同时利于纤维增韧相与陶瓷基体的结合,促进纤维与陶瓷基体在烧结过程的作用。
纤维增韧相使管材具有强韧化特点原理如下:首先一方面,裂纹在陶瓷基体扩展的过程中,纤维可以将裂纹尖端区域和陶瓷基体界面开裂区域裂纹桥联起来,在裂纹的表面形成闭合应力,有效抑制裂纹扩展;另一方面,裂纹在扩展过程中遇到纤维时,裂纹只能沿结合较弱的界面扩散,因此裂纹在陶瓷基体中的扩展路程增长,能够吸收更多的断裂能量。其次,当陶瓷基体受到外载荷时,陶瓷基体传向晶须的力会在界面开裂区和晶粒拔出区二者界面上产生剪应力,应力的持续增大会导致晶粒断裂从陶瓷基体中拔出,晶粒拔出的过程中界面摩擦会增加外界载荷能量消耗,减小裂纹在陶瓷基体中扩展速度。
本发明的MAX相陶瓷管材,由固含量60%-90%的浆料制成;浆料包括MAX相纳米粉末、去离子水以及以下质量百分比的原料:5-15%的粘结剂、5-15%的塑化剂、2-15%纤维增韧相。该MAX相陶瓷管材的孔隙率≤10%。
其中,MAX相纳米粉末包括Ti3SiC2、Ti3AlC2、Ti2AlC、Cr2AlC、Ti2AlN、Zr3SiC2、Zr3AlC2、Zr2AlN、Cr2AlN中的一种或多种。纤维增韧相包括短切纤维、晶须中的一种或多种;短切纤维包括碳纤维、碳化硅纤维、氮化硅纤维、氧化铝纤维的一种或多种。粘结剂可采用羟丙基甲基纤维素,塑化剂可采用聚乙二醇。
本发明的MAX相陶瓷管材用于核燃料包壳,作为MAX相陶瓷包壳管材,具有高热导、高强度、高辐照容忍性、耐腐蚀性、耐事故工况高温蒸汽氧化、耐磨蚀等优点。
本发明的核燃料包壳管,使用上述的MAX相陶瓷管材制成。核燃料包壳管包括燃料棒包壳管。
由MAX相陶瓷管材制成的核燃料包壳管,具有抗热震性能、耐高温腐蚀性能以及高辐照容忍性,提升核反应堆在严重事故工况下维持核燃料组件结构与功能完整性的抗事故能力和安全阈值。
以下通过具体实施例对本发明作进一步说明。
实施例1
首先称量100g羟甲基丙级纤维素、100g聚乙二醇、170ml去离子水及100g短切碳纤维,配制成悬浊液,用超声搅拌混合均匀,逐步添加到2000g的Ti3SiC2纳米粉体中,用球磨罐搅拌均匀。挤出压力为10MPa,采用挤出成型机制备出壁厚1mm、直径10mm的Ti3SiC2陶瓷管坯,经静置干燥24h后,利用管式炉在1450℃、氩气气氛下保温2h获得强韧化的Ti3SiC2陶瓷管材。获得的管材致密度达90%以上,抗拉强度为350MPa,断裂韧性为12MPa·m1/2,在1200℃水蒸汽条件下,氧化增重低于商用锆合金两个数量级。
实施例2
首先称量100g羟甲基丙级纤维素、75g聚乙二醇、100ml去离子水及60gAl2O3纤维,配制成悬浊液,用超声搅拌混合均匀,逐步添加到1000g的Ti3AlC2纳米粉体中,用球磨罐搅拌均匀。挤出压力为8MPa,采用挤出成型机制备出壁厚1mm、直径10mm的Ti3AlC2陶瓷管坯,经干燥24h后,利用管式炉在1500℃、氩气气氛下、保温5h获得强韧化的Ti3AlC2陶瓷管材。管材致密度达92%以上,抗拉强度为380MPa,断裂韧性为11MPa·m1/2,在1200℃水蒸汽条件下,氧化增重低于商用锆合金两个数量级。
实施例3
首先称量150g羟甲基丙级纤维素、100g聚乙二醇、100ml去离子水及60gSiC晶须,配制成悬浊液,用超声搅拌混合均匀,逐步添加到1000g的Zr3SiC2纳米粉体中,用球磨罐搅拌均匀。挤出压力为10MPa,采用挤出成型设备,制备出壁厚1mm、直径10mm的Zr3SiC2陶瓷管坯,经干燥24h后,利用管式炉在1500℃、氩气气氛下、保温10h获得强韧化的Zr3SiC2陶瓷管材。管材致密度约为92%左右,抗拉强度为350MPa,断裂韧性为10MPa·m1/2,在1200℃水蒸汽条件下,氧化增重低于商用锆合金两个数量级。
以上所述仅为本发明的实施例,并非因此限制本发明的专利范围,凡是利用本发明说明书内容所作的等效结构或等效流程变换,或直接或间接运用在其他相关的技术领域,均同理包括在本发明的专利保护范围内。
Claims (11)
1.一种MAX相陶瓷管材的制备方法,其特征在于,包括以下步骤:
S1、称取以下质量百分比的原料:5%-15%的粘结剂、5%-15%的塑化剂以及2%-15%纤维增韧相;将原料加入去离子水中,配制成悬浊液;
S2、将所述悬浊液加入MAX相纳米粉末中,制成固含量为60%-90%的浆料;
S3、采用挤出成型方法将所述浆料制成MAX相陶瓷管坯;
S4、将所述MAX相陶瓷管坯进行无压烧结,制得MAX相陶瓷管材。
2.根据权利要求1所述的MAX相陶瓷管材的制备方法,其特征在于,所述MAX相纳米粉末包括Ti3SiC2、Ti3AlC2、Ti2AlC、Cr2AlC、Ti2AlN、Zr3SiC2、Zr3AlC2、Zr2AlN、Cr2AlN中的一种或多种。
3.根据权利要求1所述的MAX相陶瓷管材的制备方法,其特征在于,所述纤维增韧相包括短切纤维、晶须中的一种或多种;所述短切纤维包括碳纤维、碳化硅纤维、氮化硅纤维、氧化铝纤维的一种或多种。
4.根据权利要求1所述的MAX相陶瓷管材的制备方法,其特征在于,所述MAX相陶瓷管坯通过挤出成型且在无压烧结前,静置12-48h。
5.根据权利要求1所述的MAX相陶瓷管材的制备方法,其特征在于,步骤S4中,所述无压烧结包括:在惰性气体气氛下,以2-5℃/min的升温速率升温至300-500℃,保温2-5h;再以10℃/min的升温速率升温至1400-1600℃,保温2-10h;冷却至室温。
6.根据权利要求1所述的MAX相陶瓷管材的制备方法,其特征在于,制得的所述MAX相陶瓷管材的孔隙率≤10%。
7.一种MAX相陶瓷管材,其特征在于,采用权利要求1-6任一项所述的制备方法制得。
8.一种MAX相陶瓷管材,其特征在于,由固含量60%-90%的浆料制成;所述浆料包括MAX相纳米粉末、去离子水以及以下质量百分比的原料:5-15%的粘结剂、5-15%的塑化剂、2-15%纤维增韧相。
9.根据权利要求8所述的MAX相陶瓷管材,其特征在于,所述MAX相纳米粉末包括Ti3SiC2、Ti3AlC2、Ti2AlC、Cr2AlC、Ti2AlN、Zr3SiC2、Zr3AlC2、Zr2AlN、Cr2AlN中的一种或多种。
10.根据权利要求8所述的MAX相陶瓷管材,其特征在于,所述纤维增韧相包括短切纤维、晶须中的一种或多种;所述短切纤维包括碳纤维、碳化硅纤维、氮化硅纤维、氧化铝纤维的一种或多种。
11.一种核燃料包壳管,其特征在于,采用权利要求7所述的MAX相陶瓷管材或权利要求8-10任一项所述的MAX相陶瓷管材制成。
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