CN114959905A - 一种无催化剂合成碳化钽纳米晶须及制备方法 - Google Patents
一种无催化剂合成碳化钽纳米晶须及制备方法 Download PDFInfo
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- NFFIWVVINABMKP-UHFFFAOYSA-N methylidynetantalum Chemical compound [Ta]#C NFFIWVVINABMKP-UHFFFAOYSA-N 0.000 title claims abstract description 11
- 238000002360 preparation method Methods 0.000 title abstract description 12
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- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 22
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 239000000919 ceramic Substances 0.000 claims description 8
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/60—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape characterised by shape
- C30B29/62—Whiskers or needles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/36—Carbides
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/584—Recycling of catalysts
Abstract
本发明涉及一种无催化剂合成碳化钽纳米晶须及制备方法,该方法生产工艺不借助催化剂,无金属杂质引入,TaC纳米晶须具有高纯度。同时,所需要的生产设备简单,工艺过程简单,参数易于控制,可靠性和重复性好,易于实现规模化生产。本发明工艺方法制备的TaC纳米晶须具有高纯度、大长径比(125‑2000)的明显优点,因而具有较高的比强度,可作为一种理想的纳米增强体应用于各种复合材料中,以显著提高材料的强度与抗热震性,也可提高其导电性能。
Description
技术领域
本发明属于纳米材料制备技术,涉及一种无催化剂合成碳化钽纳米晶须及制备方法。
背景技术
TaC作为一种杰出的过渡金属碳化物,具有高硬度(莫氏硬度9-10)、高熔点 (~3880℃)、高杨氏模量(283-550GPa),良好的电导性(25℃时32.7-117.4μΩ·cm)和较好的耐化学腐蚀和抗氧化性,在高温领域具有诱人的应用前景。TaC纳米晶须除了兼具TaC陶瓷的优良性能外,还具有较高长径比,缺陷少,具有很高的比强度,是一种理想的复合材料增强体,应用于陶瓷基和C/C复合材料中可显著提高其强度与抗热震性,应用于高分子复合材料中能显著提高材料的强度和模量,同时可显著提高其导电性能。同时,TaC纳米晶须还具有优异的导电性能与化学稳定性,在电子探针、微电子器件的组装等方面具有潜在的优势。
目前,有关TaC纳米晶须的制备方法报道较少,且多引入金属粉末作为催化剂。
文献1“M.Johnsson and M.Nygren.Carbothermal synthesis of TaC whiskersvia a vapor-liquid-solid growth mechanism.Journal of Materials Research,1997,12(9): 2419-2427.”采用Ni作为催化剂在Ta2O5-C-NaCl反应体系,在相对较低温度区域(1200-1300℃)中通过碳热还原法生长了笔直且表面光滑的TaC晶须。该文献制备的晶须直径为0.1-0.6μm,长度为10-30μm。主要杂质是TaC颗粒,少量未反应的碳和Ni 催化剂的残留物。
文献2“Y.J.Chen,J.B.Li,Q.M.Wei,et al.Preparation of differentmorphology of TaCx whiskers.Materials Letters,2002,56:279-283.”不同的原料体系通过碳热还原法,在惰性气体及1150-1350℃的工艺条件下成功制备出不同形貌的碳化钽晶须(TaCx)。由Ta2O5-C-KCl-Ni体系制备的晶须一部分呈四方柱状,直径约为0.6μm,长度为3μm;而另一部分则为带有锯齿形尖端的方形圆锥体,长度为1-10μm。由Ta2O5-C-NaCl-Ni 体系制备的晶须大部分是四方柱状,顶端带有球形液滴,其直径为0.2-0.5μm,长度为5-10μm。由Ta2O5-NaF-C-C12H22O11(蔗糖)体系制备的晶须簇状生长,呈平直的纤维形态,其直径为0.1-0.5μm,长度为10-50μm。
文献3“X.Y.Tao,J.Du,Y.P.Li,et al.TaC nanowire/activated carbonmicrofiber hybrid structures from bamboo fibers.Advanced Energy Materials,2011,1:534-539.”通过浸渍、干燥和固化,将催化剂和钽前驱体(Ta2O5-NaF-ZnCl2-Ni(NO3)2·6H2O-Fe(NO3)3·9H2O) 负载到竹纤维上,在1300℃热处理2小时后得到TaC纳米线/活性炭超细纤维杂化结构,大量TaC纳米线在碳微纤维上呈放射状生长。其表面光滑,尖端带有催化剂颗粒,直径约为110nm,长度大于20μm。
文献4“J.Wang,G.D.Li,X.Xiong,et al.Growth mechanism of TaC whiskerssynthesized via Ta2O5-NaF-C system.Materials Science and Engineering of PowderMetallurgy,2016,21(1):65-71.”利用Ta2O5-NaF-C体系通过碳热还原法在1200℃热处理3小时制备不同形貌TaC晶须,其中圆柱状晶须长度为6.6-144.5μm,直径为 0.30-0.84μm,并可观察到球状液滴结构;呈规则的四棱锥头的四方柱状晶须表面光滑,长度为25.2-67.0μm,截面为正方形,边长为1.8-2.8μm。
综合分析,制备TaC纳米晶须大多需要借助金属催化剂,而催化剂的引入影响了纳米晶须的纯度。而且,从上述文献可以看出,现有工艺制备的TaC晶须长度均较短,因而长径比小(5-482)。本发明采用碳热还原法制备的TaC纳米晶须直径分布在 0.2-0.4μm,长度约为50-400μm,长径比为125-2000,且无金属催化剂引入,纳米晶须纯度较高。同时,制备工艺简单,制备周期短,可靠性和重复性好。
发明内容
要解决的技术问题
为了避免现有技术的不足之处,本发明提出一种无催化剂合成碳化钽纳米晶须及制备方法,提出了制备出直径0.2-0.4μm,长度约为50-400μm且高纯度的TaC纳米晶须的工艺方法。
技术方案
一种无催化剂合成碳化钽纳米晶须,其特征在于:采用碳热还原法制备的TaC纳米晶须直径分布在0.2-0.4μm,长度约为50-400μm,长径比为125-2000。
一种制备所述无催化剂合成碳化钽纳米晶须的方法,其特征在于步骤如下:
步骤1:将活性炭C、氧化钽Ta2O5和氟化钠NaF粉末,放入陶瓷研钵中研磨使其混合均匀,将粉体均匀铺入石墨坩埚;
所述C:Ta2O5:NaF的摩尔比为1:0.05-0.35:0.3-1.2;
步骤2:将盛有混合粉末的石墨坩埚,置于横卧式管式电阻炉中,在惰性气体保护下进行碳热还原反应,以5-8℃/min升温速率升至1200-1450℃,保温2-4h;以 4-6℃/min降温速率降至200-400℃,随炉冷却至室温后,取出石墨坩埚即得到TaC纳米晶须。
所述步骤1的混合粉末通过100-300目过筛。
所述步骤2的惰性气体为氩气Ar或氮气N2。
所述步骤2的惰性气体的气流量为20-60ml/min。
有益效果
本发明提出的一种无催化剂合成碳化钽纳米晶须及制备方法,该方法生产工艺不借助催化剂,无金属杂质引入,TaC纳米晶须具有高纯度。同时,所需要的生产设备简单,工艺过程简单,参数易于控制,可靠性和重复性好,易于实现规模化生产。本发明工艺方法制备的TaC纳米晶须具有高纯度、大长径比(125-2000)的明显优点,因而具有较高的比强度,可作为一种理想的纳米增强体应用于各种复合材料中,以显著提高材料的强度与抗热震性,也可提高其导电性能。
附图说明
图1为实施例1合成的TaC纳米晶须的X射线衍射谱图
图2为实施例1合成的TaC纳米晶须的扫描电子显微镜图
具体实施方式
现结合实施例、附图对本发明作进一步描述:
实施例1:
步骤1:按照摩尔比C:Ta2O5:NaF=1:0.2:0.4配制原料,放入陶瓷研钵中研磨使其混合均匀。混合粉末通过100目过筛,过筛粉体均匀铺入石墨坩埚。
步骤2:将步骤2中盛有混合粉末的石墨坩埚,置于横卧式管式电阻炉中,然后通入气流量为30ml/min的氮气,以5℃/min升温速率升至1400℃,保温2h。以4℃/min 降温速率降至400℃,随炉冷却至室温后,取出石墨坩埚即可得到TaC纳米晶须。
采用实施例1成功制备出了TaC纳米晶须,其X射线衍射谱图见图1,扫描电子显微镜图见图2。该TaC纳米晶须尖端无催化剂颗粒,直径约为0.28μm,长度约为 50-200μm,长径比约为180-715。综合X射线衍射谱图和扫描电子显微镜图,均可看出无催化剂杂质引入,纳米晶须纯度较高。
实施例2:
步骤1:按照摩尔比C:Ta2O5:NaF=1:0.3:0.8配制原料,放入陶瓷研钵中研磨使其混合均匀。混合粉末通过200目过筛,过筛粉体均匀铺入石墨坩埚。
步骤2:将步骤2中盛有混合粉末的石墨坩埚,置于横卧式管式电阻炉中,然后通入气流量为40ml/min的氩气,以6℃/min升温速率升至1350℃,保温2h。以4℃/min 降温速率降至300℃,随炉冷却至室温后,取出石墨坩埚即可得到TaC纳米晶须。
实施例3:
步骤1:按照摩尔比C:Ta2O5:NaF=1:0.1:1.0配制原料,放入陶瓷研钵中研磨使其混合均匀。混合粉末通过300目过筛,过筛粉体均匀铺入石墨坩埚。
步骤2:将步骤2中盛有混合粉末的石墨坩埚,置于横卧式管式电阻炉中,然后通入气流量为60ml/min的氮气,以7℃/min升温速率升至1300℃,保温3h。以5℃/min 降温速率降至200℃,随炉冷却至室温后,取出石墨坩埚即可得到TaC纳米晶须。
实施例4:
步骤1:按照摩尔比C:Ta2O5:NaF=1:0.2:1.2配制原料,放入陶瓷研钵中研磨使其混合均匀。混合粉末通过100目过筛,过筛粉体均匀铺入石墨坩埚。
步骤2:将步骤2中盛有混合粉末的石墨坩埚,置于横卧式管式电阻炉中,然后通入气流量为20ml/min的氩气,以8℃/min升温速率升至1200℃,保温4h。以6℃/min 降温速率降至200℃,随炉冷却至室温后,取出石墨坩埚即可得到TaC纳米晶须。
Claims (5)
1.一种无催化剂合成碳化钽纳米晶须,其特征在于:采用碳热还原法制备的TaC纳米晶须直径分布在0.2-0.4μm,长度约为50-400μm,长径比为125-2000。
2.一种制备权利要求1所述无催化剂合成碳化钽纳米晶须的方法,其特征在于步骤如下:
步骤1:将活性炭C、氧化钽Ta2O5和氟化钠NaF粉末,放入陶瓷研钵中研磨使其混合均匀,将粉体均匀铺入石墨坩埚;
所述C:Ta2O5:NaF的摩尔比为1:0.05-0.35:0.3-1.2;
步骤2:将盛有混合粉末的石墨坩埚,置于横卧式管式电阻炉中,在惰性气体保护下进行碳热还原反应,以5-8℃/min升温速率升至1200-1450℃,保温2-4h;以4-6℃/min降温速率降至200-400℃,随炉冷却至室温后,取出石墨坩埚即得到TaC纳米晶须。
3.根据权利要求2所述的方法,其特征在于:所述步骤1的混合粉末通过100-300目过筛。
4.根据权利要求2所述的方法,其特征在于:所述步骤2的惰性气体为氩气Ar或氮气N2。
5.根据权利要求2所述的方法,其特征在于:所述步骤2的惰性气体的气流量为20-60ml/min。
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