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Preparation method of high-strength high-temperature-resistant isotropic graphite
The invention discloses a preparation method of high-strength high-temperature-resistant isotropic graphite, which comprises the following steps: firstly, carrying out boiling reflux oxidation pretreatment on chopped carbon fibers (CF) in nitric acid, and adding the pretreated chopped CF into a certain amount of ethanol for ultrasonic dispersion; then adding mesocarbon microbeads (MCMB) into an ultrasonic bath, uniformly stirring and mixing, and mechanically crushing the dried mixture into powder with the average particle size of 10-50 microns; then carrying out isostatic compaction to obtain a green body of the CF/MCMB composite material, and then carrying out carbonization and graphitization treatment; and finally, putting the graphitized sample into the prepared boric acid/borax/potassium chromate impregnation liquid for repeated impregnation, and removing crystal water at 450 DEG C to obtain the high-strength high-temperature-resistant isotropic graphite. According to the preparation method of the high-strength high-temperature-resistant isotropic graphite, the boron antioxidant is introduced, a protective layer is formed at high temperature, the oxidation resistance of the graphite is improved, and the defect of poor MCMB interface bonding performance is overcome by utilizing the characteristic of high modulus of CF.
本发明公开了一种高强度耐高温各向同性石墨的制备方法，首先将短切碳纤维(CF)在硝酸中沸腾回流氧化预处理，并将经预处理的短切CF添加到一定量的乙醇中进行超声分散；随后将中间相炭微球(MCMB)添加到超声浴中搅拌均匀混合，并将干燥后的混合料机械粉碎成平均粒度为10‑50μm的粉料；然后通过等静压成型得到CF/MCMB复合材料的生胚，随后进行炭化和石墨化处理；最后石墨化样品放入配制好的硼酸/硼砂/铬酸钾浸渍液中进行反复浸渍，并在450℃下脱除结晶水，从而得到高强度耐高温各向同性石墨。该高强度耐高温各向同性石墨的制备方法引入硼系抗氧化剂，在高温时形成保护层，提高石墨的抗氧化性，并且利用CF高模量的特点，弥补了MCMB界面结合性能差的缺点。
Preparation method of high-strength high-temperature-resistant isotropic graphite
The invention discloses a preparation method of high-strength high-temperature-resistant isotropic graphite, which comprises the following steps: firstly, carrying out boiling reflux oxidation pretreatment on chopped carbon fibers (CF) in nitric acid, and adding the pretreated chopped CF into a certain amount of ethanol for ultrasonic dispersion; then adding mesocarbon microbeads (MCMB) into an ultrasonic bath, uniformly stirring and mixing, and mechanically crushing the dried mixture into powder with the average particle size of 10-50 microns; then carrying out isostatic compaction to obtain a green body of the CF/MCMB composite material, and then carrying out carbonization and graphitization treatment; and finally, putting the graphitized sample into the prepared boric acid/borax/potassium chromate impregnation liquid for repeated impregnation, and removing crystal water at 450 DEG C to obtain the high-strength high-temperature-resistant isotropic graphite. According to the preparation method of the high-strength high-temperature-resistant isotropic graphite, the boron antioxidant is introduced, a protective layer is formed at high temperature, the oxidation resistance of the graphite is improved, and the defect of poor MCMB interface bonding performance is overcome by utilizing the characteristic of high modulus of CF.
本发明公开了一种高强度耐高温各向同性石墨的制备方法，首先将短切碳纤维(CF)在硝酸中沸腾回流氧化预处理，并将经预处理的短切CF添加到一定量的乙醇中进行超声分散；随后将中间相炭微球(MCMB)添加到超声浴中搅拌均匀混合，并将干燥后的混合料机械粉碎成平均粒度为10‑50μm的粉料；然后通过等静压成型得到CF/MCMB复合材料的生胚，随后进行炭化和石墨化处理；最后石墨化样品放入配制好的硼酸/硼砂/铬酸钾浸渍液中进行反复浸渍，并在450℃下脱除结晶水，从而得到高强度耐高温各向同性石墨。该高强度耐高温各向同性石墨的制备方法引入硼系抗氧化剂，在高温时形成保护层，提高石墨的抗氧化性，并且利用CF高模量的特点，弥补了MCMB界面结合性能差的缺点。
Preparation method of high-strength high-temperature-resistant isotropic graphite
一种高强度耐高温各向同性石墨的制备方法
YANG JIANXIAO (author) / SU ZHANPENG (author) / ZHANG JIBIN (author)
2024-01-26
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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