本文選題：Hf + C��； 參考：《無(wú)機(jī)材料學(xué)報(bào)》2017年10期

【摘要】：以Hf Cl_4、乙酰丙酮、無(wú)水甲醇、對(duì)苯二酚為原料,采用一鍋法合成了Hf C陶瓷前驅(qū)體,通過(guò)前驅(qū)體裂解制備得到了Hf C陶瓷粉體。采用XRD、FTIR、SEM/EDS、TEM、SAED等分析手段對(duì)裂解產(chǎn)物的組成、形貌和微觀結(jié)構(gòu)進(jìn)行了分析和表征,利用TG-DSC和TG-MS對(duì)前驅(qū)體的裂解行為進(jìn)行了研究。結(jié)果表明:Hf C前驅(qū)體在600℃左右開(kāi)始陶瓷化,在1300℃左右開(kāi)始形成Hf C陶瓷相,在1500℃及以上完全轉(zhuǎn)化為Hf C陶瓷及自由碳。Hf C陶瓷相具有單晶結(jié)構(gòu),顆粒粒徑在50~100 nm之間。Hf C陶瓷相的形成基于前驅(qū)體在低溫段裂解形成的Hf O_2的碳熱還原反應(yīng),裂解過(guò)程中形成的自由碳抑制了Hf C晶體的生長(zhǎng)。
[Abstract]:HF C ceramic precursor was synthesized by one-pot method from HfCl4, acetylacetone, anhydrous methanol and hydroquinone. The composition, morphology and microstructure of the pyrolysis products were analyzed and characterized by means of XRD-FTIR / SEM- / EDSE-TEMSAED. The pyrolysis behavior of the precursor was studied by TG-DSC and TG-MS. The results show that the precursor begins to be ceramic at about 600 鈩，

本文編號(hào)：1889500