【摘要】：本文主要研究了利用機械合金化方法制備過渡族金屬碳化物納米晶粉體碳化鎢，并利用X射線衍射方法理論對不同球磨時間的粉體進行了定性分析和定量分析，研究其物相組成、晶粒大小、各相成分含量，并對機械合金化的過程進行了分析。另一方面，應用放電等離子燒結(jié)的方法對碳化鎢納米晶粉體進行了燒結(jié)致密化，并對得到的燒結(jié)體進行了X射線衍射分析，分析其物相組成，晶粒大小，各相成分含量，并對比了燒結(jié)前后的樣品的各種變化。除此之外，本文研究了燒結(jié)過程中樣品的位移以及位移率伴隨燒結(jié)溫度所表現(xiàn)的變化特點，對放電等離子燒結(jié)過程進行了理論分析。最后，對燒結(jié)體進行了一系列的性能測試。 XRD分析結(jié)果表明，在高能球磨的作用下，樣品發(fā)生了機械激活和化學激活，成功合成了新的物質(zhì)W2C和WC。隨著球磨時間的增加，W單質(zhì)的含量逐漸減少，W2C的含量先增加后減少，WC的含量逐漸增加，球磨70h的樣品中WC的含量占到了100%，，說明在球磨過程中W2C僅是生成WC的中間產(chǎn)物。在球磨過程中原始粉的顆粒尺寸減小，晶粒細化，說明機械合金化確實可以細化晶粒。 燒結(jié)實驗結(jié)果表明，我們成功地制備了WC塊體；通過對其X射線衍射圖進行全譜擬合分析，結(jié)果表明球磨時間越長，樣品的碳含量越高，因此通過控制球磨時間可以調(diào)控碳含量。此外，我們發(fā)現(xiàn)球磨時間越長，燒結(jié)樣品的密度越小，球磨40h的燒結(jié)體的硬度最大，可達到2250HV。所以可以看出機械合金化和放電等離子燒結(jié)方法的搭配在一定的條件下可以產(chǎn)生性能優(yōu)異的過渡族金屬碳化物納米晶燒結(jié)體碳化鎢。
[Abstract]:In this paper, the preparation of transition metal carbide nanocrystalline tungsten carbide by mechanical alloying method was studied. The qualitative analysis and quantitative analysis of the powders with different milling time were carried out by using the theory of X-ray diffraction. The phase composition, grain size and composition content of each phase were studied, and the process of mechanical alloying was analyzed. On the other hand, the sintering densification of tungsten carbide nanocrystalline powder was carried out by spark plasma sintering, and the phase composition, grain size and content of each phase were analyzed by X-ray diffraction. The changes of samples before and after sintering were compared. In addition, the variation characteristics of the displacement and displacement rate of the sample with sintering temperature during sintering were studied, and the SPS process was analyzed theoretically. Finally, a series of performance tests were carried out on the sintered body. The results of XRD analysis showed that the samples were mechanically and chemically activated under the action of high energy ball milling, and the new substances W2C and WC were successfully synthesized. With the increase of milling time, the content of W _ 2C increased firstly and then increased gradually, and the content of WC in the sample of 70 h ball milling accounted for 100%, indicating that W2C was only the intermediate product of WC formation during ball milling. In the process of ball milling, the particle size of the original powder decreases and the grain is refined, which indicates that mechanical alloying can refine the grain. The results of sintering experiment show that the WC block has been successfully prepared and the carbon content of the sample increases with the increase of ball milling time through the full-spectrum fitting analysis of its X-ray diffraction pattern. Therefore, the carbon content can be controlled by controlling the milling time. In addition, we found that the longer the ball milling time, the smaller the density of the sintered sample, and the maximum hardness of the sintered material was 2250 HV after 40 h ball milling. Therefore, it can be seen that the combination of mechanical alloying and spark plasma sintering can produce transition metal carbide nanocrystalline tungsten carbide with excellent properties under certain conditions.
【學位授予單位】：燕山大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TF123.31;TF124.5

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