本文選題：聚晶金剛石復(fù)合片 + 高溫高壓合成工藝��； 參考：《吉林大學(xué)》2017年碩士論文

【摘要】：聚晶金剛石復(fù)合片(Polycrystalline Diamond Compact,簡(jiǎn)稱(chēng)PDC)是一種復(fù)合型超硬材料,是通過(guò)將金剛石微粉燒結(jié)在硬質(zhì)合金基體上而得到的一種兼具兩種材料優(yōu)異性能的新型材料。同其它材料相比,它既具備聚晶金剛石材料優(yōu)異的導(dǎo)熱性能、超高硬度以及超高耐磨性,又具備硬質(zhì)合金材料的高強(qiáng)度和抗沖擊韌性,所以PDC被廣泛應(yīng)用于工業(yè)切削刀具以及石油天然氣開(kāi)采、煤炭開(kāi)采、地質(zhì)勘探和巖心鉆進(jìn)等領(lǐng)域。傳統(tǒng)的PDC在鉆進(jìn)硬巖過(guò)程中會(huì)由于摩擦而產(chǎn)生大量的熱,使金剛石向石墨發(fā)生轉(zhuǎn)化,降低PDC鉆頭的性能。因而需要對(duì)鉆探用PDC進(jìn)行提高耐熱性的研究。本文在國(guó)家自然科學(xué)基金委面上項(xiàng)目 硬巖鉆探用金剛石復(fù)合片仿生結(jié)構(gòu)設(shè)計(jì)及強(qiáng)韌化機(jī)理‖(編號(hào)為41572357)的資助下,對(duì)提高PDC的耐熱性能進(jìn)行了試驗(yàn)研究。采用國(guó)產(chǎn)鉸鏈?zhǔn)?×1200MN型六面頂壓機(jī),用熔滲法結(jié)合混合粉末燒結(jié)的方法進(jìn)行PDC的合成試驗(yàn),確定的合成條件為:壓力5.0~6.5GPa,溫度1350~1650℃,合成時(shí)間5~7min。對(duì)影響PDC合成及耐熱性的一些因素進(jìn)行了試驗(yàn)分析和優(yōu)化設(shè)計(jì):(1)對(duì)壓機(jī)腔體內(nèi)葉蠟石塊的組裝工藝對(duì)PDC合成及其耐熱性的影響進(jìn)行了試驗(yàn)分析與改進(jìn);(2)對(duì)溫度壓力條件對(duì)PDC合成及其耐熱性的影響進(jìn)行了分析;(3)確定了合成工藝曲線(xiàn)及合成方式,并分析了其對(duì)PDC耐熱性的影響;(4)確定了兩種提高PDC耐熱性能的添加劑體系(Co-Si-B體系和Ni-Ti-B體系),并對(duì)其組分和配比進(jìn)行了試驗(yàn)分析確定。采用SEM、EDS能譜分析、XRD等分析手段對(duì)兩種體系的PDC的微觀(guān)形貌、成分分布進(jìn)行了研究。結(jié)果表明,合成的PDC中金剛石均質(zhì)性較好、顆粒大小均勻,性能表現(xiàn)優(yōu)異,在合成的過(guò)程中形成了耐熱的金屬陶瓷復(fù)合相。對(duì)試驗(yàn)合成的PDC的耐熱性進(jìn)行了差重?zé)嶂胤治鰷y(cè)試,結(jié)果表明:常規(guī)PDC的抗氧化溫度一般為760℃,本文合成的兩種體系的PDC的抗氧化溫度分別為840℃和920℃,耐熱性分別提高了80℃和160℃。對(duì)使用熔滲結(jié)合混合粉末燒結(jié)方法高溫高壓合成的高耐熱性能PDC的合成機(jī)理進(jìn)行了分析。混合粉末的存在為熔滲金屬提供了滲透的通道,而熔滲金屬在高溫高壓條件下與復(fù)合界面附近產(chǎn)生的壓力差則為PDC合成的熔滲過(guò)程提供了驅(qū)動(dòng)力,通過(guò)添加劑與金剛石之間形成C-M-C(金剛石-金屬-金剛石)鍵的結(jié)合模式,提高了PDC中聚晶層的耐熱性能。
[Abstract]:Polycrystalline Diamond Compact (PDC) is a kind of composite superhard material, which is obtained by sintering diamond powder on cemented carbide matrix. Compared with other materials, it not only has excellent thermal conductivity, ultra-high hardness and ultra-high wear resistance of polycrystalline diamond materials, but also has high strength and impact toughness of cemented carbide materials. Therefore, PDC is widely used in industrial cutting tools, oil and gas mining, coal mining, geological exploration and core drilling. In the process of drilling hard rock by traditional PDC, a large amount of heat will be produced due to friction, which will transform diamond into graphite and reduce the performance of PDC bit. Therefore, it is necessary to improve the heat resistance of PDC for drilling. In this paper, with the aid of bionic structure design and strengthening and toughening mechanism of diamond composite sheet used for drilling hard rock in the project of National Natural Science Foundation of China (No. 41572357), an experimental study has been carried out to improve the heat resistance of PDC. The synthetic test of PDC was carried out by means of infiltration combined with mixed powder sintering in a 6 脳 1200MN type hexahedral top press made in China. The synthetic conditions were determined as follows: pressure 5.0 ~ 6.5GPa, temperature 1350 ~ 1650 鈩，

本文編號(hào)：1867124