导　　师： 白晓军;匡同春

学科专业： 080502

授予学位： 硕士

作　　者： ;

机构地区： 广东工业大学

摘　　要： 本文率先采用火焰法在硬质合金表面上沉积多种连续、致密的复合碳涂层，对多种复合碳涂层进行了较全面的表征分析，并探讨了火焰结构合硬质合金基体表面状态对复合碳涂层表面形貌、相组成以及涂层的结合性能的影响。 首先，自行制作了一套实验室研究用燃烧火焰装置，并摸索了沉积碳材料的主要工艺参数范围。 初步探讨了火焰结构对火焰法沉积复合碳涂层的影响趋势，经240#金刚石磨盘研磨处理过的YG16硬质合余表面采用火焰法沉积碳材料时，由于火焰结构固有的特性，火焰中存在明显的温度场和原子氢、碳氢等基团的浓度场，且沿火焰的径向呈梯度分布，内焰中心的温度明显高于内焰外围的温度，所以，硬质合金表面所沉积的碳材料面积内明显可见中心灰白区和外围黑色区，2区均已形成连续致密的碳涂层。 在自制火焰装置上对研磨脱钴处理的YG8和YG16硬质合金表面，采用R/(C/_2H/_2//O/_2/)=1、喷嘴离硬质合金表面5cm距离、合适的冷却/(硬质合金表面温度约800℃/)等条件下，在内焰中率先沉积出连续致密的、以碳纳米管为主的、共生金刚石碳和无序碳的致密的复合碳涂层，该涂层与硬质合金基体之间呈锯齿状咬合，结合性能良好。还对YG8硬质合金表面进行不同工艺预处理，在较短沉积时间内即可生长出致密的金刚石膜和类金刚石碳/(diamond-likecarbon/)膜。 在此基础上，为了弄清硬质合金表面原始态与研磨态对火焰法沉积复合碳涂层的影响程度，设计了3种不同Co含量硬质合金原始态与研磨态的比较实验。实验结果表明，Co含量较高的硬质合金表面有利于沉积碳纳米管；与原始态的沉积产物对比来看，研磨态硬质合金表面生成碳纳米管的趋势更明显。 In this paper, Combustion Flame was used to deposit compact composite carbon coatings onto cemented carbide surface for the first time. These coatings have been characterized wholly. The influence of pre-treatment and flame structure to the variations of phases and microstructure of the coatings have been investigated. In this study, all composite coatings were deposited by a flame system we established. The effect of flame structure on composite carbon coating had been investigated. After deposition, two distinct carbon coatings locating from inner to fringe respectively had been found on YG16 surface that had been lapped by using 240# diamond grinding disk before deposition, because the gradient variance of the temperature and atmosphere. In this study, both coatings had been characterized. It showed that both coatings were continuous and compact. When the condition include the following: cemented carbide which had been lapped and decobalted was chosen as substrate, R/(C2H2//O2/)=1, the distance between spray nozzle and cemented carbide surface was 5cm, the temperature of substrate surface was controlled at about 800癈, a continuous compact carbon nano-tube coating mixed with diamond and amorphous carbon was formed on the substrate. The adhesion between the coating and substrate seems pretty good. Then depositing diamond and DLC/(diamond-like carbon/) film onto cemented carbide which had been grinded and decobalted with a short deposition time was studied. In order to find out the influence of substrate statement and deposition time to the variations of composite carbon coating, several parameters including Co content of substrate, lap of substrate surface and deposition time have been investigated. The result showed that the increasing of Co content, deposition time would favor to the formation of carbon nano tube than diamond. And the trend of depositing carbon nano tube on lapped substrate was greater than origin substrate surface.

关 键 词： 火焰法 硬质合金 金刚石 碳纳米管 类金刚石碳

领　　域： [金属学及工艺] [金属学及工艺]