摘要
金刚石的高温化学稳定性直接影响着陶瓷结合剂的耐火度和陶瓷结合剂金刚石制品的使用寿命。通过研究不同品级的金刚石在不同烧成条件下金刚石晶体的烧失量变化，结果表明：①相同条件下，金刚石品级越高，烧失量越小；裸烧时温度越高，烧失量越大，当温度达到1073K时发生明显的化学反应，达到1173K时，热腐蚀较大。②当通入氩气作保护气时，到1173K才开始发生明显的化学反应。③而埋砂烧成（陶瓷结合剂金刚石试块中）的金刚石与裸烧后金刚石的晶体腐蚀情况相比，埋砂烧成的金刚石晶体耐热腐蚀性好，当温度高于1073K时，埋砂条件下金刚石的抗冲击强度比在同等温度、同等烧成气氛下裸烧金刚石要高出大约30～40％，因此在试验温度范围内陶瓷结合剂不会加速金刚石晶体的氧化腐蚀。
It is well known that the chemical stability of diamond in high temperature is an important factor which affects the duration of vitrified bonded diamond products and the refractory temperature of vitrified bond. From testing the change of weight, crystal shape, and crystal impacting strength in various sintering condition in this paper, the following conclusions can be obtained： ①. When diamonds are firing in the air, there are obviously oxidation of diamond in 1073K and this oxidation of diamond will be aggravated with the increasing of temperature, the diamond crystals are seriously destroyed at 1173K, furthermore, the higher the diamond quality grade, the smaller the losing of diamond weight; ②The temperature of obviously oxidation will be delayed to 1173K when Argon is used as the protecting gas; ③. Comparing diamonds which are mixed with vitrified bond, buried into the sand then sintered with diamonds which are sintered in the air, it can be seen that the change of crystal shape of the former is much smaller than the latter and the impacting strength of crystal of diamond of the former is approximately larger 30 - 40% than that of latter when the temperature range is 1073k- 1273k, this means that vitrified bond can＇t accelerate the oxidation of diamond crystal during the temperature range of experiment.
出处
《金刚石与磨料磨具工程》
CAS
北大核心
2006年第4期8-11,共4页
Diamond & Abrasives Engineering
关键词
金刚石
高温化学稳定性
陶瓷结合剂
diamond
chemical stability in high temperature
vitrified bond
