CaB_2O_4掺量对烧结后hBN结构及摩擦性能的影响
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摘要
为了促进h BN的结晶生长,降低其摩擦系数,研究了CaB_2O_4掺量对烧结后h BN结构和摩擦性能的影响。在h BN中加入CaB_2O_4作为烧结助剂,在N_2气氛下于2000℃保温5 h对不同CaB_2O_4掺量的h BN进行了烧结,采用XRD、SEM和摩擦磨损试验机对烧结后h BN的物相组成、显微结构和摩擦性能进行了表征,并探讨了烧结后h BN的摩擦磨损机理。结果表明:烧结后,h BN晶体呈片状。随着CaB_2O_4掺量由0%增加到15%,h BN晶体直径由0. 5～2μm逐渐增大到2～4. 5μm;晶体厚度由100 nm增加到200 nm,说明在N_2气氛下,2000℃,保温5 h时,CaB_2O_4的加入可以促进h BN的结晶生长。h BN块体的摩擦系数随着CaB_2O_4掺量的增加有下降的趋势。随着温度从室温增加到800℃,烧结后hBN的摩擦系数先增大后减小。
The effects of CaB_2O_4 contents on the microstructure and tribological properties of sintered hBN were studied,in order to promote crystal growth of hBN and decrease it's friction coefficient. The CaB_2O_4 was added into hBN as sintering additive. Then,the h BN with different CaB_2O_4 contents were sintered at 2000 ℃ for 5 h in N_2 ambience. The phase analysis,microstructure and tribological properties of the sintered hBN were studied by XRD,SEM and high-temperature tribometer. The tribological mechanism of sintered hBN was also discussed. The results show that the sintered hBN has a plate-like shape. The diameter of sintered hBN increases from 0. 5-2 μm to 2-4. 5 μm,meanwhile the thickness increases from 100 nm to 200 nm,with the increase of CaB_2O_4 content from 0% to 15%,which indicate that the addition of CaB_2O_4 as sintering additive can effectively promote crystal growth of hBN at 2000 ℃for 5 h in N_2 ambience. The friction coefficient of sintered h BN decreases with the increase of CaB_2O_4 content. As the temperature increases from room temperature to 800 ℃,the friction coefficient of sintered hBN firstly increases and then decreases.
The effects of CaB_2O_4 contents on the microstructure and tribological properties of sintered hBN were studied,in order to promote crystal growth of hBN and decrease it's friction coefficient. The CaB_2O_4 was added into hBN as sintering additive. Then,the h BN with different CaB_2O_4 contents were sintered at 2000 ℃ for 5 h in N_2 ambience. The phase analysis,microstructure and tribological properties of the sintered hBN were studied by XRD,SEM and high-temperature tribometer. The tribological mechanism of sintered hBN was also discussed. The results show that the sintered hBN has a plate-like shape. The diameter of sintered hBN increases from 0. 5-2 μm to 2-4. 5 μm,meanwhile the thickness increases from 100 nm to 200 nm,with the increase of CaB_2O_4 content from 0% to 15%,which indicate that the addition of CaB_2O_4 as sintering additive can effectively promote crystal growth of hBN at 2000 ℃for 5 h in N_2 ambience. The friction coefficient of sintered h BN decreases with the increase of CaB_2O_4 content. As the temperature increases from room temperature to 800 ℃,the friction coefficient of sintered hBN firstly increases and then decreases.
引文
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[12]Yoshitsugu K,Toshiaki W,Kazumi O,et al.Boron nitride as a lubricant additive[J].Wear,1999,232(2):199-206.
[13]叶乃清,曾昭明,胡晓清,等.BN-YAlON复合陶瓷的烧结行为[J].硅酸盐学报,1998,26(2):265-269.
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