• CN:11-2187/TH
  • ISSN:0577-6686

›› 1980, Vol. 16 ›› Issue (4): 47-66.

• 论文 • 上一篇    下一篇

在铁-碳熔体中石墨的生长

陈熙琛;易孙圣;王祖仑;陈希成;贾顺连   

  1. 中国科学院物理研究所
  • 发布日期:1980-09-01

Graphite Growth in Iron-Carbon Melt

Chen Sysen;Yi Sunsheng;Wang Zulun;Chen Sychen; Jia Shunlian   

  1. Chinese Academy of Sciences
  • Published:1980-09-01

摘要: 本工作用热解石墨做籽晶在F e-C、F e-C-S、F e-C-S-C e合金熔体中生长。观察(0001)和(1010)晶面外延生长层的组织。用离子腐蚀法显示{0001}晶面族的取向。对从熔体中提拉出来的外延层表面进行形貌分析和X-射线衍射。本工作获得的有关在F e-C熔体中石墨生产机理的新结果验证了笔者在[11]中提出来的模型。本工作指出S、O等表面活性元素干扰微弱的情况下,石墨晶体按[0001]和[1010]晶向的生长速度相接近。但是,生长方式有所不同,按[0001]方向是以螺旋晶方式生产,而按[1010]方向则以板状树枝晶方式生产,并有一些晶体发生扭转而改变其生长方向为[0001]。S的干扰使(0001)晶面上的若干螺旋晶受到封锁,而另一些未被封锁的螺旋晶则取倾斜错开的方式分叉生长。以(1010)晶面为基底生产的晶体,因S的干扰(抑制作用)而不稳定,呈孪晶面方式改变其生长方向。C e的球化作用在于与S、O化合而牵制它们。此外,本工作还发现,球化元素还促使石墨按[0001]方向生产的晶体强烈分枝并呈“小角簇”螺旋生长;抑制石墨在[1010]方向的生长,并扭转其生长方向使之按[0001]方向生长。这些生长方式均导致球状晶的形成。

Abstract: Graphite crystales were grown in the melts of Fe-C, Fe-C-S and Fe-C-S-Ce alloys, with pyrolytic graphite as the seed. The microstructure of the layers between the epitaxially grown plane and the (0001)an:d (1010) crystal planes were studied "The orientation of the (0001) crystal plane :was determined by means of ionetching techniques and the surface of the epitagial layer was investigated by topography and x-ray diffraction analysis. A new result regarding the growth mechanism of graphite in Fe-C alloy has been obtained, which supports the model propsed earlier by the authors.In this paper it is remarked that the rate of growth for both (0001) and (1010) graphite crystals are nearly the same .when there is no interference: from activated elements such as S,o etc. However, the forms of their growth Fare different: Growth in the (0001) direction is spiral,whereas growth in the (1010) is in the form of flat dendritic crystals,and some crystals even change their growth into the (0001) direction. Interference from S, blocked some of the (0001) plane spiral crystals and other spiral crystals grew tilted and staggered. Growth based on the (1010) plasne is unstable because of blocking. Action from Sand most of them change their growth direction to that of the :twin -crystal plane. The spheroidisation effect of Ce is to combine with the S and O- as a consequence restraining them both.It has also been found that after adding rapid splitting and spiral` growth of crystals based on the (0001) plane occurs like a bunch of crystals tilted at a small angle with one another In the course of growth these crystals progressively change their orientation thus becoming spherical. The crystal plane (1010) is restrained on addition of Ce and changes its orientation immediately .This also leads to spherical growth.