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中南大学学报(自然科学版)

Journal of Central South University

第36卷    第2期    总第162期    2005年4月

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文章编号:1672-7207(2005)02-0179-04
钛金属固体法渗硼新技术
贾宝平1,贺跃辉1,汤义武2,刘业翔3

(1.中南大学粉末冶金国家重点实验室,湖南长沙,410083;
(2.长沙力元新材料股份有限公司,湖南长沙,410100;
3.中南大学冶金科学与工程学院,湖南长沙,410083
)

摘 要: 对传统固体粉末法渗硼工艺进行改进,用B4C和无水Na2B4O7代替非晶态硼作为供硼剂,制备出以TiB2为主要成分的表面渗层,并研究了原料成分和反应条件对渗层相结构及厚度的影响。研究结果表明:渗硼剂配料中Na2B4O7和B4C的质量分数比对渗层有很大影响,当w(Na2B4O7)∶w(B4C)=2∶6时,渗层厚度和表面清洁程度等综合性能最优;填充剂Al2O3能导致TiB2渗层脱落,且脱落程度随Al2O3含量的增加而加重;渗层厚度随处理时间的平方根呈线性增加;渗硼层厚度与试验温度的关系为d=aT2+bT+c。

 

关键字: 钛;硼化钛;渗硼;固体粉末法

New Technique of Pack Boronizing of Titanium
JIA Bao-ping1, HE Yue-hui1, TANG Yi-wu2, LIU Ye-xiang1

1.State Key Laboratory of Powder Metallurgy, Central South University,
 Changsha 410083, China;
2.Changsha Lyrun New Material Corporation Limited, Changsha 410100, China;
3.School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

Abstract:Using B4C and anhydrous Na2B4O7instead of amorphous boron as the boron offer, the boride layer of TiB2was prepared in the pack boronizing method. Effects of powder component and experiment condition on the phase structure and thickness of boride layer were discussed.The results show that the mass ratio of Na2B4O7 to B4C has an obvious effect on the performance of layer. Whenw(Na2B4O7)∶w(B4C)=2∶6, the integrative performance of boride layer is the best as for as the thickness and cleanliness are concerned. The Al2O3padding makes the layer desquamate from the matrix. With the heat-treatment time extending,the thickness of layer has linear relation with the square root of time. And the relationship between the thickness and the temperature can be given byd=aT2+bT+c.

 

Key words: Ti; TiB2; boronizing; pack boronizing method

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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