摘要
研究了不同影响因素对GCr15高碳钢固体粉末包埋渗铝后渗铝层表面、截面及厚度的影响.通过调整渗铝温度、时间、Al粉含量、NH_4Cl含量来观察渗铝后试样表面状况,以确定最佳渗铝工艺.利用扫描电子显微镜观察了渗铝层截面的微观形貌;利用测厚仪测量渗层的厚度值.结果表明:随渗铝温度的升高、渗铝时间的延长以及Al粉含量的增加,渗铝层的厚度均呈现先增大后逐渐平缓的趋势;当催化剂NH_4Cl含量添加为2.5%时,所得渗层表面平整洁净.采用Al粉含量为25%、NH_4Cl含量为2.5%、850℃、3 h工艺渗铝后,渗铝层的厚度达到70μum以上,表面平整.
The effects of pack aluminization process parameters on aluminization layer surface,cross-section of aluminization layer and thickness on GCr15 steel were studied. The optimum process were determined by changing the aluminization temperature, aluminization time, Al powder content and NH4Cl content. The cross-section morphology of aluminization layer was observed by using the Scanning Electron Microscope（SEM）, and the thickness of aluminization layer was measured by calibrator. The results show that the thickness of aluminization layer follows the tendency of increasing firstly and then changing gently with the growth of aluminization temperature, aluminization time and Al powder content.The smooth and clear aluminization layer was obtained with 2.5% NH4Cl addition. When the content of the aluminization powder was 2.5% the thickness of aluminization layer could go up to more than 70 um under the aluminization technology of 25% Al content, 2.5% NH4Cl content, at 850 ℃ for 3 h aluminization condition, and the surface of the aluminization layer was smooth and clear.
出处
《河北工业大学学报》
CAS
2017年第6期53-59,共7页
Journal of Hebei University of Technology
基金
国家自然科学基金(51501055
51601056)
河北省高等学校科学技术研究项目(Z2013048)
