碳对FeCr合金粉末的烧结机制和烧结颈长大行为的影响研究
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摘要
采用雾化Fe-15Cr粉末,在粉末中添加石墨,研究不同碳含量和烧结时间在烧结早期对粉末烧结颈生长速率的影响。实验结果表明,随着Fe-Cr粉末中碳含量的提升和烧结时间的延长,烧结颈的尺寸增大,长大速度加快,理论分析,烧结初期烧结颈的主导扩散机制为表面扩散;增加碳含量并没有改变其扩散机制,但是碳能降低铁基合金的熔点,是物质迁移更加容易,显著提高烧结颈的尺寸和表面扩散扩散系数。碳含量为0.07 wt.%的扩散系数为0.91×10-11;当碳含量增加到0.39 wt.%时,扩散系数提高到2.90×10-11。
The atomized Fe-15 Cr powder were used to add graphite to the powder to study the effect of different carbon content and sintering time on the growth rate of the sintered neck of the powder at the early stage of sintering. The experimental results show that with the increase of carbon content in Fe-Cr powder and the prolongation of sintering time, the size of the sintered neck increases and the growth rate increases. Theoretical analysis shows that the dominant diffusion mechanism of the sintered neck at the initial stage of sintering is surface diffusion; The content does not change its diffusion mechanism, but carbon can lower the melting point of the iron-based alloy, which is easier to migrate. It significantly increase the size of the sintered neck and the surface diffusion coefficient. The diffusion coefficient of carbon content of 0.07 wt.% is 0.91×10-11; when the carbon content is increased to 0.39 wt.%, the diffusion coefficient is increased to 2.90×10-11.
The atomized Fe-15 Cr powder were used to add graphite to the powder to study the effect of different carbon content and sintering time on the growth rate of the sintered neck of the powder at the early stage of sintering. The experimental results show that with the increase of carbon content in Fe-Cr powder and the prolongation of sintering time, the size of the sintered neck increases and the growth rate increases. Theoretical analysis shows that the dominant diffusion mechanism of the sintered neck at the initial stage of sintering is surface diffusion; The content does not change its diffusion mechanism, but carbon can lower the melting point of the iron-based alloy, which is easier to migrate. It significantly increase the size of the sintered neck and the surface diffusion coefficient. The diffusion coefficient of carbon content of 0.07 wt.% is 0.91×10-11; when the carbon content is increased to 0.39 wt.%, the diffusion coefficient is increased to 2.90×10-11.
引文
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[19]张剑平,左红艳,罗军明,刘长虹.微波场中铜粉烧结颈形成和晶粒长大动力学[J].材料热处理学报,2018,39(06):118-123.
[20]曾德麟.烧结理论的发展[J].中南矿冶学院学报,1979(02):102-117.
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[2]Barriere T,Gelin J C,Liu B.Experimental and numerical investigations on properties and quality of parts produced by MIM[J].Powder Metallurgy,2001,44(3):228-234.
[3]Brouwer W D,Herpt E C F C V,Labordus M.Vacuum injection moulding for large structural applications[J].Composites Part A Applied Science&Manufacturing,2003,34(6):551-558.
[4]Christian G Kukla.Micro Injection Moulding[J].International Journal of Forming Processes,2001:253-267.
[5]宋久鹏,柳葆生.金属注射成形烧结工艺的试验与数值模拟[J].机械工程学报,2008,44(8):157-163.
[6]果世驹.粉末烧结理论[M].冶金工业出版社,1998:37-42.
[7]Kearns M A,Tingskog T A,Coleman A J,et al.A Study of Microstructure and Mechanical Properties of Metal Injection Moulded HK-30[J].Journal of Minerals&Materials Characterization&Engineering,2008,07(2):127-145.
[8]赖和怡.烧结与扩散——在烧结过程中通过扩散机构的物质迁移[J].稀有金属材料与工程,1978,16(2):3-24.
[9]Gale W F.Smithells Metals Reference Book[M].Chennai,India:T.C.Totemeier,2004:1009.
[10]臧鑫士.17-4PH不锈钢的力学性能[J].航空制造工程,1996,15(5):21-22.
[11]Mirzadeh H,Najafizadeh A. Aging kinetics of 17-4 PH stainless steel[J].Materials Chemistry&Physics,2009,116(1):119-124.
[12]李益民,李云平.金属注射成形原理与应用[M].中南大学出版社,2004.
[13]李龙,李晓.碳在热轧316L、310S奥氏体不锈钢-0.16%C Q345钢复合板界面的扩散行为[J].特殊钢,2017,38(05):1-4.
[14]梁静,李来平,奚正平,等.TZM合金真空烧结脱氧的机制分析[J].稀有金属材料与工程,2011,40(6):987-990.
[15]黄培云.粉末冶金原理[M].冶金工业出版社,1997:267-268.
[16]王崇琳.扩散方程解和烧结材料中合金元素的分布[J].粉末冶金材料科学与工程,2006(02):79-84.
[17]Demirskyi D,Agrawal D,Ragulya A.Neck growth kinetics during microwave sintering of copper[J].Scripta Materialia,2010,62(8):552-555.
[18]胡赓祥,戎咏华.材料科学基础[M].上海交通大学出版社,2010:136.
[19]张剑平,左红艳,罗军明,刘长虹.微波场中铜粉烧结颈形成和晶粒长大动力学[J].材料热处理学报,2018,39(06):118-123.
[20]曾德麟.烧结理论的发展[J].中南矿冶学院学报,1979(02):102-117.
[21]薄占满.烧结初始阶段的扩散机构浅谈[J].硅酸盐,1981(03):46-51.
[22]司新国,鲁雄刚,李传维,等.铁精粉氧化过程的动力学研究[J].北京科技大学学报,2010,32(7):905-909.