Details

Autor(en) / Beteiligte

• Zhang, Fan
• Zhang, Jinyong
• Leng, Xiaoxuan
• Lei, Liwen
• Fu, Zhengyi

Titel

Thermodynamics analysis of diffusion in spark plasma sintering welding Cr3C2 and Ni

Ist Teil von

• Journal of applied physics, 2017-03, Vol.121 (11)

Ort / Verlag

Melville: American Institute of Physics

Erscheinungsjahr

2017

Quelle

AIP Journals (American Institute of Physics)

Beschreibungen/Notizen

• Spark plasma sintering (SPS) welding of chromium carbide (Cr3C2) and nickel (Ni) was used to investigate the atomic diffusion caused by bypassing current. It was found that the diffusion coefficient with bypassing current was enhanced by almost 3.57 times over that without bypassing current. Different from the previous researches, the thermodynamics analysis conducted herein showed that the enhancement included a current direction-independent part besides the known current direction-dependent part. A local temperature gradient (LTG) model was proposed to explain the current direction-independent effect. Assuming that the LTG was mainly due to the interfacial electric resistance causing heterogeneous Joule heating, the theoretical results were in good agreement with the experimental results both in the present and previous studies. This new LTG model provides a reasonable physical meaning for the low-temperature advantage of SPS welding and should be useful in a wide range of applications.