放电等离子烧结钛酸钡陶瓷的碳污染及脱碳工艺研究

STUDY ON CARBON POLLUTION AND DECARBONIZATION PROCESS OF SPSED BaTiO_3 CERAMICS

为了研究放电等离子烧结钛酸钡陶瓷过程中的碳污染及脱碳工艺,以钛酸钡粉体为原料,用石墨模具,以碳纸为脱模包覆材料,在1150℃、50MPa条件下进行放电等离子烧结。用XRD对脱碳前后烧结体进行物相分析,用能谱仪对不同脱碳时间下的烧结体的碳元素的分布进行线分析,用扫描电镜观察脱碳时间对组织的影响。结果表明：石墨模具会污染钛酸钡烧结体,碳元素沿烧结体半径方向呈梯度分布；脱碳温度为800℃时,保温2小时能够完全除去烧结体内的碳污染,并得到致密、组织均匀的钛酸钡陶瓷。

In order to study the carbon pollution of BaTiO3 ceramic during spark plasma sintering （SPS） and the decarbonization processes, the BaTiO3 with graphite die and paper-like filler was sintered in SPS system at 1150℃. According to X-ray, EDS and SEM result, it can be concluded that the graphite die will pollute the sintered body and the distribution of carbon along the radius direction is gradient, after being held at 800℃ for 2 hours, the carbon pollution in the SPSed body can be completely removed, whereas, the BaTiO3 ceramic will possess high density and homogeneous microstructure.