用核方法研究β-氧化铝陶瓷

A STUDY OF BETA-ALUMINA CERAMICS BY NUCLEAR REACTIONS

用(P,P′γ)和~1H(^(15)N,αγ)^(12)C反应以及He^+离子背散射方法分析了β-氧化铝陶瓷样品。结果表明,其近表面区域Na/Al比值为0.07-1.16;O/Al比值为1.23-4.33。钠含量平均比单晶体多33％,锂浓度与原料中的锂量一致,钠和锂的分布均有不对称性。样品的吸水效应具有可逆性,水沾污直接影响表面区的钠含量和浓度分布。这种无破坏性的定量测量方法可以成β-氧化铝陶瓷配方和制造工艺最佳化的快速检测手段。

(p, p'γ) and^1H (^(15)N, αγ)^(12)C reactions as well as He^+ backscattering tech- nique is used to analyze beta-alumina caramic specimens. The results show that in the near surface region, the Na/Al ratio varies from 0.07 to 1.16 and the O/Al ratio from 1.23 to 4.33. On average, sodium content is 33% more in ceramics than in monocrystals, while the lithium concentration is in agreement with those in the raw material. Somewhat asymmetry is found in the concen- tration distributions of both sodium and lithium at concave and convex sides. The absorption of water in beta-tubes can be reversible and gives measurable effect on the sodium content and distrabution. The results also suggest that such a nondestructive, quantitative technique can be used as a quick way to monitor and optimize the composition and fabrication procedures of beta-alu- mina ceramic tubes.