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スラリーディッピング法による管状傾斜機能材料の試作評価

Fabrication and evaluation of the tubed functionally gradient material by slurry dipping

渡辺 龍三*; 川崎 亮*

Watanabe, Ryuzo*; not registered

ORR-SHEBY-DORN法を改良してクリープ破断データを解析する手法を提案した。この方法を用いて改良SUS316鋼(55MKと55MS) のクリープ破断データを解析した結果、この破断テータは温度・応力依存性の異なるいくつかの領域に区分する必要があることが明らかになった。また、この材料で得られているクリープ曲線の解析から、クリープ変形および破断挙動の異なる3つの領域が存在することが確認された。改良SUS316鋼のクリープ曲線データを改良$$theta$$法で解析し、長時間クリープ曲線と破断寿命を予測するための構成式が得られた。この式を使うことにより、改良SUS316鋼の複雑な破断特性を合理的に理解することができた。

This report is the PNC contract research for fiscal year of 1993 titled "Formation of Ti/SUS/Mo graded layer by slurry dipping." Fuel sheath material for FBR is used under a severe enviroment. The life of conventionally used SUS316 is known to be only two years. The development of long-life core material having high temperature strength, radiation resistance and anti-corrosion property is now essential. To create a super-long-life core materials for FBR it seems promising to employ the concept of functionally gradient material, in which these different materials are configurated with grading : as base material is used SUS316 stainless steel, the inner wall is made of Ti for the radiation resistant and anti-corrosion property with graded intermediate layers towards the base metal and the outer shell is the graded Mo layer for the corrosion resistance against liquid sodium. The shape of the core tube is a long cylindrical tube and its dimensions are 8.5mm in outer diameter, about 2m in length, shell thickness is 0.5mm and the thickness of the gradient layer is about 0.1mm. However, we have not yet acquired sufficient techniques to realize such shape and dimmensions, and the investigation is planned to get basic informations on the processing of the core materials with graded structures. Slurry dipping has been employed for forming a graded layer on curved inner and outer surfaces. And it is indispensable that the graded layers have showed sufficient thermal-stress relief function, as well as good bonding capability. In this year (FY 1993), the formation of the graded inner layer of Ti/SUS316 by slurry dipping was investigated. The formation procedure is briefly mentioned here as follows. Cylindrical green compacts of SUS304 stainless steel powder was prepared by die compaction and CIP as a substrate for slurry dipping. A coarse Ti powder was suspended in ethanol and milled by tumbler ball mill to get a slurry having an appropriate viscosity for dipping. The ...

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