成果報告書詳細
管理番号20160000000336
タイトル*平成27年度中間年報 エネルギー・環境新技術先導プログラム 高温岩体発電に向けた超耐食タービンのためのマルチビームレーザ表面改質の研究
公開日2016/6/22
報告書年度2015 - 2015
委託先名富士電機株式会社 国立大学法人大阪大学接合科学研究所
プロジェクト番号P14004
部署名イノベーション推進部
和文要約
英文要約Title: Advanced Research Program for Energy and Environmental Technologies / Research of a Multi-beam laser surface treatment for ultra corrosion-resistant turbine to realize the hot dry rock geothermal power generation. (FY2014-FY2016) FY2015 Annual Report

The objective of this research is to develop corrosion protection coating technology for ultimate environment of hot dry rock geothermal gas and three-dimensional double-curved surface of turbine blades.
This technology is necessary for practical realization of the hot dry rock geothermal plants which can make high-degree application of energy of deep hot dry rocks.
in order to innovate this technology, it is necessary to minimize HAZ (heat affected zone) of coating ,because HAZ is the reduction factor of corrosion resistance.
In order to solve this problem, we research a laser cladding technique for minimizing HAZ by using a multi-stage heat input by the coordinated control with multi-beam.
We research the following items
1. Development of coating material that can both corrosion resistance and cladding characteristics
2. Development of monitoring method of a laser heating section, and a multi-beam coordinated control algorithm
3. Optimization of laser power and temperature profiles for minimizing HAZ, and Melting surface of cladding layer

It shows development of coating layer structure and coating materials as an outline of the research results of the 2015 fiscal year.
Turbine blades are exposed to severe corrosion and erosion environment . So, the ceramic materials are optimal for corrosion and erosion resistance because ceramic meterials have high corrosion resistance and hardness. However , the pores is generated in a typical ceramic coating .These pores become penetration passes for the corrosive components. So , it was selected composite cladding layer structure that fill the pores of the ceramic coating by a binder material which is corrosion-resistant alloy. it was selected Tungsten carbide and Hastelloy as a composite laser cladding materials for corrosion and erosion-resistant coating. because Tungsten carbide and Hastelloy expected to have corrosion resistance for deep geothermal environment.
As the result of composite cladding performed by diode laser and WC and Hastelloy were mixed in any proportion, cladding layer with no pores was formed. The hardness of the composite cladding layer is 600 Hv,and it satisfies the 500Hv that is target value. Then corrosion test was carried out in the environment that simulates the harsh deep geothermal steam (pH2.0, Cl concentration).
As the result of corrosion test, the corrosion amount of composite cladding layer is 1/5 compared with the base material 13 Chromium steel. This result is greater than1/2 of target value. So, It was possible to form a cladding layer having corrosion resistance in excess of the target value.
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