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ガスアトマイズ粉末内部の気孔形成メカニズム解明と気孔形成の抑制

阐明气雾化粉末内部的孔隙形成机制并抑制孔隙形成

基本信息

批准号：
21H01663
负责人：
吉年規治
金额：
$ 11.15万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2021
资助国家：
日本
起止时间：
2021-04-01 至 2024-03-31
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-21H01663/
关键词：
Gas-atomized powder porosity synchrotron X-ray computed tomography hydrogen gas-atomized powder

项目摘要

1年目には合金の種類による差異を明らかにする目的で，主成分の異なる合金系を用いて差異を調査したが，2年目は，主成分は同じであるが含まれる成分比の異なる合金組成により内部気孔量やその形態が異なるかどうかについて調査を行うことを目的とした．そこで，Cu合金を用いて融点，液相線温度，固液共存温度域の異なる複数の成分組成の合金を作製し，その後ガスアトマイズ法により粉末化を行った．得られた粉末試料を放射光X線CTにより内部気孔の直接観察を行った．CTにより得られた3次元モデルの解析にはより観察領域を広くすることが必要であると考えられたため，画像解析アルゴリズムを新たに構築し，短時間で効率よくより大きな対象領域を解析できるようにした．具体的には，断面画像中に含まれるアーチファクトに起因するコントラストを補正する処理や，輪郭の明瞭化処理などを新たに加え，精度の向上と同時に処理効率の大幅な増強を図った．これらの解析の結果から，内部に含まれる気孔の量はその成分組成の違いにより大きな差が見られることが確認され，また気孔の寸法にも差が見られた．今後は得られた粉末粒子および気孔の寸法・形状などの情報からその形成メカニズムに関わる要素を検討する予定である．ガスアトマイズ装置については，2022年度中に東北大学から九州大学へ移設を行い，より高い頻度でアクセスできるようになった．また，装置の仕様については，水素ガスを混合したガスを取り扱えるように1年目に導入した酸素濃度計に加えて，露点計の導入を行い噴霧ガス中の酸素分圧と水分子分圧比の測定も行える仕様とした．

In one year, the main component of the alloy system is the same as that of the alloy. The composition of the alloy is the same as that of the alloy. The content of the alloy is the same as that of the alloy. The content of the alloy is the same as that of the alloy. The content of the alloy is higher than that of the alloy. The morphology of the alloy is the same as that of the alloy. The temperature of the alloy is much higher than that of the alloy. The main component is the same as that of the alloy. The content of the alloy is the same as that of the alloy. The content of the alloy is the same as that of the alloy. The content of the alloy is different from that of the alloy. Liquid line temperature, solid-liquid coexistence temperature domain, temperature range, temperature domain, temperature domain, temperature domain, In the end, the powder method was used. The powder material was obtained. X-ray CT X-ray examination of the internal holes was performed directly. Ct images were obtained in three dimensions. In the field of inspection, it is necessary to test the image, and to analyze the portrait. The short-time response rate is very high in the field of image analysis. Specifically, the cross-sectional picture contains the cause of the error in the cross-sectional portrait. The cause of the error is correct, and the accuracy is greatly enhanced. The results of the analysis are greatly enhanced. The content of the hole in the interior is determined by the composition of the component, which makes it clear that the size of the hole is different. In the future, the powder particles, the shape of the hole, the shape of the hole, the size of the hole, the shape of the hole, the size of the hole, the size of the hole, the shape of the hole, the size of the hole, the size of the hole, the shape of the hole, the shape of the hole, the size of the hole, the shape of the hole, the size of the hole, the shape of the hole, In 2022, Beijing University, Beijing University, Kyushu University, Kyushu University, Beijing University, Beijing University, Kyushu University, Kyushu University, Beijing University, Kyushu University, Kyushu University, Beijing University, Kyushu University, Kyushu University, Beijing University, Kyushu University, Beijing University, Kyushu University, Kyushu In the dew point measurement, the acid fraction and the water molecular fraction are higher than those in the determination line.