Synthesis of metal silicides using alkali metals and their thermoelectrical properties

碱金属金属硅化物的合成及其热电性能

• 批准号: 20685015
• 负责人: YAMADA Takahiro
• 金额: $ 15.89万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (A)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20685015/
• 关键词: 無機合成; 材料合成プロセス; 熱電変換材料; 金属シリサイド; 金属ケイ化物; ナトリウム; 低温合成; 高温構造材料; 準安定相; 耐酸化被膜; 鉄シリサイド; 低温焼結; 熱電材料

Powder and bulk of thermoelectric metal silicides such as β-FeSi_2,MnSi_<1.7+δ>, CoSi, CrSi_2,and Mg_2Si were prepared by heating mixtures of Si and metal powders or Si powders and compact body of metal powders with Na at low temperatures (500-900℃). Thermoelectric properties of the prepared metal silicides were characterized. The existence of Na-Si melt above ca. 500℃ was revealed by the study of Na-Si phase diagram. It indicates that the metal silicides are prepared by a reaction of Si (liquid) in the melt with the metals (solid). Powder of high-melting point metal silicides such as α-MoSi_2and NbSi_2,and metastable phase β-MoSi_2were prepared at 800,627,and 600-C, respectively. NbSi_2layer, which has oxidation resistance, was fabricated on the surface of Nb plate by heating the Nb plate with Si powder and Na. It was demonstrated that the new preparation method using Na can be adopted for the low-temperature preparation of metal silicides.

用Si粉与金属粉的混合物或Si粉与金属粉的压坯在低温（500-900℃）下加热，制备了β-FeSi_2、MnSi_（1.7+δ）、CoSi、CrSi_2和Mg_2Si等热电金属硅化物的粉末和块体。对所制备的金属硅化物的热电性能进行了表征。Ca.通过对Na-Si相图的研究，揭示了500℃的温度范围。这表明金属硅化物是通过熔体中的Si（液体）与金属（固体）反应制备的。分别在800 ℃、627 ℃和600 ℃制备了高熔点金属硅化物（α-MoSi_2和NbSi_2）粉末和亚稳相β-MoSi_2。采用Si粉和Na粉加热Nb板的方法，在Nb板表面制备了具有抗氧化性能的NbSi_2层。实验结果表明，采用Na作为原料的新制备方法可以用于金属硅化物的低温制备。

项目成果

Preparation of β-FeSi_2 and MnSil_<1.7+δ> Bulks from Metal Compact Bodies Using a Na-Si Melt and Their Thermoelectric Properties

Na-Si熔体金属致密体制备β-FeSi_2和MnSil_<1.7+δ>块体及其热电性能

• 发表时间: 2010
• 作者: T.Yamada.E.Kariya;H.Morito;Y.Miyazaki;J.Takahashi;H.Yamane
• 通讯作者: H.Yamane

Na-Si融液を用いたNb板へのNbSi_2コーティング被膜の作製

Na-Si熔体在铌板上制备NbSi_2镀膜

• 发表时间: 2010
• 作者: 佐藤裕人;山田高広;森戸春彦;山根久典
• 通讯作者: 山根久典

Preparation of Bulk β-FeSi2 Using a Na–Si Melt

使用 Na-Si 熔体制备块状 β-FeSi2

• DOI: 10.1143/jjap.48.100209
• 发表时间: 2009
• 期刊: Japanese Journal of Applied Physics
• 影响因子: 1.5
• 作者: Takahiro Yamada;H. Morito;H. Yamane
• 通讯作者: H. Yamane

Preparation of polycrystalline bulk Mg2Si by using NaSi

• DOI: 10.1007/s10853-009-3773-4
• 发表时间: 2009-08
• 期刊: Journal of Materials Science
• 影响因子: 4.5
• 作者: Takahiro Yamada;Y. Oishi;H. Morito;H. Yamane

Pressure-less preparation of polycrystalline β-FeSi_2 bulk with a Na melt

Na熔体无压制备多晶β-FeSi_2块体

• 发表时间: 2009
• 作者: 山田高広;et al.
• 通讯作者: et al.