New Coating & Metallizing Process of Refractory Metals & Compound in Molten Salt Bath

新涂层

• 批准号: 15360401
• 负责人: TAKENAKA Toshihide
• 金额: $ 8.77万
• 依托单位: TOYOHASHI UNIVERSITY OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15360401/
• 关键词: Ti; disproportionation; coating; electroless plating; molten salt; steel; corrosion resistance; Mo; チタン合金; 炭素鋼; クロム; 析出; NaCl-KCl; 鋼; ステンレス鋼; 温度変化; フッ化物

Coating and metallizing of refractory metal or its compound by using a disproportionation reaction in molten salt has been studied. Titanium coating in NaCl-KCl equi-molar melt with Ti chloride or fluoride at 1000-1200K was mainly examined in this study. The results are summarized as follows ;1) The effects of some factors on the disproportionation reaction were clarified theoretically and experimentally. Titanium can be deposited by temperature change owing to the shift in the equilibrium. Titanium alloy coating should also be expected in the case that the substrate can form Ti alloy. Addition of fluoride in the bath may improve the rate of Ti deposition.2) Titanium metal deposited on alumina substrate by the simple immersion for hours, while Ti compound was seen on quartz glass substrate. These deposits seemed particle-like, and a dense coating layer wasn't obtained. The temperature gradient in the bath seemed effective in the improvement in the deposition rate.3) Dense and coherent Ti alloy layers up to 100μm were formed on Fe, Ni and carbon steel. The layer consisted of some layers with different composition, and almost the same Ti alloy layer was obtained in the bath with TiCl_8 and K_2TiF_6. The change in the formation rate indicated that the diffusion of the elements in the formed layer controlled the formation rate of the layer. Corrosion resistance of steel against saline was remarkably improved by our Ti alloy coating. A dense and coherent Ti metal layer of a few μm was obtained on stainless steel, and Cr seemed to influenced the peculiar behavior of stainless steel. Deposition in LiCl-KCl eutectic melt at lower temperature was also tried in this study, but enough Ti deposit wasn't obtained.4) MoO_2 was deposited on metal substrates in the melt with K_2MoO_4, while no deposit was obtained on ceramic.

本文研究了在熔盐中利用沉淀反应对难熔金属或其化合物进行包覆和金属化。本文主要研究了在1000- 1200 K温度范围内，氯化钛和氟化钛在NaCl-KCl等摩尔熔体中的钛涂层。主要研究结果如下：1）从理论和实验两方面阐明了一些因素对反应的影响。由于平衡的移动，钛可以通过温度变化来沉积。在基体能形成钛合金的情况下，也应该期望钛合金涂层。在镀液中添加氟化物可以提高钛的沉积速率。2）简单浸泡几个小时后，在氧化铝基体上沉积了金属钛，而在石英玻璃基体上则出现了钛化合物。这些沉积物似乎是颗粒状的，并且没有获得致密的涂层。镀液中的温度梯度对提高沉积速率是有效的。3）在Fe、Ni和碳钢表面均形成了厚度达100μm的致密、共格的Ti合金层。在镀液中加入TiCl_8和K_2TiF_6，可获得成分基本相同的钛合金层。形成速率的变化表明形成层中元素的扩散控制了层的形成速率。钛合金涂层显著提高了钢的耐盐腐蚀性能。在不锈钢表面获得了一层厚度为几μm的致密的Ti金属层，Cr对不锈钢的特殊性能有一定的影响。本研究还尝试了在较低温度下在LiCl-KCl共晶熔体中沉积，但没有获得足够的Ti存款。4）在含K_2MoO_4的熔体中，MoO_2沉积在金属基体上，而在陶瓷基体上没有获得存款。

项目成果

Toshihide Takenaka, Masahiro Kawakami, Naoyuki Suda: "Dependence of Titanium Deposition upon Its Ionic State in Molten Salt"Materials Science Forum. 449-452. 453-456 (2004)

Toshihide Takenaka、Masahiro Kawakami、Naoyuki Suda：“钛沉积对其在熔盐中离子态的依赖性”材料科学论坛。

Coating of Ti and Ti Alloys by disproportionation Reaction in Molten Salt

熔盐中歧化反应涂覆钛及钛合金

• 发表时间: 2005
• 期刊: Proceedings of 7th International symposium on Molten Salts Chemistry & Technology Vol.1
• 作者: Toshihide Takenaka;Shunsuke Miyazawa;Masataka Muro;Masahiro Kawakami
• 通讯作者: Masahiro Kawakami

Dependence of Titanium Deposition upon Its Ionic State in Molten Salt

钛沉积对其在熔盐中离子态的依赖性

• 发表时间: 2004
• 期刊: Materials Science Forum vol.499-452
• 作者: T.Takenaka;M.Kawakami;N.Suda
• 通讯作者: N.Suda

溶融塩化物中での不均化反応を用いたチタン合金コーティング

利用熔融氯化物中歧化反应制备钛合金涂层

• 发表时间: 2006
• 期刊: 日本金属学会誌 第70巻2号
• 作者: 室昌孝;宮澤俊輔;竹中俊英;川上正博
• 通讯作者: 川上正博

Coating of Titanium Alloy by Using Disproportionation Reaction in Molten Chloride

熔融氯化物中歧化反应涂覆钛合金

• 发表时间: 2006
• 期刊: J.Japan Inst.Metals vol.70(2)
• 作者: M.Muro;S.Miyazawa;T.Takenaka;M.Kawakami
• 通讯作者: M.Kawakami