Investigations on High-Speed PVD technology for deposition of alpha-Al-O+X and Al-Ti-O+X coatings for steel die casting

用于钢压铸件的 α-Al-O X 和 Al-Ti-O X 涂层沉积的高速 PVD ​​技术研究

• 批准号: 269121028
• 负责人: Professorin Dr.-Ing. Kirsten Bobzin
• 金额: --
• 依托单位: Institut für Oberflächentechnik (IOT)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/269121028?language=en
• 关键词: Investigations; Speed; PVD; technology; deposition

The project (sign removed) showed that the economic deposition of thick, oxide based hard coatings is possible by HS-PVD, due to high coating thickness and high deposition rates. In addition to processes for the deposition of amorphous and crystalline (Al,Cr)2O3 and Al-Ti-O coatings, a process concerning the deposition of α-like (Al,Cr)2O3 was developed. The achieved structure of the α-like (Al,Cr)2O3 coatings with high aluminum content and substrate temperatures of T=570 °C still represents a great challenge for conventional PVD technologies. The phase stability of the α-like (Al,Cr)2O3 phase was verified by annealing tests in vacuum up to a temperature of T=800 °C. Nevertheless, the investigations revealed further research demand. The influence of heater on the coating process must be excluded. It must be investigated if it is possible to deposit fully crystalline α-(Al,Cr)2O3 or Al2TiO5 coatings by HS-PVD. It is important to determine the minimal Cr and Ti content, which allows the formation of crystalline α-(Al,Cr)2O3 and Al2TiO5. Thereby, the mechanical properties of the coatings and the adhesion between coating and substrate must be taken into consideration. The analyses of interactions between coating and molten steel and the coating behaviour under thermocyclic load is necessary with regard to the application. The overall objective of the proposed project (sign removed) is the detailed investigation and adaption of the α-like (Al,Cr)2O3 and Ti-Al-O coatings, which were deposited in (sign removed). Processes concerning the deposition of α-(Al,Cr)2O3 and Al2TiO5 coatings with high aluminum contents will be defined. This enables a reduced influence of the alloying elements Cr and Ti on α-Al2O3 phase characteristics. The analyses enable a detailed investi¬gation and adaption of the mechanical and thermal properties as well as the correlation of interlayer characteristics and compound adhesion between substrate and coating. The heater is replaced to avoid an influence on deposition atmosphere, which makes it necessary to adapt the coating processes developed until then. The next step is to determine the minimum Cr and Ti content, which are required to form fully crystalline α-(Al,Cr)2O3 and Al-Ti-O coatings at substrate temperatures below T<660 °C. The influence of interlayer thickness and chemical composition on compound adhesion is investigated to increase adhesion between substrate and oxide hard coating. The application-oriented development of the coatings is based on thermocyclic annealing tests in ambient air, isothermal annealing in vacuum and ambient air as well as immersion tests in steel melt. The microstructural and chemical evaluation before and after application-oriented test series provide essential insights concerning the diffusion and oxidation behaviour as well as thermal cycling capability of the coatings. Furthermore, the compound adhesion and the interaction between steel melt and oxide coatings can be investigated in detail.

该项目（删除的符号）表明，由于高涂层厚度和高沉积速率，HS-PVD可以通过HS-PVD的经济沉积物的经济沉积。除了使无定形和晶体（AL，CR）2O3和Al-Ti-O涂层沉积的过程外，还开发了有关α样（AL，CR）2O3沉积的过程。 T = 570°C的高铝含量和底物温度的α样（AL，CR）2O3涂层达到的结构仍然是常规PVD技术的巨大挑战。通过在真空中的退火测试至t = 800°C的温度，验证了α样（AL，CR）2O3相的相位稳定性。然而，这些投资揭示了进一步的研究需求。必须排除加热器对涂料过程的影响。如果可以通过HS-PVD沉积完全结晶的α-（Al，Cr）2O3或AL2TIO5涂层，则必须研究它。确定最小的Cr和Ti含量很重要，该含量允许形成晶体α-（Al，Cr）2O3和AL2TIO5。因此，必须考虑涂料的机械性能以及涂层和底物之间的粘合剂。对于应用，必须分析涂层与熔融钢之间的相互作用以及在热环负荷下的涂层行为。拟议项目的总体目标（删除符号）是沉积在（删除符号）中的α样（AL，CR）2O3和Ti-Al-O涂层的详细投资和适应。将定义有关α-（Al，Cr）2O3和AL2TIO5涂层具有高铝含量的过程。这使合金元件Cr和Ti对α-Al2O3相特征的影响减少了。分析可以详细的投资和机械和热性能的适应以及层间特性和底物和涂层之间的复合粘合剂的相关性。更换加热器以避免对沉积气氛产生影响，这使得有必要适应在此之前开发的涂料过程。下一步是确定最小Cr和Ti含量，在底物温度低于T <660°C的基板温度下，需要形成完全结晶的α-（Al，Cr）2O3和Al-Ti-O涂层。研究了层间厚度和化学成分对化合物粘合剂的影响，以增加底物和氧化物硬涂层之间的粘合剂。涂料的面向应用的开发基于环境空气中的热环退火测试，真空和环境空气中的等温退火以及钢熔体中的浸入测试。面向应用的测试系列之前和之后的微观结构和化学评估提供了有关涂料的扩散和氧化行为以及热循环能力的基本见解。此外，可以详细研究化合物粘合剂以及钢熔体与氧化物涂层之间的相互作用。