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相关概念视频

Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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相关实验视频

Updated: May 3, 2026

Ultrasonic Welding of Thermoplastic Composite Coupons for Mechanical Characterization of Welded Joints through Single Lap Shear Testing
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通过优化工艺参数和低频振动辅助来提高屏蔽金属弧的性能.

Rajeev Ranjan1, Manoj Kumar2, Sachin Rathore3

  • 1Department of Mechanical Engineering, Sarala Birla University, Ranchi, India.

Scientific reports
|November 14, 2025
PubMed
概括
此摘要是机器生成的。

低频振动辅助接增强了温钢的性能. 优化的参数通过精致的微观结构显著提高了硬度,抗拉力和冲击强度,证明了对高质量接的有希望的技术.

关键词:
低频振动辅助接过程中的低频振动辅助接过程.机械特性 机械特性温钢是一种温和的钢.响应表面的方法 响应表面方法

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Last Updated: May 3, 2026

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科学领域:

  • 材料科学 材料科学 材料科学
  • 机械工程 机械工程
  • 制造过程 制造过程 制造过程

背景情况:

  • 振动辅助接是一种获得优质接质量的技术.
  • 之前的研究集中在用于机械增强的中高频率.
  • 低频应用在优化接性能方面仍未得到充分探索.

研究的目的:

  • 研究和优化低频振动辅助接的工艺参数.
  • 为了增强软钢接中的硬度,抗拉强度和冲击强度等机械性能.
  • 在这个过程中确定影响接质量的关键因素.

主要方法:

  • 使用低频 (100 Hz) 振动辅助的屏蔽金属弧接 (SMAW).
  • 采用Taguchi方法与L27直角数组进行参数优化.
  • 使用响应表面技术优化接电流,振动时间和频率.
  • 进行扫描电子显微镜 (SEM) 用于微观结构分析.

主要成果:

  • 振动频率被确定为硬度,拉力和冲击强度的最关键因素.
  • 优化的参数 (120 A,100 Hz,60 秒) 产生了最大硬度 (97.16 RHN) 和更好的冲击强度.
  • 通过低热量输入,100Hz频率和100s振动时间,可以实现最佳拉伸强度.
  • 由于池激发,SEM分析显示了接区的精细微观结构.

结论:

  • 低频振动辅助接有效提高温钢的机械性能.
  • 优化的工艺参数显著提高了接硬度,抗拉力和冲击强度.
  • 通过接池激发微观结构的改进是提高性能的关键.