In modern microelectronics and precision manufacturing, silicon wafers and diamond clad copper sheets are widely used due to their unique physical and chemical properties. Silicon wafers, as the basic material for semiconductor devices, have good electrical conductivity and thermal stability; while diamond copper-clad laminates combine the high hardness of diamond with the good electrical conductivity and thermal conductivity of copper, and are widely used in high-performance heat sinks and electronic packages. However, the high hardness of these materials and the stringent requirements for machining accuracy make traditional machining methods face many challenges. In this paper, we will discuss the properties of these two materials and the limitations of their traditional machining methods, and introduce how laser processing technology using customized hard material laser cutting equipment combined with coaxial blowing systems can overcome these challenges.
Material Properties and Traditional Processing Difficulties
Silicon wafers: Silicon wafers of different thicknesses exhibit different characteristics during processing. Thin silicon wafers are fragile and easily deformed, while thick silicon wafers are harder and have higher requirements for surface flatness.
Figure 1 Laser processing and surface morphology of silicon wafers
Diamond-copper clad wafer: Composite of diamond particles and copper matrix, combining the high hardness of diamond and the good electrical and thermal conductivity of copper. Its extremely high hardness and complex structure make it difficult to realize high-quality cutting and drilling by traditional processing methods.
Fig. 2 Sample of diamond clad copper sheet
Traditional processing methods, such as mechanical cutting and drilling, have the following problems:
1. Edge damage: mechanical stress leads to edge breakage, affecting the subsequent process.
2. Low processing efficiency: it is difficult to meet the needs of mass production.
3. Poor adaptability: poor processing results for ultra-thin or complex shape products.
The advantages of laser processing
Laser processing technology with its non-contact operation, high-precision positioning capabilities and flexibility for the processing of silicon wafers and diamond copper-clad sheet provides a new solution:
1. High precision: by precisely controlling the energy distribution of the laser beam, it can realize micron or even nanometer level fine processing.
2. Reduced material damage: laser processing significantly reduces the impact on surrounding materials and protects structural integrity.
3. Increase productivity: Highly automated laser systems support continuous operation modes, dramatically reducing processing cycles.
4. Enhanced adaptability: Whether for thin or thick silicon wafers, or complex diamond clad copper sheets, the laser can flexibly adjust its parameters to suit a wide range of processing needs.
In addition, the use of customized laser cutting equipment for hard materials in combination with coaxial air blowing system can ensure the quality of the process while further improving efficiency. Coaxial air blowing not only helps to cool the area of effect, but also effectively removes the debris generated, keeping the processing environment clean and ensuring a smoother process.
Fig. 3 Square Cutting and Cutting Face of Silicon Wafer
Fig. 4 Circular Wafer Cutting and Square Array Cutting
Fig. 5 Cutting end surface topography of diamond clad copper wafer
In summary, for silicon wafers and diamond copper cladding such as high hardness materials, the use of laser processing technology with advanced auxiliary equipment can not only solve the many problems that exist in the traditional method, but also greatly improve production efficiency under the premise of ensuring product quality. With the continuous progress and improvement of related technologies, laser processing will play an important role in more fields, promoting the development of microelectronics and precision manufacturing technology.
