Three Steps to Laser Marking High-Temperature Resistant Materials

The problem of blackening when using lasers to mark high-temperature materials has troubled many users. The company provides three-step solutions: pre-processing optimization, precise adjustment of parameters, and post-processing of the oxide layer.By means of targeted processing, the laser effectively avoids the problem of oxidation and darkening in the marked area, ensuring a clear and long-lasting mark.

Why does laser marking on high-temperature materials turn black?

Many users of laser marking machines have discovered that when they process high-temperature-resistant materials like ceramics and metal alloys, the surface of the material turns black or even melts.In fact, the color change is caused by the high temperature of the laser beam oxidizing the surface of the material.Don't worry about changing your equipment. Just understand the principle and adjust your methods, and this problem can be completely solved.

Three steps to solve the problem of oxidized black.

Pre-treatment: First, we take off the makeup.

Don ’ t underestimate the importance of cleaning before laser marking! High-temperature materials ’ surfaces often have oil stains, oxidation, or residues from processing.It is recommended that after wiping the area with ethanol, the area be lightly sanded with 400-grit sandpaper.This step reduces the carbonization of the material, and serves as a cushion, allowing the laser energy to be more evenly distributed when the marking is done.

Parameter adjustment: Find the "gentle mode" of the laser.

You can't just crank up the power to its maximum setting and start marking. For example, for ceramics, it is recommended to start testing at 30 % power, speed at more than 800mm / s, and frequency at around 20kHz.Different materials require repeated testing in order to observe the degree to which they turn black.Remember the rule of thumb: low power and high speed will effectively reduce heat buildup and prevent the surface from burning.

Post-processing: The marked area is "given a face mask.

Don't hurry to pack up after you've finished marking. Blow nitrogen or argon gas at the marked area for 5-10 seconds. Inert gas will keep out oxygen and prevent oxidation.For more demanding applications, the markings can be coated with a transparent antioxidant layer, such as a silicon-based protective agent, which acts like an invisible protective garment.

These details may destroy your efforts.

• When relative humidity exceeds 60 %, moisture accelerates oxidation reactions. It is best to operate in an air-conditioned room.

• Even materials of the same type from different batches may be different. It is recommended that you test a small sample of each batch.

• The temperature of the laser rises during extended periods of work, which can affect stability. Remember to stop the machine for 15 minutes every two hours to let it cool down.

If you follow these three steps, you will find that the black spots on the marked area are significantly reduced, and the edges of the mark are more clear.So next time you run into a problem with oxidation, don't panic. Try out these methods one after another. Maybe the problem will just go away!