The design principle of the high vacuum thermal evaporation carbon plating instrument is based on the physical evaporation deposition process in a vacuum environment. Its core is to evaporate carbon materials at high temperatures and deposit them on the surface of the sample to form a uniform conductive thin film. Here is a detailed explanation of its design principles:

1、 Establishment of Vacuum Environment

1. Eliminate interfering gases: Before coating, a specific high vacuum degree needs to be achieved inside the instrument, usually using mechanical pumps or molecular pumps to extract gas molecules from the chamber. This step is crucial because only in low-pressure environments can collisions between gas molecules and evaporated substances be effectively avoided, ensuring that carbon atoms or molecules can freely diffuse and accurately deposit on the surface of the workpiece.

2. Sealing guarantee: The vacuum chamber, as the core component, is made of high-strength, low gas permeability materials to maintain a stable vacuum state. Good sealing is the key to ensuring a vacuum environment, as it can prevent air and other impurity gases from entering the chamber and affecting the quality of the coating.

2、 Evaporation of Carbon Materials by High Vacuum Thermal Evaporation Carbon Plating Instrument

1. Selection of evaporation source: High purity graphite rods or carbon fibers are usually chosen as evaporation sources. These materials have a fixed chemical composition and good physical properties, and can stably evaporate carbon atoms during heating.

2. Heating method: The instrument heats the solid carbon source to a high temperature state (about 3000 ℃ or above) through resistance heating or electron beam heating, causing it to sublime into a gaseous state. During this process, carbon atoms or molecules gain enough energy to overcome surface binding forces and enter the vacuum chamber.

3、 Deposition of Carbon Atoms in High Vacuum Thermal Evaporation Carbon Plating Instrument

1. Free diffusion: Gaseous carbon atoms or molecules diffuse freely in a vacuum chamber, and they are rapidly transported to the surface of the substrate in a nearly collision free linear motion.

2. Condensation film formation: When gaseous carbon atoms or molecules encounter the surface of a workpiece at a lower temperature, they will re condense into a solid state and gradually form a layer of carbon film on the surface of the workpiece. During this process, two-dimensional collisions occur between deposited atoms, forming clusters that ultimately form continuous thin films through the contact and merging of adjacent stable nuclei.

4、 Guarantee of uniform sedimentation

1. Sample stage design: Samples are usually placed on a rotating sample stage to ensure uniform deposition at multiple angles. The position of the sample and the evaporation source needs to be kept appropriate. Being too close to the evaporation source may cause local overheating, while being too far away may reduce sedimentation efficiency.

2. Evaporation control algorithm: GVC-3000T adopts a unique evaporation control algorithm, which achieves precise deposition of carbon atoms by accurately controlling the heating power and evaporation time. This algorithm can ensure strict control of the thickness and uniformity of the carbon film under different process conditions.

5、 Auxiliary functions and protective measures of high vacuum thermal evaporation carbon plating instrument

1. Protection function: The instrument is equipped with multiple protection functions such as vacuum protection, overcurrent protection, and overvoltage protection to ensure the safety and stability of the equipment during operation.

2. Temperature monitoring and regulation: Through high-precision thermocouple sensors and infrared thermometers, the instrument can monitor the temperature of the evaporation source in real time, and automatically adjust the heating power based on the deviation between the set value and the actual value to ensure the stability of the evaporation process.