The composition of the main furnace body of the single crystal furnaceThe main furnace body of the single crystal furnace is the most important component of the single crystal growth equipment, which directly determines the quality of the single crystal and the crystal growth efficiency. The main furnace body is usually composed of multiple parts such as the furnace shell, furnace lining, thermal separator and heater. 1.Furnace shell: It is mainly used to isolate the internal high temperature of the single crystal furnace from the external environment, and has the functions of heat preservation and heat insulation. The material of the furnace housing is usually stainless steel. 2.Furnace lining: The furnace lining is the part of the main furnace body that is in direct contact with the single crystal raw material, and its material should have good corrosion resistance, high temperature resistance, low chemical reactivity and low pollution. Refractory ceramic materials such as silicon carbide and quartz are commonly used for furnace lining. 3.Thermal separator: The thermal separator is used to isolate the high temperature area and the low temperature area in the furnace to avoid the temperature being too high or too low to affect the crystal growth. The commonly used material for thermal separators is alumina ceramic. 4.Heater: The heater is one of the most important parts of the main furnace body, and its main function is to heat the single crystal raw material and promote crystal growth. Heaters are usually made of graphite, but to a lesser extent stainless steel.
2. Characteristics of stainless steel materials Stainless steel is a metal material with excellent corrosion resistance, which is widely used in the manufacture of various chemical equipment, pressure vessels, electronic components and other industrial fields. In the main furnace body of the single crystal furnace, the use of stainless steel has the following advantages: 1Good corrosion resistance: The main components of stainless steel are alloying elements such as chromium and nickel, which can effectively resist chemical corrosion such as oxidative corrosion and acid etching. This property makes stainless steel materials perform well in the high temperature and high pressure environment of single crystal furnaces, effectively reducing pollution and degradation during the growth of single crystals. 2.Good high temperature resistance: stainless steel has a high melting point, and still has excellent mechanical properties and stability at high temperatures. This property makes stainless steel perform well in the main furnace body of the single crystal furnace, which can effectively ensure the long-term stable operation of the single crystal furnace. 3.Low chemical reactivity: Since the surface of stainless steel has a dense oxide film, it can effectively prevent the surface from reacting with other substances. In a single crystal furnace, the use of stainless steel materials can reduce the impurities and contamination generated by the equipment, and improve the purity and quality of the single crystal.
In this and subsequent articles, we will mainly make a technical explanation on the processing and surface cleaning of stainless steel materials, so that we can communicate and improve our own production processes.
The main structure of the single crystal furnace is mainly composed of:
Stove lid. 
The structure of the furnace cover is a circular head, and the flange hole or some connecting interface will be opened at the end of the head, for the surface of this shape, the best surface cleaning method is automatic sandblasting, and the technical difficulty is that the sand material should be continuous and stable, and the pulsation state is light. There are two kinds of automatic sandblasting, one is dry sandblasting, dry sandblasting is fast, and the sandblasting cleaning time of one head is about 20 cents. As if there is no calculation of feeding, the time of automatic platform car entering and exiting the silo.
The system cooperates with the automatic truss combined with the pneumatic ** blasting chamber.
Six high-pressure spray guns are used in the figure.
In actual work, it is better for general enterprises to use 2 sets of high-pressure single cylinders, which are cost-effective.
This automatic blasting can be carried out using liquid blasting equipment, i.e. the system removes the high-pressure blasting and dust filtration system, and uses an 11kw 6 spray gun. The effect is much better than that of dry type. For the furnace cover, turntable assistance and ordinary truss assistance are mainly used.
The picture shows a single crystal furnace body, and its shape is a column tube and branch end interface. When cleaning the surface of the blasting, you can press the whirlpool structure. That is, the return section can be found, and the furnace body can be rotated and moved horizontally by means of a platform car and a rotating roller.
As a result, the structure of the furnace body is also easy to achieve automatic sandblasting.
The cold water screen of the single crystal furnace is also mostly made of stainless steel.