Vacuum sealing machine is a device used for sealing samples or high-temperature solid-phase synthesis reactions in anaerobic and anhydrous environments, widely used in materials science, chemical synthesis, geological analysis and other fields.

1、 Core functions of vacuum sealing machine:

1. Oxygen free and waterless vacuum seal

Principle: The air and moisture inside the tube are removed by vacuuming, and then the test tube is sealed to ensure that the sample is completely isolated from oxygen and water vapor.

Applicable scenarios:

Preservation of samples sensitive to air (such as metallic sodium and organic photosensitive materials);

Anaerobic bacterial cultivation and encapsulation of easily oxidizable drugs;

High precision material preparation (such as quantum dots, nano powders).

2. High temperature solid-phase synthesis

Principle: Heat a quartz or metal tube under vacuum or inert atmosphere, causing the internal reactants to undergo solid-state reaction at high temperature, and finally melt and cool.

Applicable scenarios:

Inorganic material synthesis (such as ceramics, single crystal growth);

Metal oxide reduction reaction;

Preparation of semiconductor thin films.

2、 Technical characteristics of vacuum sealing machine:

1. Vacuum system

to configure:

Mechanical pump+molecular pump group (high ultimate vacuum degree);

The vacuum gauge monitors pressure in real-time.

Advantage:

Thoroughly eliminate oxygen and moisture to avoid sample oxidation or hydrolysis;

Support inert gas backfilling to achieve a controlled atmosphere environment.

2. Sealing technology

Method:

Flame sealing: The hydrogen oxygen flame or acetylene flame locally heats the glass tube to form a smooth sealing end;

Laser sealing: precise control of welding position, suitable for quartz or metal tubes;

Resistance heating: Metal tubes are melted and sealed using graphite or carbon rod electrodes.

Advantage:

Reliable sealing performance;

Can handle various materials such as glass, quartz, stainless steel, etc.

3. Temperature control

Heating system:

Tube furnace heating with programmable temperature control (adjustable heating rate);

The length of the temperature equalization zone is optional to ensure the uniformity of the reaction.

Advantage:

Meet the requirements of high-temperature solid-state reactions (such as sintering and pyrolysis);

The cooling process can be controlled (natural cooling or rapid cooling) to avoid side reactions.

4. Operational safety

Protective design:

Explosion proof box structure (to prevent glass breakage and splashing under high temperature or vacuum conditions);

Emergency relief valve (to prevent pipeline rupture caused by abnormal vacuum degree).

Automated control:

Touch screen setting parameters (vacuum degree, temperature, time);

Fault alarm (such as vacuum leakage, power outage due to overheating).