The main characteristics of boron carbide:
1. 高い融点
2. Large neutron capture
3. 低密度
4. Better chemical inertness
5. 優れた熱特性
6. 優れた電気特性

As a new type of ceramic, boron carbide ceramics have high wear resistance and high hardness structure and have been used in military and aviation fields.

The main distribution countries of boron carbide resources in the world are Turkey, the United States, Russia, Chile and China.

According to statistics from the US Geological Service, the global boron resource reserves in 2017 reached 1.1 billion tons, of which Turkey had 950 million tons.

Boron carbide properties:
1. Crystal structure: hexagonal rhombohedral structure
2.物性：
High hardness P-type semiconductor
強力な衝撃吸収
高い融点
高弾性
low expansion
good oxygen absorption capacity
3. Chemical properties: Boron carbide will not react with acids, alkalis and most inorganic compounds at room temperature, hardly react with oxygen at room temperature, and its chemical properties are stable.

Production of boron carbide powder
1. Carbothermal reduction method: use electric arc furnace for high-temperature reduction reaction, the chemical formula is:

2B₂O₃+7C=B₄C+6CO

4H₃BO₃+7C=B₄C+6CO+6H₂O

2.Self-propagating High-temperature Synthesis
Using SHS technology, a technology for synthesizing materials by utilizing the self-heating and self-conducting effects of high chemical reactions between reactants.

3.Chemical vapor deposition (CVD)

At a higher temperature, the mixed gas interacts with the surface of the substrate to decompose some components of the gas and form a thin film on the substrate.

Firing of boron carbide
1. Hot pressing sintering
At present, the most used method is to pack the powder in the mold, and apply a certain pressure to the powder while heating. However, this method has strict control over production, high cost and low production efficiency. .

2. Pressureless sintering
Parts with complex shapes can be fired, the production cost is low, and the operation is simple, but the performance of the finished product is poor, and the product is easy to crack during the firing process.

3. Spark plasma sintering

4. Microwave sintering

応用分野：
Bulletproof armor field: Boron carbide ceramics have the characteristics of light weight and ultra-high hardness, and are the best material for bulletproof inserts and bulletproof shields.