Absorbing materials are mainly used in two aspects: civilian and military. Three types of nanomaterials are specifically applied

The so-called absorbing material refers to a type of material that can absorb or significantly reduce the electromagnetic wave energy received on its surface, thereby reducing the interference of electromagnetic waves.

In engineering applications, in addition to requirementsAbsorberIn addition to high absorption of electromagnetic waves in a wide frequency band, it is also required to have lightweight, temperature resistance, moisture resistance, corrosion resistance and other properties.

The three commonly used nanomaterials for absorbing materials are as follows:

1. Carbon based nanomaterialsNano graphene, carbon nanotubes, etc

Carbon nanotubes exhibit excellent absorbing properties, as well as characteristics such as light weight, good compatibility, and wide absorption frequency band, making them the most promising absorbing material for the new generation.

2. Iron series nanomaterialsNano iron powder, nano iron oxide, etc.
The use of nano metals and alloys as absorbers mainly adopts a multiphase composite approach, with Fe, Co, Ni and other nano metals and nano alloy powders as the main components. Their absorption performance is better than that of single-phase nano metal powders.
3. Ceramic series nanomaterialsSuch as silicon carbide whiskers, nano silicon carbide, nano silicon nitride, and so on.
Silicon carbide has been extensively studied as an absorbent. Silicon carbide not only has certain absorption properties and can weaken engine infrared signals, but also has advantages such as high temperature resistance, low relative density, good toughness, high strength, and high resistivity. It is one of the rapidly developing absorbents abroad. The absorption frequency band of nano silicon carbide is wider, and it has good absorption effects on both millimeter and centimeter wavelength bands.

In the increasingly important stealth and electromagnetic compatibility (EMC) technologies, the role and position of electromagnetic wave absorbing materials are very prominent. So far, nano absorbing materials mainly have two aspects: civilian and military.

In civilian applications, nano absorbing materials are mainly used for human body protection. Due to the application of high-power radar, communication equipment, microwave heating and other devices, preventing electromagnetic radiation or leakage and protecting the health of operators is a new and complex issue, and absorbing materials can achieve this goal. In addition, electromagnetic radiation is commonly present in household appliances today, and can be effectively suppressed through the rational use of absorbing materials and their components..

In military applications, it is mainly used in radar imaging technology. Coating composite absorbing materials on various weapons, equipment, and military facilities such as airplanes, missiles, tanks, ships, and warehouses can absorb reconnaissance radio waves, attenuate reflected signals, and break through enemy radar defense zones. This is a powerful means of anti radar reconnaissance and a way to reduce weapon systems from being attacked by infrared guided missiles and laser weapons.

Nano absorbing materials have the characteristics of light weight, wide frequency band, and good performance, and have a wide range of applications. Under the same material conditions, nanomaterials are significantly superior and can meet the requirements of the times for absorbing materials. It can be foreseen that nano absorbing materials will play a huge role in insulation, energy conservation, environmental protection, human body protection, and military stealth technology in the future.

category	unit	YB-2W		YB-3W		YB-4W		Testing standards
brand		TG-2W-A	TG-2W-B	TG-3W-A	TG-3W-B	TG-4W-A	TG-4W-B
thermal conductivity	W/m·k	2±0.5		3±0.5		4±0.5		ASTM D5470
magnetic permeability	μ'（@10MHz）	≥10	≥5.0	≥8.0	≥3.0	≥6	≥3.0	GB/T32596-2016
D10	μm	0.3～1.5	0.3～0.6	0.5～1.0	0.6～1.0	0.2～1.0	0.5~0.8	GB/T 19077.1-2008
D50	μm	1.5～8.0	1.0～2.0	2.0～5.0	2.5～3.5	1.5～4.0	2.3~3.0
D90	μm	4.0～25.0	3.0～5.0	6.0～16.0	6.5～9.0	7.0～13.0	5.0~8.0
A.D	g/cm3	1.5～4.0	1.2～1.8	1.8～3.0	1.5～2.0	2.0~2.8	1.6~2.4	GB/T 1479.2-2011
T.D	g/cm3	2.5～5.5	2.5～3.5	2.5～4.0	2.5～3.5	3.0~3.5	2.5～3.5	GB/T 5162-2006
hardness	Shore A	50~80	50~80	50~80	50~80	50~80	50~80	ASTM D2240
Resist breakdown voltage	KV	≥0.15	≥1.50	≥0.35	≥2.00	≥0.5	≥2.50	ASTM D149
Usage frequency	GHz	3~8	8~12	5~10	10~20	8~18	18~40	-