Silicon nitride ceramic electric heating element

INNOVACERA’s silicon nitride heating elements are normally rectangular in shape. These heaters have a lot of operation zone up to 1000 degree C and a cold zone in the contact area. The encapsulated terminal can prevent short circuit caused by conductive contamination. They can be operated with or without a controller. Silicon nitride heater has several times the durability that silicon carbide products.

The performances of Si3N4 ceramic heater:
1) Electrical safety. The current leakage after the break is less than 10 mA
2) High-temperature resistance. Dry point up to 1300 ℃
3) High surface load. Heating liquid surface load up to 78w/cm2
4) Small size
5) The thermal inertia is small, faster heating up.
6) Long service life
7) Acid and alkali corrosion resistance

Their have specification as below:
1) Rated Voltage: 230V，220V，110V，120V
2) Hz: 50/60HZ
3) Rate power
500-3500W
4) Max Power: 3500W
5) Service life: 5000 hours
6) Electric insulation strength: 2500V、50HZ (Room temperature)，no breakdown in 1 minute
7) Leakage of current: No more than 0.025 mA under normal working conditions, no more than 10 mA in water after breaking
8) Acid corrosion resistance: Boiling in 5% sulfuric acid solution for 6h, the corrosion rate is less than 10g/m2•h
9) Alkali resistance: Boiling in 30% sodium hydroxide solution for 6h, corrosion resistance less than 0.6g/m2•h
10) Medium: liquid, water
11) Dimension, power and input voltage are customize according to your requirement. Stock dimensions as below:

Mechanical properties:

Hardness（HRA）	Fracture Toughness（Mpa.m1/2）	Flexural Strength（Mpa）
92.0~94.0	6.0~8.0	≥900

BN-TiB2 Boron Nitride Ceramic Crucible for High Power of Electron Beam

BN-TiB2 crucible is often used for electronic beam evaporation. The material is with electric conduction.

 

Technical Data:

Material: BN+TiB2

Binder: B2O3

Color: Grey

Electrical resistivity(room temperature): 300-2000uΩ.cm

Working temperature: ＜1800℃

Thermal Conductivity: ＞40 W/mK

Coefficient of thermal expansion:4-6×10^-6K

Bending Strength: ＞130Mpa

Evaporation Rate: 0.35-0.5 g/min.cm2

BN-TiB2 Boron Nitride Ceramic Crucible for High Power of Electron Beam

Types of oxygen sensors

According to the substance used in their sensitive element, are:

 

Zirconium (zirconium oxide)

Titanium (titanium oxide)

Wideband

 

According to their design:

 

Single-wire lambda sensor

Two-wire lambda sensor

Three-wire lambda sensor

Four-wire lambda sensor

 

Single-wire lambda sensor was used in the early injection systems with feedback (lambda regulation). It has only one terminal, which is the signal terminal. Sensor ground is its housing and it connects to the engine ground through the exhaust pipes.

Two-wire lambda sensor has a separate grounding cable. It was used in the early injection systems with feedback (lambda regulation) also.

The disadvantage of the single-wire and the two-wire sensors is that their operating temperature range starts at 300 ºC. The sensor will not work and will not produce a signal until this temperature is reached. It was necessary for the sensor to be mounted as close to the engine cylinders as possible in order to heat and wrap from the hottest exhaust gas stream. The process of heating the sensor slows down the regulation process of the onboard controller because of the feedback. In addition, using the exhaust pipe as a signal ground requires the sensor’s thread to be coated with a special electrically conductive paste, which increases the possibility of a bad contact in the feedback circuit.

Types of oxygen sensors

In the three-wire lambda sensors, is a special heating element inside which is constantly turned on when the engine is working and thus it’s reducing the heating time of the sensor to the working temperature. This allows the installation of the sensor on the exhaust manifold, near the catalytic converter. The disadvantage is the need for electrically conductive grease.

In the four-wire oxygen sensors – two of the terminals are the heater terminals and the other two, are the signal termina

If you want to know more, pls contact us.

What Is Ceramic Heat Sink?

Components of modern technology products, such as computer chips or light-emitting diodes, generate more and more waste heat during operation, and generally existing heat dissipation devices used to assist heat dissipation components usually include at least a metal heat sink and a fan conducts the waste heat from the operation of the heating element through the heat sink to remove it by air convection, and uses the fan to forcibly accelerate the convection of the air around the heating element to achieve the effect of rapid heat removal.
However, the heat transfer coefficient of existing metal heat sinks is not very good. Therefore, heat sinks made of ceramic materials with better heat transfer characteristics appear on the market in order to achieve better heat dissipation effects.

Ceramic heat sink classification
There are aluminum oxide heat sinks, aluminum nitride heat sinks, and silicon carbide heat sinks.

There is the performance comparison between the usual heatsink VS ceramic from NISHIMURA Advanced Ceramics

Left： Usual Black Alumite fin （50×12H mm）
Right：N-9H Ceramic heat sink (50×6T mm）

The temperature of the Heater itself (Without heat sink)	The temperature of the heater with heat sinks
	Black Alumite fin	Ｎ-9Ｈ Ceramic	Difference ΔＴ
150℃	90.3℃	86.7℃	3.6℃
180℃	119.1℃	110.8℃	8.3℃
250℃	175.4℃	164.3℃	11.1℃

 

Advantages of Ceramic Heat sink
1. Do not store heat, and dissipates heat directly, which is fast and reduces the influence of the insulating layer on thermal efficiency;

2. The polycrystalline structure of the ceramic heat sink enhances heat dissipation. Year-on-year conditions, surpassing most thermal insulation materials on the market;

3. The multi-directional heat dissipation of the ceramic heat sink accelerates heat dissipation;

4. High thermal conductivity, high voltage resistance, high-temperature resistance, wear resistance, high strength, oxidation resistance, acid, and alkali resistance, long service life, and low thermal expansion coefficient, ensuring that it can be used in high and low-temperature environments or other harsh environments.

5. Effective in anti-interference (EMI) and anti-static;

6. It is made of natural organic materials, which meets the requirements of environmental protection;

7. Small in size, light in weight, high in strength, saves space, saves materials, saves freight, and is more conducive to the rational layout of product design;

8. Withstand high current, and high voltage, prevent leakage and breakdown, has no noise, and will not generate coupling parasitic capacitance with power tubes such as MOS, and thus simplifies the filtering process; the required creepage distance is higher than that of metal bodies The short requirement further saves board space, which is more conducive to the design of engineers and the passing of electrical certification.

Applications:
1. Ceramic heat sinks are mainly used in high-power equipment, IC MOS tubes, IGBT chip-type heat-conducting insulation, high-frequency power supplies, communications, mechanical equipment, high-current, high-voltage, high-temperature and other product components that require heat conduction and heat dissipation insulation.

2. LED lighting, high-frequency welding machine, a power amplifier/audio, power transistor, power module, chip IC, inverter, network/broadband, UPS power supply, high-power equipment, etc.