Silicon nitride ceramics heating
Product Description
Product Detail
Silicon nitride ceramics heating Product introduction
Silicon nitride ceramics heating is an alloy electric heating wire encapsulated in a dense silicon nitride ceramic, which acts as a heat transfer medium and an insulating medium. The shape is usually a rectangle with a thickness of 4mm. The thermal conductivity of silicon nitride ceramics is equivalent to that of stainless steel, excellent insulation properties, and excellent comprehensive mechanical properties. Silicon nitride ceramics heating is very different from that of scale, and scale will crack and fall off after consolidation. Under the premise of meeting the electrical safety, it can withstand the maximum heat load of 70W/cm ', and its volume is only 115 of the traditional electric heater, which can provide a broader design space for the instant hot water system and the instant hot water drinking device, making it possible for ultra-thin and ultra-small hot water equipment.
Silicon nitride ceramics heating Product characteristics
Silicon nitride ceramics heating is based on high-performance silicon nitride ceramics, coupled with a proprietary formula and hot pressing manufacturing technology, so it has many excellent features that traditional heating elements do not have.
Small, light and power saving
■ Small size
■ High thermal efficiency
■ High surface load, heating liquid surface load up to 78w/cm
High reliability
■ Good electrical safety, the leakage current after breaking is less than 20mA
■ Long service life, correct service life >10000 hours
■ Resistant to acid and alkali corrosion
■ Excellent insulation and thermal conductivity
Excellent thermal properties
■ Small thermal inertia, fast heating speed
■ Strong thermal shock resistance
Silicon nitride ceramics heating structure diagram
The following figure shows the typical structure and structure of TC series ceramic electric heating elements
|
Density |
|
|
Bulk Density |
3.2~3.3g/cm3 |
|
Relative Density(%) |
99~100% |
|
Mechanical Propertise |
|
|
Fracture Toughness |
5.0-8.0MPa*m1/2 |
|
Bending Strebgth(RT) |
≥800MPa |
|
Bending Strength(HT) |
≥600MPa |
|
Vickers Hardness |
15-20GPa |
|
Dielectric Properties |
|
|
Relative Dielectric Constant |
6~7 |
|
Volume Resistivity |
10 Ωcm |
|
Thermal Properties |
|
|
Thermal Conductivity |
40-50 W/(m*K) |
|
Thermal Expansion Coefficient |
3.0x10/K |
|
Corrosionresistance |
|
|
Acid Corrosion Resistance |
Boiling 5% sulfuric acid solution for 6h,Corrosion rate<10 gm2hCorrosion rate <10g'mzhafter 6hin 5%sulfuric acid boiling solution |
|
Alkali Corrosion Resistance |
30% Boil the sodium ammoxide solution for 6h，Corrosion rate<0.6gm*hCorrosion rate<0.6 gm2h after 6 hin 30%sodium hydroxide Boiling solution |
[1] Test the three-point bending strength at 800°C;
[2] The Vickers hardness Hv value is the value measured at 10 kg test pressure;
Silicon nitride ceramics heating property
|
Electrical Speciications |
|
|
Voltage |
AC110-380V-,5060 HzDC12V.24V.60V |
|
Power |
50-4000 W |
|
Electric insulation Strength |
60 second no breakdowmhappens (Room lemperature) |
|
Leakage Current |
≤0.25 mA in working conditionbreak in water |
|
Life Time |
>10000 h |
|
Poweronloffcycle |
100.000Times |
|
Max,HeatLoadl |
70 W/cm 2 |
|
Applicable medium |
Waler,acid'aikall solution, oil, organic, liquid, gas, etc. |
[1] The leakage current is very small under normal working conditions, but it is still recommended to set reliable grounding;
[2]10 mA is the human body safety current limit stipulated in the national standard GB4706.1-2005(IEC60335):
[3] The maximum surface load that the heating sheet can withstand depends on the nature of the heating medium, the heat dissipation method and the working temperature. Generally, it can withstand a maximum of 70 W/icm2 when heating stationary water
Silicon nitride ceramics heating Model and parameter
|
Model |
Dimension(mm) |
Power(W) |
||||
|
LH |
WH |
DH |
LA |
W |
||
|
TC-A |
90 |
17 |
4 |
25±2 |
200 |
600~2500 |
|
TC-B |
75 |
30 |
4 |
25±2 |
200 |
400~3500 |
|
TC-C |
57 |
17 |
4 |
25±2 |
200 |
800~1500 |
|
TC-D |
95 |
24 |
4 |
25±2 |
200 |
400~3800 |
|
TC-E |
100 |
17 |
4 |
25±2 |
200 |
400~2700 |
Heating element size and power can be customized according to customer requirements.
Silicon nitride ceramics heating Application field
◇ New energy vehicle
◇ Heating water, oil and other liquid constant temperature bathtub, constant temperature fish tank, constant temperature heater corrosive environment (acid, alkali environment) heater is hot faucet, small kitchen treasure
◇ Instant water heater
◇ Smart toilet seat heating
◇ Laboratory special heating liquid components, heating system customization