Processing custom silicon nitride ceramic parts
Product Overview
Silicon carbide has two main crystal structures, namely cubic β-SiC
and hexagonal-SiC. The basic structural unit of silicon carbide
crystal is SiC and CSi tetrahedrons interspersed with each other.
The tetrahedrons share the same edges to form a plane layer, and
are connected with the next stacked tetrahedrons to form a
three-dimensional structure. Because the tetrahedral stacking order
can form different structures, hundreds of variants have been
found. Generally, the letters C (cubic), H (hexagonal), and R
(rhombic) are used to indicate the lattice type, and the number of
layers contained in the unit cell is used to indicate the
difference. For example, nH indicates that there are n layers of
repeating periods along the c axis. The hexagonal structure of, and
mR represents a rhombohedral structure with m layers of repeating
periods along the c axis.
Product parameter table
| Colour | dark grey |
| Density (g/cm3) | ＞3.2 |
| Relative density | 99% |
| Hardness (HV) | 14-16 |
| Fracture toughness (MPa•m1/2) | 6-7 |
| Normal temperature flexural strength (MPa) | 600-800 |
| Coefficient of expansion (μm/K) | 20-400℃ | 3.2 |
| 400-1000℃ | 4.3 |
| Dielectric strength (KV/mm) | ＞13 |
Resistivity
(Ω·cm) | 20℃ | ＞1014 |
| 500℃ | ＞1011 |
| Thermal conductivity (W•(m•K)-1) | 15-22 |
| Acid and alkali corrosion resistance | excellent |
| Thermal shock resistance ΔT℃ | 1300 |
| Maximum operating temperature | 1600 |
| Apparent porosity% | 0 |
Product features
The high hardness of the silicon carbide ceramic tube is because
the hardness of the silicon carbide is quite high, the Mohs notch
hardness is 9.2, and the Kjeldahl microhardness is 2200~2800kg/mm2
(load 100g).
And although the hot hardness of silicon carbide decreases with
increasing temperature, the compressive strength of silicon carbide
is 224MPa, and the flexural strength of silicon carbide is 15.5MPa.
Silicon carbide is synthesized at high temperature, so silicon
carbide ceramic tubes are mostly prepared at high temperature or
used at high temperature.
Applications
This product has been widely used in polysilicon reduction
furnaces, military manufacturing, aviation, and power.
Product Picture
The average thermal expansion coefficient of silicon carbide can be
4.4×10-6/℃ in the range of 25~1400℃. The measurement results of the
thermal expansion coefficient of silicon carbide show that its
value is much smaller than other abrasives and high-temperature
materials. For example, the thermal expansion coefficient of
corundum can be as high as (7~8)×10-6/℃. The thermal conductivity
of SiC is very high, which is another important feature of the
physical properties of silicon carbide ceramic tubes.
Its thermal conductivity is much larger than other refractory
materials and abrasives, about 4 times the thermal conductivity of
corundum. Therefore, silicon carbide has a low coefficient of
thermal expansion and high thermal conductivity, so the silicon
carbide ceramic tube receives less thermal stress during the
heating and cooling process, which is why the silicon carbide
ceramic tube has particularly good thermal shock resistance.
Product packaging
Carton packaging or according to customer requirements
FAQ
1. Are you a businessman or a manufacturer?
We are a company, we have our own factory
2. How long is your delivery time?
Negotiable
3. Can the product be customized?
Can be customized
4. What is the product packaging?
Carton or according to customer requirements
