Active Member
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[China]
Address: Jianxin Village, Dingshu Town, Yixing City, Jiangsu Province
Contact name:Liu
Yixing Feifan Ceramics Co.,Ltd |
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Thermal shock resistant silicon nitride ceramic hook for aluminum industry
Advantages
The silicon atoms are located in the center of the tetrahedron. There are four nitrogen atoms around them, and then Each of the three tetrahedrons shares the form of one atom, forming a continuous and robust network structure in three dimensions. Many of the properties of silicon nitride are attributed to this structure. Pure Si3N4 is 3119, with both α and β crystal structures, all of which are hexagonal crystals. The decomposition temperature is 1800℃in air and 1850℃ in 011 MPa nitrogen. Si3N4 has a low thermal expansion coefficient and a high thermal conductivity, so its thermal shock resistance is excellent. The hot-pressed sintered silicon nitride is heated to l000℃ and then put into cold water without cracking. At less high temperatures, Si3N4 has higher strength and impact resistance, but it will break with the increase of use time above 1200℃, which will reduce the strength and fatigue damage at 1450℃, so Si3N4 The use temperature generally does not exceed 1300 ° C. Due to the low theoretical density of Si3N4, it is much lighter than steel and engineering superalloy steel. Therefore, it is suitable to replace the alloy steel with Si3N4 ceramic in places where high strength, low density and high temperature resistance are required. It is.
Typical Silicon Nitride Use
A Rotating Bearing Balls and Rollers
B Cutting Tools
C Engine Moving Parts---Valves,Turbocharger Rotors
D Enginer Wear Parts---Cam Followers,Tappet Shims
E Turbine Blades,Vanes,Buckets
F Metal Tube Forming Rolls and Dies
G Precision Shafts and Axles in High Wear Environments
H Weld Positioners
Product Description
Silicon Nitride Si3N4 Ceramic is one kind of technical ceramic materials which has very good performance in high temperatrue, its mechanical strength can be kept up to 1200℃. Its hardness and wear resistance performance ranks high among all technical ceramic materials. It has high electrical resistivity, high dielectric constant and low dielectric loss, is a choice for electrical insulation. Furthermore, it has good chemical stability and resistance to oxidation. As a result, silicon nitride ceramic has the best comprehensive performance and most wide application in high temperature field.
| Bulk density | Kg/m3 | 3.2×103 | ||
| Water absorption | % | 0 | ||
| Mechanical properties | Vickers hardness load 500g | (GPa) | 13.9 | |
| Flexural strength | MPa | 610 | ||
| Compressive strength | MPa | 3820 | ||
| Young's modulus of elasticity | GPa | 290 | ||
| Poisson's ratio | - | 0.28 | ||
| Fracture toughness | MPa√m | 5 | ||
| Thermal characteristics | Linear thermal expansion coefficient | 40-400℃ | ×10-16/℃ | 2.6 |
| 40-800℃ | 3.2 | |||
| Thermal conductivity | W/(m·K) | 20 | ||
| Specific heat | J/(kg·K) | 0.66×103 | ||
| Thermal shock resistance(Put into the water) | ℃ | 550 | ||
| Electrical characteristics | Dielectric strength | V/m | 10×106 | |
| Volume resistivity | 20℃ | Ω·cm | ＞1014 | |
| 300℃ | 1012 | |||
| 500℃ | 1010 | |||
| Dielectric constant (1MHz) | - | - | ||
| Dielectric loss angle (1MHz) | (×10-4) | - | ||
| Loss factor | (×10-4) | - | ||
| Chemical properties | Nitric acid (60%) 90℃ | WT Loss Mg/cm2/day | 1.00 | |
| sulfuric acid (95%) 95℃ | 0.40 | |||
| Sodium hydroxide (30%) 80℃ | 0.36 | |||
FAQ
Q: Is it possible to provide samples?
A: We can supply 1-2 samples, but we do not bear the shipping cost of the samples.
Q: How long is the delivery time usually?
A: Product delivery is subject to order quantity and processing requirements, and different product delivery times are inconsistent. Generally speaking, the delivery time of 1-2 common product samples is about 35 days.
Q: Which payment methods are supported?
A: T/T; credit card. Currently our company supports these two payment methods.
Q: What is the shipping date? How long can I ship?
A1: Shipped within 72 hours after the balance is settled
A2: After the production of the product is completed and passed the
internal inspection of the company, we will send the finished
product image to the customer for confirmation. After the balance
is settled, all the products will be sent to the customer's
designated delivery location.
