SSIC silicon carbide sealing ring

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Special ceramics: Special ceramics

Product Description:

SSIC  silicon carbide sealing ring

SSIC  silicon carbide sealing ring

SSIC  silicon carbide sealing ring

SSIC  silicon carbide sealing ring

SSIC  silicon carbide sealing ring

SSIC  silicon carbide sealing ring


Silicon carbide seal rings Definition - silicon carbide material, depending on the process, after a certain production methods, the production of a silicon carbide products. Its purpose - use is quite extensive, a variety of mechanical products can be applied to, depending on the specifications, the production of different types of products, and ultimately to play a role in sealing. How to develop silicon carbide seal ring market - depending on the product positioning market, according to market distribution brand. Prospects silicon carbide seal ring - prospects for development is still quite widely, in general, based on the current process, innovation, products more promising.

Feature

1. plasticity - as long as the silicon carbide material has a certain process, it may be compressed into various shapes of blank, then a second and can be processed, shaped into products that customers need.

2. corrosion resistance - silicon carbide seal ring may be in the acid environment, the sealing effect is not reduced.

3. abrasion resistance - silicon carbide seal ring through a certain finishing process, so to achieve high-precision flat and smooth, plus the wear resistance of silicon carbide, silicon carbide seal ring so you can use mutual friction. In high-temperature performance, wear performance is not reduced.

4. High temperature resistance - due to the material properties of silicon carbide, silicon carbide seal ring and therefore has a high temperature resistance, depending on the process, high temperature performance is not the same. The reaction sintered silicon carbide seal ring can be used at 1300 degrees without pressure sintered silicon carbide seal ring can reach 1600 degrees.

Here are some of the pressure sintered silicon carbide products, physical and chemical parameters:

 

medium

content

Causticity

Atmospheric SIC

The reaction SIC

WC

WC

AL2O3

ZrO2

Si3N4

stainless steel

steel

HNO3 nitric acid

50%

A

A

C

A

A

C

C

C

Hydrochloric acid HCI

35%

A

A

C

A

A

C

C

A

Sulfuric acid H2SO4

98%

A

A

C

A

A

C

C

A

Hydrofluoric acid HFF

40%

A

C

C

C

C

C

C

C

Phosphoric acid H5PO4 215OC

85%

C

C

C

C

C

C

C

C

HNO3+HF

20%+5%

A

C

C

C

C

C

C

C

Sodium chlorate NaCIO

10%

A

B

C

A

A

A

C

A

Sodium hydroxide NaOHH

50%

A

C

A

B

A

B

A

A

Potassium hydroxide KOH


A

C

A

B

A

B

A

A

Acetic acid CH3COOHH

80%

A

A

C

A

A

C

C

C

Sodium sulfate + Na2CO3 + H2SO4 925OC

 


A

A

C

A

A

C

C

B

Silica solution SIO2

 


B

C

C

C

C

C



Assessment Method: the specimen prior polishing, immersed in the test liquid (70OC) for 100 hours, the weight was measured and observed microstructure, weight reduction is calculated by the degree of corrosion was observed microstructure for corrosion to comprehensive judgments.

A level (corrosion): corrosion rate ≤0.125mm / ingredients in a small amount of corrosion observed slice

Level B (somewhat resistant): corrosion rate = 0.125-1.0mm / or annual corrosion rate ≤0.125mm / observe a large number of corrosion

Class C (resistant to corrosion): corrosion rate ≥1.0mm / or the main ingredient of Corrosion

 Silicon carbide performance indicators

Index Name

 

Atmospheric SiC

Reaction Bonded Silicon Carbide

Purity (%) of silicon carbide

> 97

>90

Density (g / cm)

3.06-3.15

>3.05

Particle size (um)

0.5-0.7

8-20

Hardness (HRA)

≥90

≥90

Flexural Strength (MPa)

400-580

350-450

Compressive strength (MPa)

3900

>2500

Fracture Strength (MPa)

3.05-4.6

4.3

Elastic Modulus (GPa)

380-410

420

Thermal conductivity

102.6

35-110

Coefficient of thermal expansion (1 / ℃)

4.02×10

4.3×10

Poisson's ratio

0.14

0.15

 


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Q:Classification of sealing strip by use
Table 29.2-1 classification of sealsThe basic requirements of the seal is the sealing is good, safe and reliable, long service life, should be compact in structure, simple system, convenient maintenance, low cost, most of the seal parts, should ensure interchangeability, realize standardization and seriation.Various types of by sealing group leader have their characteristics and scope of use, the design of sealing should first be analyzed and compared.Table 29.2-2 lists the characteristics of a variety of commonly used sealing methods. Table 29.2-3 is the type and range of applications of dynamic seals.Sealing type, reciprocating motion, rotation, pressure resistance, high speed resistance, heat resistance, cold resistance, durability, remarksPacking seal pump, turbine, valve, autoclave. Available for filament packing, textile packing, or molding.O - ring seal piston seals are widely used as static seals, with good durability at this time.
Q:How about the sealing ring for the piston rod seal?
The composite sealing ring, such as K type stepseal, it consists of two distinct components: one is to join the ladder bronze seal filler with PTFE (main seal), the other is a O shaped sealing ring (elastic element and side seal). The combination sealing ring (K type) has the characteristics of low friction resistance, no creeping at the start, low leakage and wear resistance. The combination of the sealing ring avoids the contact between the metal, improves the supporting ability, bears the certain lateral force, the small friction force, and is suitable for the high voltage and high speed system, and has been proved by the experiment.
Q:All the seals in the car engines, especially those sealed in the cylinders.
Valve cover, cushion, front and rear end cover, cushion.The oil pan mat, oil filler cap seal, vacuum pipe sealing tube.
Q:What is the international requirement for the temperature of the seal in the hydraulic cylinder?
X ring, rubber ring, rubber ball, Pu seal, seal, pipe joints seals, rubber gaskets and rubber parts. All imported raw materials.
Q:What are the storage conditions for seals?
First of all, the pressure is an important factor affecting the quality of seals, the pressure level, the length of the pressure cycle cycle, the seal damage (such as extrusion) have a great impact. The higher the pressure, the greater the influence of other factors on the performance of the seal, such as temperature, speed, the material of the seal, the clearance between the piston and the cylinder, the clearance between the piston and the cylinder head.Another is the temperature and friction, it is difficult to describe the maximum use temperature and minimum use temperature of a sealing material, because it is the result of a series of factors. The piston and piston rod have different operating temperatures, so we should choose them differently. Another is the seal product surface roughness, surface characteristics, pressure, medium, temperature, sealing materials, seals type and speed of movement, these are the factors affecting the seal.The last is surface treatment. Experience has shown that the characteristics of the surface of the cylinder piston and the piston rod have a great influence on the life of the seal. Surface characteristics are defined by the values of surface roughness RA. RA is the arithmetic mean of the shape of the surface deviating from the absolute value of the center line. However, these values do not fully indicate the effect of surface conditions on the seals, because even under the same roughness, different surface shape features can cause wear of seals to varying degrees of seal.
Q:Sealing type and specification of solenoid valve core
Noise reduction and decompression of the seat, and therefore used for flashing and other industrial and mining, the drawback is that the media can not be used for dirty areas.V- ball and eccentric rotary valve can be used in slurry and other impurities containing medium.
Q:What are the material requirements of the valve sealing surface?
Sealing materials should meet the requirements of sealing function. Due to the different sealing medium and different working conditions of the equipment, sealing materials are required to have different applicability. The sealing material requirements are: the material density, not easy leakage; the appropriate mechanical strength and hardness; and good elasticity, compression, permanent deformation is small; the high temperature softening, decomposition, low temperature, non hardening embrittlement; the good corrosion resistance in the long-term work of acid and alkali, oil medium, the volume of a small change in hardness, and adhesion to the metal surface; the low friction coefficient, good wear resistance; with the sealing surface with soft and full; the good anti-aging, durable; to facilitate manufacturing, price cheap, easy. Obviously, it is impossible for any material to meet the above requirements completely, but the material with excellent sealing performance can meet most of the above requirements.Rubber is the most commonly used sealing material, in addition to rubber, suitable for sealing materials as well as graphite band, PTFE and various sealants, etc. table 29.2-4 lists the classification and use of sealing materials.
Q:What are the seals that are resistant to 500 degrees of high temperature?Airtight chamber gas temperature up to 500 degrees, what are the appropriate seals available? Thank you
First of all, are you moving or sealed? Metals, semi metals, or high temperature nonmetallic materials can be used.
Q:What seals should be used for high speed spindle rotation?
Rotary shaft lip type suggested use is made of fluorine rubber seal (seal fluorine rubber material), resistant to environmental conditions are as follows: -20 degrees -240 degrees, excellent chemical resistance, excellent wear resistance.
Q:Requirements for storage of rubber seals
Rubber seals are vulnerable parts, and the proper storage of them has a great influence on their service life. Rubber seals for storage requirements and precautions: 1, rubber seals must be packed in black plastic bags or sealed containers, to avoid direct sunlight;

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