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Ceramic Bearing > Ceramic Bearing > Si3N4 Bearing > Si3N4 Ceramic Bearing 6830CEF
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Si3N4 Ceramic Bearing 6830CEF
商品编号:120000107
原价:$1648.00降价通知
规格型号:6830CEF
库存:12 件
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产品参数

商品编号: 120000107 品牌: TARSO
产品类别: Si3N4 Bearing 产品重量:(g) 570.00
轴承型号: 氮化硅轴承6830CEF 产品颜色: Black
等同其它型号: 使用特性:
外形尺寸-内径d:(mm) 150 外形尺寸-外径D:(mm) 190
外形尺寸-宽度B:(mm) 外形尺寸-内圈高度:(mm) 20
外形尺寸-外圈高度:(mm) 20 轴承材料-轴承外圈材料: SI3N4
振动等级: 轴承材料-轴承内圈材料: SI3N4
滚道类型: Non 轴承材料-滚动体材料: SI3N4
密封方式: OPEN 轴承材料-保持架材料:
轴承精度等级: P0 轴承材料-密封件材料:
内部游隙: C3 基本额定载荷-动载荷:(KN) 23
润滑剂类型: Non 基本额定载荷-静载荷:(KN) 20
极限转速-脂润滑:(r/min) 极限转速-油润滑:(r/min)

产品特性

With cold, wear, corrosion resistance, anti-magnetic insulation, self-lubricating, high-speed and other features

应用领域

Medical equipment, food processing machinery, cryogenic engineering, optics, high-speed machine tools, high-speed motor, printing machinery,etc

商品详情

 

Deep groove ball bearings ; deep groove ball bearings are bearing the most common type . Basic deep groove ball bearing is composed of an outer ring, an inner ring, a set of balls and a group holding structure into . Deep groove ball bearing type has two kinds of single and double row deep groove ball structure also split seal and open two structures, open means bearing structure without seal , sealed deep groove ball into dust seal and oil seal. Dust Gland Material steel stamping , just play simple to prevent dust from entering the bearing raceways . Oil- proof seal for the contact , which can effectively prevent the grease within the bearing spillover . Single row deep groove ball bearing type code 6 , double row deep groove ball bearing code is 4. Its structure is simple , easy to use , is the production of the most common , the most widely used class bearings. Deep groove ball bearings mainly take radial load , but also to support radial load and axial load. When the only radial load , the contact angle is zero. When the deep groove ball bearings with a larger radial clearance , with angular contact ball bearing performance, can bear large axial load , deep groove ball bearing friction coefficient is small , limit speed is also high.

Silicon nitride, the chemical formula of Si3N4, is an important structural ceramic materials. It is a hard substance itself has lubricity and wear resistance, the atomic crystal; high temperature oxidation. And it is also resistant to thermal shock, the air is heated to above 1000 ℃, rapidly cooled and then heated rapidly, it will not shatter. It is precisely because the silicon nitride ceramics have such excellent features, people often use it to manufacture bearings, gas turbines leaves, mechanical seal rings, permanent mold and other mechanical components, in addition to hydrofluoric acid, which does not react with other inorganic acids (reaction equation: Si3N4 +12 HF ═3SiF4 ↑+4 NH3 ↑), anti-corrosion ability.

Material Properties

High strength silicon nitride, silicon nitride, especially hot, is the world's one of the hardest substances. It is a very high temperature, the intensity has been able to maintain a high temperature to 1200 ℃without drop, heat will not melt into the melt until 1900 ℃to decompose, and have an amazing resistance to chemical corrosion, resistant to almost all inorganic acids and 30% or less of the caustic soda solution, but also the ability of many organic corrosion; but it is also a high-performance electrical insulation materials.

Properties of silicon nitride chemical formula Si3N4. White powdery crystals; melting point 1900 ℃, density of 3.44 g / cm (20 ℃); There are two variants: α-type hexagonal close-packed structure; βtype is similar to spar structure. Impurities or excessive silicon nitride when grayed out.

Silicon nitride with water almost no effect; slowly in concentrated acid hydrolysis of salts in solution and silica; soluble in hydrofluoric acid, and the acid does not work. Concentrated alkali solution can slow etching silicon nitride, can quickly molten alkali silicate and silicon nitride into ammonia. Silicon nitride above 600 ℃make the transition metal (see transition elements) oxide, lead oxide, zinc oxide and tin dioxide reduction and release nitric oxide and nitrogen dioxide. 1285 ℃when the silicon nitride and calcium nitride Ca3N2 two of the following reactions:

Ca3N2+Si3N4─→3CaSiN2

Nitride system of law are the following: in 1300 ~ 1400 ℃when the powdered silicon and nitrogen reaction; at 1500 ℃when pure silicon and ammonia;

A nitrogen gas containing a small amount of hydrogen in the burning mixture of silica and carbon; the ammonolysis product of SiCl4 Si (NH2) 4 complete thermal decomposition. Silicon nitride can be used as catalyst carrier, high temperature materials, coatings and abrasives.

Silicon nitride ceramics with high strength, high temperature characteristics, in the ceramic material whose mechanical properties of the best, heat shock resistance, oxidation resistance, wear resistance, corrosion resistance, heat engine components is the first ceramic a candidate material. In the machinery industry, silicon nitride ceramic balls for bearings, roller, ball seat, tool and die, new ceramic knives, pump plunger, mandrel sealing materials.

In the chemical industry, silicon nitride ceramics for wear and corrosion resistance components. Such as ball valves, pump, carburetor combustion, filters, etc..

In the metallurgical industry, as silicon nitride ceramic high-temperature, low friction, self-lubricating. For most metals, alloys was stable, and therefore, can be made of metal material processing tooling, such as the dial Kan mandrel, extrusion, wire drawing dies, roller, transfer roller, the heating element holder, thermocouple sleeve camp, metal heat treatment the support member , crucible of molten aluminum guide camp, aluminum lined bag and so on.

一、  Silicon nitride ceramic material resources in electronics, military and nuclear industry also has wide application:

Silicon nitride ceramic powder physico-chemical properties and product specifications

Silicon nitride ceramic is a white-gray powder formula: SI3N4;

Molecular Weight: 140.3, density 3.2g/cm2

Its chemical composition: N> 38-39; 0 <1-1.5; C <0.1; Fe <0.2.

Size according to user requirements.

Full ceramic bearing rings of silicon nitride and silicon nitride rolling elements (Si3N4) ceramic materials, maintaining PTFE, nylon 66, polyether imide, zirconia, silicon nitride, stainless steel or special aviation aluminum.

Silicon nitride ceramic bearings Features:

1, High speed: a cold, mechanical flexibility of small, anti-stress, poor thermal conductivity, light weight, low friction, etc., can be applied to 12,000 rev / min to 75,000 rev / min high-speed spindles and other precision equipment in;

2, temperature: material itself has a high temperature degrees 1200 , and good self-lubrication, temperature at 100 -800 temperature difference between the result does not produce a result of inflation. Can be used in furnaces, manufacturing plastic, steel and other high temperature equipment;

3, anti-corrosion: corrosion-resistant material itself has the characteristics, can be applied to acids, alkalis, inorganic and organic salts, water and other fields, such as: plating equipment, electronic equipment, chemical machinery, shipbuilding, medical equipment and so on.

4, shielded: do not smoke because of non-magnetic dust, can reduce the bearing off in advance, and big noise. Available in the demagnetization device. Precision instruments and other fields.

5, the electrical insulation: resistance force high arc injury-free bearings, available in a variety of electrical equipment insulation requirements.

6, the vacuum: Because ceramic materials with unique self-lubricating properties of the oil, in an ultrahigh vacuum environment, silicon nitride ceramic bearings can not be achieved to overcome the plain bearing lubrication problems.

Rare ceramics table:

Performance

Unit

Boron carbide

Alumina

Toughened Alumina

Zirconia

Silicon nitride

SiC

Density

g/cm3

2.4~2.51

3.7~3.99

5.5

6

3.2

3.2

Hardness

Kg/mm

2700~3200

2300~2700

1470~1500

1300~1500

1700~2700

2350~2450

Flexural strength

MPa

350~400

300~400

700

1000~1500

900

450~800

Compressive strength

MPa

1800~3500

2800~3500

2000

2000

3500

2250~3000

Fracture toughness

MPa*m-3/2

6

2~4

5~6

11

7

4~5

Weibull modulus

GPa

 

>7

>10

>15

>15

>6

Modulus of elasticity

GPa

 

407

260

210

320

410

Poisson's ratio

   

0.2

0.23

0.3

0.26

0.16

Thermal expansion coefficient

*10-6/

4.5

6.5~8.5

9.4

10.5

3.2

4.3

Thermal shock resistance

   

200

470

250

500

350

Electricity Resistance

 

0.3~0.8

101

       
 
 

 

Bearing common material properties table:

Performance

Unit

GCr15

9Cr18

Si3N4

ZrO2

Density

g/cm3

7.8

7.9

3.2

6

Thermal expansion

10-6/

11

17

3.2

10.5

Modulus of elasticity

GPa

208

200

320

210

Poisson's ratio

 

0.3

0.3

0.26

0.3

Hardness

 

800

700

1700

1300

Flexural strength

MPa

2400

2600

900

1000

Compressive strength

MPa

   

3500

2000

Toughness

Nm/cm2

20

25

7

11

Thermal conductivity

W/mk

30-40

15

3.5

2.5

Resistivity

mm2/m

1

0.75

1018

1015

Specific heat

 

450

450

800

400

Operating Temperature

 

120

150

1000

800

Corrosion Resistance

 

none

weak

strong

strong

Stress cycles

 

10*106

10*106

50*106

50*106

Rolling contact fatigue failure modes

 

not good

peel off

peel off

Peel off

Magnetic

 

have

have

good

good

Dimensional stability

 

not good

not good

good

good

Insulating

 

not good

not good

good

good

 

Silicon nitride ceramic bearings Installation: When installing the bearing, the end face of the ferrule should exert equal pressure on the circumference, as the ferrule into strictly prohibited directly with a hammer and other heavy percussion bearing face, so as not to damage the bearings! Additionally, If ferrule party (eg outer) pressure will ring through rolling the other (eg inner) push, which often cause indentations in the raceway or abrasions, and must not adopt . In particular the non-separable type of bearing is also installed in the shaft and the bearing housing shown in Figure 1: the inner and outer rings with the horn push balanced.

二、Ceramic Bearing Coordinate

㈠    The amount of interference

The inner and outer roller bearing fixed to the shaft or the bearing housing, when it receives a load, the ferrule and the shaft or the bearing housing does not occur with the surface radial, axial and rotational direction of the relative movement. This relative movement will occur with surface wear, friction cracks, corrosion or friction, as well as causing the bearing, shaft and bearing housing damage, then wear flour mixed with the bearing, be a cause of dysfunctional, abnormal heat or vibration causes.

Fixed bearing on the way to the ring and shaft or bearing housing mating surfaces aside the amount of interference, for static tie for the best. The thin ring with the load can be distributed equally on the circumference, without affecting load bearing capacity.

However, the use of static with, in addition to bearing installation and removal convenient, the free side bearings with separate bearings, axial movement can not, therefore, can not be used for all occasions.

㈡      Coordinate selection

With generally chosen according to the following principles:

According to direction of the load acting on the bearing, nature and one inner ring which is rotated, the load on the ring can be divided into rotational load, static load or a non-directional load. Rotate the load and do not bear the load of the ring should be taken as directed interference fit (interference fit), to withstand static load rings, desirable transition fit or moving with (clearance fit).

Bearing load is large, or to withstand vibration, shock load, to increase the interference. The hollow shaft, thin-walled bearing housing or light alloy, plastic bearing housing, they should increase the amount of interference.

According to direction of the load acting on the bearing, nature and one inner ring which is rotated, the load on the ring can be divided into rotational load, static load or a non-directional load. Rotate the load and do not bear the load of the ring should be taken as directed interference fit (interference fit), to withstand static load rings, desirable transition fit or moving with (clearance fit).

Bearing load is large, or to withstand vibration, shock load, to increase the interference. The hollow shaft, thin-walled bearing housing or light alloy, plastic bearing housing, they should increase the amount of interference.

High rotation precision is required to maintain the required high-precision bearings, shaft and the bearing box and improve the dimensional accuracy, to avoid excessive interference. If the interference is too large, may be the shaft or the bearing box geometry Accuracy of geometry of the bearing rings, to the detriment of the bearing rotation accuracy.

If not separable bearings (such as deep groove ball bearings) with static inner and outer rings are used, then the bearing installation and removal is extremely inconvenient, it is best to use inside and outside the ring moving with a party.

㈢      Recommended with:

About installing the bearing shaft and the shaft bearing housing, the aperture size tolerance, in the metric series, ISO286 (dimension tolerances and fits) have corresponding standards. Therefore, tolerances have been selected with the shaft, the aperture size tolerances may be. Figure 2 shows the pore size commonly used in the journal and the bearing inner and outer diameter tolerances with the relationship.

三、ceramic bearings and classification code

Ceramic bearings listed in this description represent on the suffix code to "Ce" as the symbol. The structure and composition is divided into: Full ceramic bearings and ceramic bearings combination. Wherein: ceramic bearing means, the outer ring and rolling elements are all with zirconium oxide (ZrO2), silicon nitride (Si3N4), silicon carbide (SiC), alumina (Al2O3) and other ceramic materials and manufactured according to user needs;