MachineU > China Products > Chemicals > Inorganic Chemicals > Non-Metallic Products > Ceramics

Alkali Resistant 99% Alumina Ceramic Components

Specifications

Brand Name :

Antaeus

Model Number :

AD-A019

Certification :

Place of Origin :

Hunan,China

MOQ :

Negotiation

Price :

Negotiation

Payment Terms :

T/T or Negotiation

Supply Ability :

Full Supply

Delivery Time :

15-45 days

Packaging Details :

Inner vacuum packaging, outside carton.

Chemical ingredients :

Al2O3

Max. Use Temp. :

1650℃

Bulk Density :

3.6g/cm3-3.9g/cm3

Water absorption :

ROHS Hardness :

≥85

Flexural strength :

358(52) - 550 Mpa(psix10^3)

Compressive Strength :

2068(300) - 2600(377) Mpa(psix10^3)

Coefficient of thermal expansion :

7.6 - 8.2 / 1X10^-6/℃

Coefficient of thermal conductivity :

16-30.4 / W/m.K

Thermal Shock Resistance :

250℃

Dielectricity constant :

9-9.7 / 1MHz.25℃

Dielectric strength :

8.3(210) - 8.7(220) / ac-kV/mm(ac V/mil)

Volume Resistivity :

>10^13 ohm-cm

Description

High Precision 99 Alumina Ceramic Components Machining Parts

1. Description:

Alumina is a very hard ceramic and is excellent at resisting abrasion. It is ideal for wear-resistant inserts or products. Alumina is commonly used as a high temperature electrical insulator, particularly the higher purity grades which offer better resistivity. Alumina also offers good resistance to strong acids and alkalis at elevated temperatures and is ideal for applications where resistance to corrosive substances is required. Some common applications of Alumina include:

Electronic components & substrates
High temperature electrical insulators
High voltage insulators
Laser tubes
Machine components
Mechanical seals
Precision shafts and axles in high wear environments
Roller and ball bearings
Seal rings
Semiconductor parts
Shot blast nozzles
Thermocouple tubes
Tap plates
Valve seats
Wear components
Wire and thread guides
Ballistic Armor

2. Feature Advantages:

1) High elasticity modulus

2) High compressive strength.

3) Anti corrosion

4) Abrasion resistance

5) Impact resistance

6) High precision

7) High stability

8) Good advanced ceramic materials

9) High welding sealing performance

10) High hardness and high density

11) Low thermal conductivity

12) Chemical inertness

13) Good wear resistance

14) High Fracture toughness

15) Good insulation performance

16) High temperature resistance

17) A variety of specifications is available

18) Satisfy various technical requests

19) Lower medium spoilage

20) Stiffness texture

21) Widely apply for automotive ceramic sensor , ceramic heater ,electric heating

3. Material Features / Properties:

Composite	(wt %)	99%	99.5%	99.8%
Color		White or Ivory	White or Ivory	White or Ivory
Density	g/cm 3	3.82	3.9	3.92
Hardness	HRA	83	85	85
Flexural Strength	Mpa (psi*10 3 )	375	386	381

4. Technical Parameters:

Technical Parameters of Ceramics
Items	Test Conditions	Unit or Symbol	99% AL2O3	95% AL2O3	90% AL2O3	Zirconia	Steatite	Silicon Carbide
Volume Density	--	g/cm3	≥3.70	≥3.62	≥3.40	≥5.90	≥2.60	≥3.08
Tightness	--	Pa·m³/s	≤1.0×10-11	≤1.0×10-11	≤1.0×10-11	-	-	-
Liquid Permeability	--	--	Pass	Pass	Pass		Pass	-
Flexural Strength	-	MPa	≥300	≥280	≥230	≥1100	≥120	≥400
Elastic Modulus	-	GPa	-	≥280	≥250	≥220	-	400
Poisson Ratio	-	-	-	0.20～0.25	0.20～0.25	-	-	-
Thermal Shock Resistance	800℃( Room Temperature) Cycle: 10 times		Pass	Pass	Pass	-	-	-
Coefficient of Linear Expansion	20℃～100℃	×10-6 K-1	-	-	-		≤8	-
	20℃～500℃	×10-6 K-1	6.5～7.5	6.5～7.5	6.5～7.5	6.5～11.2	-	-
	20℃～800℃	×10-6 K-1	6.5～8.0	6.5～8.0	6.3～7.3		-	4
	20℃～1200℃	×10-6 K-1	-	7.0～8.5	-	-	-	-
Coefficient of Thermal Conductivity	20℃	W/(m·k)	-	-	-	-	-	90～110
Coefficient of Thermal Conductivity	1000℃	W/(m·k)	-	-	-	-	-	90～110
Dielectric Constant	1MHz 20℃	-	9.0～10.5	9.0～10	9.0～10	-	≤7.5	-
	1MHz 50℃	-	-	9.0～10	-	-	-	-
	10GHz 20℃	-	9.0～10.5	9.0～10	9.0～10	-	-	-
Volume Resistivity	100℃	Ω·cm	≥1.0×1013	≥1.0×1013	≥1.0×1013	-	≥1.0×1012	-
	300℃		≥1.0×1013	≥1.0×1010	≥1.0×1013	-	-	-
	500℃		≥1.0×109	≥1.0×108	--	-	-	-
Disruptive Strength	D.C	kV/mm	≥17	≥15	≥15	-	≥20	-
Chemical Durability	1:9HCl	mg/c㎡	≤0.7	≤7.0	-	-	-	-
Chemical Durability	10%NaOH	mg/c㎡	≤0.1	≤0.2	-	--	-	-
Grain Size	-	μm	-	3~12	-	-	-	-

5. Process Flows:

Formulating --- Granulating --- Forming --- Sintering --- Grinding --- Inspecting --- Packing