Product Details

Alumina ceramic eyelet for textile machine,Ceramic eyelet

The ceramic eyelet(ceramic ring) is the most commonly used component for the wire passing, and it is used in the wire passing position of the coil winding machine and the textile machinery. Normally it is used for less demanding occasions. The shape, finish and the hardness of materials must be improved in order to reduce the friction because of the wire sliding in the surface of the ceramic rings. According to the requirements, the Polish degree of porcelain eye can be regarded as roughness polishing, precision polishing and ultra-precision polishing.

Features:

1. The inside surface Polish degree: Ra0.2~0.8.
2. The material: 99% AI2O3 with density of 3.85.
3. The hardness: HRa88.

4. Material:

a) 95% Al2O3

b) 99.5% Al2O3

c) TiO2

d) 3Y-ZrO2

5. Other materials available upon request

6. Tolerance: according DIN 7168 -1 ( m)

7.Surface roughness: Ra 0.2- 1.0μm

8.Vickers hardness: 1,8002,000

9.Custom products available

Item	Testing condition	Unit	75% al2o3	90% al2o3	95% al2o3	99% al2o3	99.5% al2o3	zirconia	steatite
Bulk density		g/cm³	>3.20	>3.40	>3.60	3.7	3.7	6	≥2.6
Flexural Strength		N/m²×10³	1.96	2.25	2.24	>2.24	>2.74	11	1.37
Coefficient of linear expansion	20~800°C	×10^-6/°C	/	6.3~7.3	6.5~8.0	6.5~8.0	6.5~8.0	9.5	≤8
Permittivity	1MHz		≤9	8.5~9.5	9~10	9~10.5	9~10.5	/	≤7.5
Permittivity	10GHz		/	/	9~10	9~10.5	/	/	/
Insertion loss	1MHz	×10^-6	≤10	≤8	≤4	≤2.5	≤1.5	/	≤8.0
Insertion loss	10GHz	×10^-6	/	/	≤10	≤6	/	/	/
Bulk density resistance	100°C	Ω·Cm	>10¹²	>10¹³	>10¹³	>10¹³	>10¹⁴	>10¹²	>10¹²
Puncture strength		KV/mm	20	15	15	15	/	/	20
Thermal conductivity	20°C	W/m·k	/	16.8	25.2	25.2	29.2	3	2.9