Ceramic Threaded Rods Thermally Resistance Ceramic Rods

Materials：Alumina (Al₂O₃)/ Zirconia(ZrO₂) /Si₃N₄ /SiC ...etc

Sizes：Mini OD: 0.02mm; Max length: 500mm

Delivery times：2 -25 days(depends on the quantity)

Precision：Ra 0.1um tolerance: 0.001mm... etc

Features：Heat resistance / Wear resistance / High purity / Refractory / High Corrosion / Good Insulation...

Customized：Can be custom for special sizes and shapes

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	Al₂O₃	ZrO₂/Y₂O₃	ZrO₂/MgO	MgO	SiC	Si₃N₄ Reaction sintered	Si₃N₄ Hot pressed	ALN
Physical properties
Density (g/cm³)	3,9	5,9	5,75	3,58	3,2	3,27	3,29	3,26
Molecular weight (g/mole)	102	-	-	40,4	40,1	140	140	41
Maximum service temperature air (°C)	1700- 1800	1500	1000	2200	1500	1200- 1500	1100- 1600	1000- 1800
Mechanical properties
Hardness (Mohs)	9	-	-	5,5	9	-	-	7
Modulus of elasticity (GPa)	300-400	200	200	250-300	420	170-220	280-310	318
Poisson's ratio	0,25	-	-	0,18	0,14	0,25-0,26	0,27	0,25
Fracture toughness (MPa.m1/2)	2-3	7-13	6-10	-	2,5-3,5	3,5-5	6,1	4,5
Electrical properties
Dielectric constant	9-10	-	-	9-10	-	10	10	9,2
Electrical resistivity at 20°C (Ohm.cm)	>10₁₄	10₁₃-10₁₄	>10₁₀	-	10₂-10₆	>10₇	10₁₂- 10₁₅	>10₁₄
Dielectric strength (kV/mm)	10-20	9	2-10	-	-	-	-	15
Thermal properties
Specific heat (J/K/kg)	900	400-500	420	870-880	750	690	680-800	800
Thermal conductivity (W/m/K) at 20°C	26-35	2,2-3,2	1,5-2,5	40-50	63-155	9-30	15-43	180
Coefficient of thermal expansion ( 10-6) from 20 to 1000°C	8-9	10-11	5-16	10-13	4-5	3	3,3	4,4-5,3
Melting point (°C)	2050	2590	-	2800	2500	1900	1900	2200

Technical reference of manufacture
Dimensional accuracy	Up to 0.001mm
Concentricity	Up to 0.003mm
Parallelism	Up to 0.002mm
The inner hole tolerance	The minimum 0.005mm
Straight flute	The narrowest 0.1x100mm
The thickness of the size	Minimum to 0.02mm
The screw thread	Minimum internal thread M2
Cylindricity	Up to 0.004mm
The linear tolerance	Up to 0.001mm
The smallest aperture	The minimum 0.07mm
Precision process	CNC maching,grinding,lapping
Surface finish	Glazed,polishing or metallized