Xingfeng Ceramics Factory Fengfeng Ceramics Co.,Ltd Xingchang Electronic Ceramics Research Institute

Current location：Electrical Ceramics

(A99 ceramics)
Essential components	99％Al₂O₃
Material characteristics	Density		g/cm³	3.8
	Water Absorption		％	O
	Agglomeration temperature		℃	1700
Physical characteristics	Hardness		HV	1700
	Anti—Folding Strength		Kgf/cm²	3500
	Compressive Strength		Kgf/cm²	30000
	Tenacity		Map.m^3/2	4
Thermodynamic property	Highest application temperature		℃	1500
	Thermal expansion coefficient O-lOOO℃		/℃	8*1O-6
	Heat resistance		T(℃)	200
	Thermal conductivity		W/m.k(25-300℃)	31.4 15.9
Electrical specification	Volume resistivity	20℃	>.cm	>1012
		100℃		1012-1013
		300℃		>1012
	Insulation breakdown intensity		KV/mm	18
	Dielectric constant		100MHz(E)	10

　　A99 ceramic axis，anti—friction，corrosion—resistant，high—temperature resistant；the product is widely used in ram pump，electromagnetic pump and kinds of immersion pumps．
　　Al₂O₃ obtains the best mechanical strength，with the smallest thermal conductivity coefficient，good electric insulation，small high—frequency loss，good durability and resistance to chemical attack in the oxide series．The products that contain 92％’s alumina can be used to spray coat the heat-durable metal surface． Those containing 96％’s alumina may be used in the thick-film circuit substrate and occasions requiring high mechanical strength．And those containing 99.5％may be served for the thin—film circuit substrate and other special uses．