| 摘要 |
An alumina/graphite composite ceramic material comprises alumina ceramic material and graphite powder, wherein the mass ratio of alumina ceramic material and graphite powder is 100:5~100:15, and the alumina ceramic material comprises alumina powder, talcum powder, wollastonite powder, and barium carbonate powder at the mass ratio of 100:10~20:10~20:1~5. An LED light source utilizing the alumina/graphite composite ceramic material as substrate comprises a heat-dissipating substrate, metal wirings (6) printed on the heat-dissipating substrate, an LED chip (1) packaged on the heat-dissipating substrate, fluorescent powder (5) and an optical lens (2), wherein the heat-dissipating substrate is an alumina/graphite composite ceramic substrate (3), metal conductive layers (6) are printed on the composite ceramic substrate (3), and the LED chip (1) is directly mounted on the composite ceramic substrate (3). |
