Novel ternary thermal composite material and preparation method thereof
The invention discloses a novel ternary thermal composite material and a preparation method thereof. The material comprises the following components in volume ratio: at least 15vol% and at most 30vol% of Cu, at least 70vol% and at most 85vol% of W+diamond, at least 70vol% (W+diamond) and less than 100vol% (W+diamond) of W, and more than 0vol% (W+diamond) and at most 30vol% (W+diamond) of diamond. The preparation method comprises the following steps: selecting the raw materials including W, Cu and diamonds, weighing in proportion, mixing by using planetary ball milling, and then sintering by using vacuum hot-pressing to obtain a compact W-Cu-Diamond ternary thermal composite material. The novel ternary thermal composite material has the advantages of high compactness, uniform and stable texture structure, light weight, excellent mechanical property and thermal property and adjustable thermal expansion coefficient; the preparation process is simple and good in repeatability. 1. A novel ternary heat using the composite material, which is characterized in that that a kind of W-Cu-Diamond ternary composite material, its ingredient volume ratio is: 15vol % Cu≤ 30vol %, 70vol % ≤ (W+Diamond) ≤ 85vol %, 70vol % (W+Diamond)≤W < 100vol % (W+Diamond), < Diamond≤ 30vol % (W+Diamond) 0vol % (W+Diamond). 2. Ternary heat using the composite material according to Claim 1, which is characterized in that the cu the purity of 99.8%, the particle size of its powder the 1-5 m. 3. Ternary heat using the composite material according to Claim 1, characterized in that for the W purity of 99%, the particle size of its powder the 10-30 m. 4. Ternary heat using the composite material according to Claim 1, which is characterized in that the (diamond) Diamond of the purity of 99%, the particle size of its powder the 5-10 m. 5. A novel ternary heat used for the preparation method of composite material, which is characterized in that a cu powder, W powder, the regulator in accordance with the coefficient of thermal expansion of the volume fraction of powder Diamond cu / (W+Cu+Diamond) = 15-30vol %, (W+Diamond)/ (W+Cu+Diamond) = 70-85%, W / (W+Diamond) = 70-100vol %, Diamond / (W+Diamond) = 0-30vol % ball-grinding and mixing the mixture; then put into a vacuum hot pressing, vacuum hot pressing sintering furnace to, get W-Cu-Diamond ternary thermal control composite material; the vacuum hot-press sintering process to: vacuum degree is 1 × 10-3 -1 × 10-4 Pa, the sintering temperature is 1000-1150 the [...] , the holding time is 1-2h, applied pressure is 80-150MPa. 6. Preparation method according to Claim 5, which is characterized in that the cu the purity of 99.8%, the particle size of its powder the 1-5 m. 7. Preparation method according to Claim 5, characterized in that for the W purity of 99%, the particle size of its powder the 10-30 m. 8. Preparation method according to Claim 5, which is characterized in that the (diamond) Diamond of the purity of 99%, the particle size of its powder the 5-10 m. 9. Preparation method according to Claim 5, which is characterized in that the W, cu, with the grain size graded Diamond the principle of raw material preparation, W powder particle size of the large particle size, the particle size in the middle Diamond powder particle size, the particle size proportion is selected in the range of W: Diamond= 3:1-2:1, the effect of the particle size distribution.