High temperature oxidation-resistant graphite ceramic composite material and preparation method thereof
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A ceramic composite material, high temperature anti-oxidation technology, applied in the field of inorganic non-metallic material forming, can solve problems such as lack of process methods, and achieve the effect of ensuring adhesion performance, good high-temperature oxidation resistance, and increasing strength
Active Publication Date: 2019-02-12
CHINA THREE GORGES UNIV
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[0004] To sum up, the existing high-temperature anti-oxidation methods of graphite materials have their own advantages and disadvantages, and they are aimed at artificial graphite materials. However, there is currently a lack of corresponding processes for how to improve the high-temperature anti-oxidation ability of natural graphite functional structural parts.
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Embodiment 1
[0040] The specific preparation steps of embodiment 1 are as follows:
[0041] (1) Preparation of mixed powder
[0042] Natural flake graphite (carbon content greater than 95%, 150-270 mesh), thermosetting phenolic resin powder (500 mesh), high-purity silicon powder (chemical purity 99%, 200 mesh) and boron carbide powder (chemical purity 99 %, 200 mesh) according to the mass ratio of 41:25:24:10 and mix evenly.
[0043] (2) Design and preparation of three-dimensional porous graphite
[0044] According to the uniform arrangement and distribution, the maximum characteristic size of the square hole is 8mm to design the graphite green body, and the selective laser powder sintering forming technology is adopted according to the layer thickness of 0.1mm, the filling distance of 0.1mm, the filling speed of 1500mm / s, the filling power of 17w, and the contour speed of 1000mm / s, profile power 10w, preheating temperature 40°C process parameters to quickly prepare three-dimensional po...
Embodiment 2
[0052] Embodiment 2 concrete preparation steps are as follows:
[0053] (1) Preparation of mixed powder
[0054] Natural flake graphite (carbon content greater than 95%, 150-270 mesh), thermosetting phenolic resin powder (500 mesh), high-purity silicon powder (chemical purity 99%, 200 mesh) and boron carbide powder (chemical purity 99 %, 200 mesh) according to the mass ratio of 46:25:24:5 and mix evenly.
[0055] (2) Design and preparation of three-dimensional porous graphite
[0056] According to the uniform arrangement and distribution, the maximum characteristic size of circular holes is 4mm, and the graphite green body is designed, and the selective laser powder sintering forming technology is adopted according to the layer thickness of 0.1mm, the filling distance of 0.2mm, the filling speed of 1500mm / s, the filling power of 20w, and the contour speed of 800mm. / s, profile power 10w, and preheating temperature 40°C process parameters to quickly prepare three-dimensional ...
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Abstract
The invention discloses a high temperature oxidation-resistant graphite ceramic composite material and a preparation method thereof; the composite material is prepared from ceramics and a three-dimensional porous graphite blank body. Graphite is prepared into a three-dimensional porous structure, the internal pores of the graphite are communicated with each other and are filed with the ceramics, the pore sizes are controlled to be 10 mm or less, and the volume of the three-dimensional porous graphite accounts for at least 50% of the total volume of the graphite ceramic composite material. During preparation, a graphite / phenolic resin mixed powder containing silicon powder / boron carbide powder is used to rapidly prepare the three-dimensional porous graphite blank body by means of a selective laser sintering molding technology, and secondary curing, densification and carbonization treatment are performed on the graphite blank body, silica sol is impregnated in the treated graphite blankbody, the ceramic slurry is poured into the graphite blank body after the graphite blank body is dried, and vacuum freeze-drying and high-temperature sintering are carried out, so that the high temperature oxidation-resistant graphite ceramic composite material is obtained. The composite material prepared by the method not only guarantees the bonding performance between powder and the uniform arrangement and distribution of blank bodies, but also enhances the good interface bonding property between the ceramics and the graphite and has improved the strength.
Description
technical field [0001] The invention relates to a high-temperature oxidation-resistant graphite ceramic composite material and a preparation method thereof, belonging to the technical field of forming inorganic non-metallic materials. technical background [0002] Graphite materials have excellent high-temperature mechanical properties, good thermal shock resistance, corrosion resistance, and thermal conductivity, and are widely used in many fields. Generally, the shape, size and structure (such as hollow cavity) of the artificial graphite blank are obtained after machining, and are used as casting molds or molds for the production of non-ferrous alloys, cast steel and other metal parts or diamond-metal composite parts. To reduce production costs, graphite molds or molds must meet the requirements of repeated use. However, under aerobic conditions, when the ambient temperature is higher than 500°C (due to the difference in the graphite matrix material and the degree of grap...
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