A preparation method of carbon source for synthesizing large-scale polycrystalline diamond
A polycrystalline diamond, large-scale technology, applied in chemical instruments and methods, ultra-high pressure processes, graphite and other directions, can solve problems such as inconclusive results, achieve high forming density, reduce pressure and temperature, and reduce losses. Effect
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preparation example Construction
[0021] The invention provides a preparation method of a carbon source for synthesizing large-scale polycrystalline diamond, which specifically comprises the following steps:
[0022] 1) Screen the flake graphite for grain size, and take ≤600 mesh as the sample to be treated;
[0023] 2) Put the sample to be processed obtained in step 1) into a ball mill, add alcohol and mix it into a paste, then add steel balls, and perform ball milling on the ball mill for 8-30 hours;
[0024] 3) After the ball milling is completed, use pure water to flush the ball-milled graphite into the beaker, re-classify the particle size, select ≤5000 mesh and then precipitate;
[0025] 4) Pour off the precipitation clear water, add hydrochloric acid and boil on an electric heating furnace for half an hour, further remove impurities, wash with pure water after natural cooling to neutrality, and dry the precipitate obtained after precipitation in a vacuum drying oven;
[0026] 5) The dried precipitate i...
Embodiment approach
[0028] As an embodiment of the present invention, the purity requirements of the graphite flakes described in step 1) of the preparation method are very high, requiring ≥99.99%, and the graphite flakes of this purity can be purchased from LC(-) of Qingdao Baichuan Graphite Co., Ltd. 325-9999 type flake graphite, the purpose of using high-purity flake graphite is to reduce the impurity content in synthetic polycrystalline diamond and ensure the quality of polycrystalline diamond.
[0029] As an embodiment of the present invention, the mass of the steel balls added in step 2) of the preparation method is 10-20 times the mass of the flake graphite of the sample to be treated. As another embodiment of the present invention, the steel balls have three sizes of 6 mm, 8 mm and 10 mm, and are used in a mixture in a mass ratio of 2:3:5.
[0030] As an embodiment of the present invention, the ball mill used in step 2) of the preparation method is an iron ball mill. The reason for using ...
Embodiment 1
[0034] In this example, the flake graphite was screened by a vibration screening machine for grain size, and 325-400 mesh was selected as the sample to be processed, 100 grams of graphite was taken from it, put into an iron ball mill, and an appropriate amount of alcohol was added to mix it into a paste. Add steel balls whose mass ratio is 10 times the weight of graphite (steel balls are 6mm, 8mm, and 10mm in three sizes and mixed in a mass ratio of 2:3:5), tighten the ball mill jar to start ball milling, ball mill for 8 hours, and then use pure Pour the ball-milled graphite into a beaker with water, re-classify the particle size, select a particle size section below 700 mesh and then precipitate; pour out the precipitated water, add an appropriate amount of hydrochloric acid, boil it on an electric furnace for half an hour, further remove impurities, and cool it naturally After washing with pure water until neutral, the precipitate obtained after precipitation was dried in a v...
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