High-efficiency synthesis process for large-cavity diamond

Abstract

The invention belongs to the technical field of diamonds, and particularly relates to a large-cavity diamond efficient synthesis process which comprises the following steps: (1) raw material preparation: raw material selection and raw material synthesis; (2) diamond synthesis: drying, high-temperature and high-pressure treatment, and cooling and depressurizing; and (3) subsequent treatment: polishing and cleaning. By selecting raw materials, workers can conveniently adjust the purity of manufactured diamonds according to manufacturing requirements, by arranging drying, synthetic blocks manufactured by the diamond raw materials can be conveniently dried, the quality and stability of the raw materials are improved, the self-quality of products is reduced, and the production efficiency is improved; residual scraps generated during diamond grinding can be conveniently cleaned, and the situation that the scraps remain on the surface of the diamond for a long time and corrode the diamond is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of diamonds, and in particular relates to a high-efficiency synthesis process of large-cavity diamonds. Background Art

[0002] Diamond is a mineral composed of carbon. It is an allotrope of graphite with a chemical formula of C. It is also the original form of common diamond. Diamond is the hardest substance naturally existing in nature. Graphite can form artificial diamond under high temperature and high pressure;

[0003] In order to produce diamond, a large cavity diamond efficient synthesis process is proposed. Summary of the invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides a large cavity diamond efficient synthesis process, which has the characteristics of convenient production.

[0005] To achieve the above object, the present invention provides the following technical solution: a large cavity diamond efficient synthesis process, comprising the following steps:

[0006] (1) Raw material preparation

[0007] Raw material selection: select high purity graphite, metal catalyst (such as Fe, Co, Ni, Mo, Ti, etc., among which Ni and Co produce smaller diamond particles and better crystal quality) and pyrophyllite;

[0008] Raw material synthesis: Mix the selected graphite, metal catalyst and pyrophyllite evenly, place the mixture in a film and press it into a synthetic block;

[0009] (2) Diamond synthesis

[0010] Drying: Place the synthetic block in a dryer for drying;

[0011] High temperature and high pressure treatment: the synthetic block is placed in a six-sided top press, and then heated and pressurized. The temperature is between 1500℃ and 2500℃. The high temperature causes the graphite molecules to rearrange. The pressure is above 50000Pa. The high pressure causes the graphite atoms to rearrange. The synthetic block is quickly converted into diamond under the action of high temperature and high pressure. The six-sided top press maintains the temperature and pressure, and the diamond crystals grow within a certain time range. This process takes 10-15 minutes.

[0012] Cooling and depressurization: After the diamond crystal transformation is completed, the six-sided top press is quickly cooled to room temperature and the pressure is released;

[0013] (3) Subsequent processing

[0014] Grinding: First, the synthetic diamond needs to be roughly ground to remove the surface roughness of the diamond. A large amount of grinding fluid needs to be used during the grinding process to reduce the heat generated by grinding and the harm of grinding chips. Then the grinding surface is carefully trimmed. It is necessary to select appropriate polishing powder and polishing agent, apply them to the surface to be ground, and then perform rotary polishing;

[0015] Cleaning: Clean the polished diamond.

[0016] Preferably, in step (1), the selected graphite, metal catalyst and pyrophyllite raw materials are placed in a blender and stirred and mixed.

[0017] Preferably, in step (2), the raw material synthesis block is placed in a dryer for drying.

[0018] Preferably, in step (3), the diamond is placed in a cleaning machine, an appropriate amount of detergent is added, and the cleaning machine is turned on for cleaning. After the cleaning is completed, the diamond is taken out, rinsed with clean water, and then dried with a hair dryer or naturally.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention facilitates the staff to adjust the purity of diamond according to production requirements through raw material selection, and facilitates the drying of synthetic blocks made of diamond raw materials by setting drying, thereby improving the quality and stability of raw materials, reducing the quality of products themselves, and improving production efficiency. Through cleaning, it is convenient to clean up the debris left over from diamond grinding, thereby preventing debris from remaining on the diamond surface for a long time and causing erosion to the diamond. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 Flowchart for preparing raw materials in the present invention;

[0023] Figure 2 is a flow chart of diamond synthesis in the present invention;

[0024] Figure 3 It is a flow chart of the subsequent processing in the present invention. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Example 1

[0027] See also Figure 1-3 The present invention provides the following technical solution: a large cavity diamond efficient synthesis process, comprising the following steps:

[0028] (1) Raw material preparation

[0029] Raw material selection: select high purity graphite, metal catalyst (such as Fe, Co, Ni, Mo, Ti, etc., among which Ni and Co produce smaller diamond particles and better crystal quality) and pyrophyllite;

[0030] Raw material synthesis: Mix the selected graphite, metal catalyst and pyrophyllite evenly, place the mixture in a film and press it into a synthetic block;

[0031] (2) Diamond synthesis

[0032] Drying: Place the synthetic block in a dryer for drying;

[0033] High temperature and high pressure treatment: the synthetic block is placed in a six-sided top press, and then heated and pressurized. The temperature is between 1500℃ and 2500℃. The high temperature causes the graphite molecules to rearrange. The pressure is above 50000Pa. The high pressure causes the graphite atoms to rearrange. The synthetic block is quickly converted into diamond under the action of high temperature and high pressure. The six-sided top press maintains the temperature and pressure, and the diamond crystals grow within a certain time range. This process takes 10-15 minutes.

[0034] Cooling and depressurization: After the diamond crystal transformation is completed, the six-sided top press is quickly cooled to room temperature and the pressure is released;

[0035] (3) Subsequent processing

[0036] Grinding: First, the synthetic diamond needs to be roughly ground to remove the surface roughness of the diamond. A large amount of grinding fluid needs to be used during the grinding process to reduce the heat generated by grinding and the harm of grinding chips. Then the grinding surface is carefully trimmed. It is necessary to select appropriate polishing powder and polishing agent, apply them to the surface to be ground, and then perform rotary polishing;

[0037] Cleaning: Clean the polished diamond.

[0038] Specifically, in step (1), the selected graphite, metal catalyst and pyrophyllite raw materials are placed in a blender and stirred and mixed.

[0039] Specifically, in step (2), the raw material synthesis block is placed in a dryer for drying.

[0040] Specifically, in step (3), the diamond is placed in a cleaning machine, an appropriate amount of detergent is added, and the cleaning machine is turned on for cleaning. After the cleaning is completed, the diamond is taken out, rinsed with clean water, and then dried with a hair dryer or naturally.

[0041] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A large cavity diamond high efficiency synthesis process, comprising the following steps, characterized in that: (1) Raw material preparation Raw material selection: select high purity graphite, metal catalyst (such as Fe, Co, Ni, Mo, Ti, etc., among which Ni and Co produce smaller diamond particles and better crystal quality) and pyrophyllite; Raw material synthesis: Mix the selected graphite, metal catalyst and pyrophyllite evenly, place the mixture in a film and press it into a synthetic block; (2) Diamond synthesis Drying: Place the synthetic block in a dryer for drying; High temperature and high pressure treatment: the synthetic block is placed in a six-sided top press, and then heated and pressurized. The temperature is between 1500℃ and 2500℃. The high temperature causes the graphite molecules to rearrange. The pressure is above 50000Pa. The high pressure causes the graphite atoms to rearrange. The synthetic block is quickly converted into diamond under the action of high temperature and high pressure. The six-sided top press maintains the temperature and pressure, and the diamond crystals grow within a certain time range. This process takes 10-15 minutes. Cooling and depressurization: After the diamond crystal transformation is completed, the six-sided top press is quickly cooled to room temperature and the pressure is released; (3) Subsequent processing Grinding: First, the synthetic diamond needs to be roughly ground to remove the surface roughness of the diamond. A large amount of grinding fluid needs to be used during the grinding process to reduce the heat generated by grinding and the harm of grinding chips. Then the grinding surface is carefully trimmed. It is necessary to select appropriate polishing powder and polishing agent, apply them to the surface to be ground, and then perform rotary polishing; Cleaning: Clean the polished diamond.

2. The large cavity diamond high efficiency synthesis process according to claim 1, characterized in that: In the step (1), the selected graphite, metal catalyst and pyrophyllite raw materials are placed in a mixer and stirred and mixed.

3. The large cavity diamond high efficiency synthesis process according to claim 1, characterized in that: In the step (2), the raw material synthesis block is placed in a dryer for drying.

4. The large cavity diamond high efficiency synthesis process according to claim 1, characterized in that: In the step (3), the diamond is placed in a cleaning machine, an appropriate amount of detergent is added, and the cleaning machine is turned on to perform a cleaning operation. After the cleaning is completed, the diamond is taken out, rinsed with clean water, and then dried with a hair dryer or naturally.

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