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High-temperature insulation ceramic tube for synthesizing diamond with large cavity and manufacturing method thereof

A technology of synthetic diamond and high temperature insulation, applied in the process of applying ultra-high pressure, can solve problems such as increasing the risk of blasting hammer, and achieve the effect of reducing the risk of blasting hammer, ensuring the size of the pipe diameter, and avoiding gas release.

Inactive Publication Date: 2014-04-30
常熟市怡华金刚石有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

thus increasing the risk of explosion hammer

Method used

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  • High-temperature insulation ceramic tube for synthesizing diamond with large cavity and manufacturing method thereof
  • High-temperature insulation ceramic tube for synthesizing diamond with large cavity and manufacturing method thereof
  • High-temperature insulation ceramic tube for synthesizing diamond with large cavity and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In a nylon-lined steel ball mill jar with a length of 2.5m and a diameter of 1.5m, put a-alumina, talc, water, and magnesium stearate into the ball mill jar according to the mass ratio: 85 / 15 / 200 / 2. The mass ratio of raw material (alumina + talc) / corundum ball is 100 / 400, and the mass ratio of corundum balls with different diameters is: corundum ball with a diameter of 15-20mm: corundum ball with a diameter of 20-40mm: corundum ball with a diameter of 40-70mm =3:2:1. Ball mill at 20 rpm for 24 hours. After the corundum balls are separated, put the slurry in the pool for 1 hour, let a small amount of unground large-grained sand and stones trapped in the gap between the nylon plate lining the ball mill tank sink to the bottom of the pool; use mud for the upper layer of slurry Pump it into the batching tank, add the aqueous solution of polyvinyl alcohol according to the mass ratio of (alumina + talc) / polyvinyl alcohol at 100:1.5, stir evenly, and then granulate with a sta...

Embodiment 2

[0041] For a diamond composite press with a cylinder diameter of 750mm, the cavity diameter is 60mm. An insulating tube with a diameter of 56 mm was prepared according to the method of Example 1, and the relationship between the shrinkage rate in the longitudinal direction and the sintering temperature is shown in Table 3.

[0042] Table 3 Relationship between shrinkage rate and sintering temperature of 56mm ceramic tube in the length direction

[0043] temperature 850 900 1000 1050 1100 1150 1200 Shrinkage % 2.3 2.8 3.5 4.6. 6.6 7.65 8 Sintering weight loss % 6 6 6 6.1 6.1 6.1 6.1 Compressive strength / MPa 321 345 414 530 941 1130 1400

[0044] Replace the dolomite insulating tube with the prepared high-temperature insulating ceramic tube, synthesize diamond in a six-sided top press after assembly, prepare graphite columns according to catalyst: graphite = 25%: 75%, and prepare graphite columns for diamond synthesi...

Embodiment 3

[0050] The powder was prepared by basically the same process as in Example 1, wherein the ingredients were: magnesium oxide, talc, water, and magnesium stearate in a mass ratio of 85 / 15 / 250 / 2. Put into a ball mill jar, and ball mill for 16 hours at 10 rev / min. After granulation, the particle diameter of the dough is 0.3-0.8mm.

[0051] The molding and sintering conditions of the tube blank are the same as in Example 1, and a high-temperature insulating ceramic tube is obtained.

[0052] For a ceramic tube with a diameter of 38mm, the relationship between the shrinkage rate in the length direction and the sintering temperature is shown in Table 5:

[0053] Table 5 Relationship between shrinkage rate and sintering temperature in the length direction of 38mm ceramic tube

[0054] temperature 850 900 1000 1050 1100 1150 1200 Shrinkage % 2.2 2.8 3.4 4.6. 6.5 7.6 8 Sintering weight loss 11.3 11.3 11.3 11.3 11.7 12 12 Compressive strengt...

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Abstract

The invention discloses a high-temperature insulation ceramic tube for synthesizing diamond with a large cavity and a manufacturing method of the high-temperature insulation ceramic tube. The insulation ceramic tube is manufactured by pressing, molding and sintering dry ceramic powder, the ingredients of the dry powder comprises a-aluminum oxide or magnesium oxide with the purity higher than or equal to 99%, soapstone and / or kaolinite (being taken as sintering aids), magnesium stearate (being taken as a releasing agent) and polyvinyl alcohol (being taken as a binder), wherein the proportion of a-aluminum oxide or magnesium oxide, the sintering aids, the binder to magnesium stearate is (75-90):(10-25):(1-2):(1-2). The manufacturing method of the high-temperature insulation ceramic tube comprises the steps of preparing slurry by wet ball-milling process according to the proportion, conducting spray granulation on the slurry to prepare the dry ceramic powder; and pressing, molding and sintering the dry ceramic powder to prepare the high-temperature insulation ceramic tube. The high-temperature ceramic tube replaces dolomite to be used for the production of the diamond synthesized by a cubic press with the diameter of a cavity being more than or equal to 40mm, can avoid the gas release in the diamond synthesizing process so as to reduce the hammer explosion risk, and effectively reduces the loss rate of a tungsten carbide anvil.

Description

technical field [0001] The invention belongs to the technical field of high-pressure and high-temperature synthetic diamond in a six-sided top press, and specifically relates to a high-temperature insulating ceramic tube designed to improve the stability of a diamond synthesis process and reduce the loss of a tungsten carbide anvil and a preparation process thereof. Background technique [0002] Since the beginning of this century, my country's synthetic diamond industry equipment has undergone at least three upgrades. The cylinder diameter of the six-sided top press has been developed to a maximum of 750mm, and 850mm is still in the experimental stage. The increase of the bore of the oil cylinder makes the thrust of the piston stronger. Under the pressure conditions necessary for the graphite-diamond transformation, the tungsten carbide anvil with a larger size than before can be used to expand the volume of the synthesis cavity, increase the unit output, and reduce the en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J3/06
Inventor 李坤杨青松李政沈建民俞建名
Owner 常熟市怡华金刚石有限公司
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