CN202061599U

CN202061599U - Square-cap type conductive steel ring

Info

Publication number: CN202061599U
Application number: CN2011200909317U
Authority: CN
Inventors: 薛胜辉; 丁庆才; 刘广利
Original assignee: Zhengzhou Synthetic Diamond and Products Engineering Technology Research Center Co Ltd
Current assignee: Zhengzhou Synthetic Diamond and Products Engineering Technology Research Center Co Ltd
Priority date: 2011-03-31
Filing date: 2011-03-31
Publication date: 2011-12-07
Anticipated expiration: 2021-03-31

Abstract

The utility model discloses a square-cap type conductive steel ring, which comprises a square-cap type steel ring. A pyrophyllite ring and a dolomite ring are sleeved on the square-cap type steel ring from top to bottom, and a pyrophyllite core and a dolomite core are filled inside the square-cap type steel ring from top to bottom. When the square-cap type conductive steel ring is used for diamond synthesis operation, local over-high temperature can be eliminated, and a uniform and stable pressure temperature field can be supplied for growth of diamonds. Since dolomite is sleeved on pyrophyllite of the square-cap steel ring, coefficient of thermal expansion of dolomite is high and is 3.4 times of that of the pyrophyllite, and water-free dolomite is free of phase change under high temperature and high pressure, reduction of pressure in a high-pressure cavity caused by phase change of the pyrophyllite ring and the pyrophyllite core under high temperature and high pressure can be compensated by the dolomite after the pyrophyllite is combined with the dolomite, pressure inside the cavity can be increased in disguised manner, external surface pressure for diamond synthesis can be reduced, and then the service life of synthesis equipment can be prolonged.

Description

A kind of doctorial hat's conducting steel ring

Technical field

The utility model belongs to the diamond synthesis technical field, particularly a kind of doctorial hat's conducting steel ring.

Background technology

What domestic diamond synthesis mainly adopted is static pressure catalyst method, the indirect mode assembled block of static pressure catalyst method under superhigh-temperature and-pressure (synthetic piece) is by the used raw material graphite post of diamond synthesis, i.e. graphite and catalyst mixed powder and be positioned at the conducting steel ring at graphite post two ends and blocks that heating element heater, insulation component, the pressure transmission sealing medium pyrophyllite in lumps of graphite post periphery assemble according to certain way.The indirect assembling mode is from outside to inside: peripheral pyrophyllite and the dolomite complex media of adopting is as the pressure transmission encapsulant, the conducting steel ring heating of switching on is adopted at two ends, conducting steel ring closely contacts with its inboard heating element heater, make heating element heater heating itself by conducting steel ring during energising, pass through then and the inboard insulation component that closely contacts of heating element heater, see through insulation component heat is reached and the inboard graphite post that closely contacts of insulation component, make graphite under superhigh-temperature and-pressure, be converted into diamond.The conducting steel ring at synthetic piece two ends is: the synthetic piece under the HTHP adopts metal (ferroalloy etc.) material of doctorial hat's shape to heat as the graphite post of conductor to synthetic piece inside at two ends, make graphite be converted into diamond under HTHP.Conducting steel ring is placed on the two ends of pyrophyllite in lumps, plays the effect of conduction heat transfer, pressure transmission, protection carbide alloy.Packaging technology is: the conducting steel ring in the synthetic piece, form by doctorial hat's steel ring and pyrophyllite ring, dolomite core; As shown in Figure 1, during assembling, pyrophyllite ring 3 and dolomite core 2 are sleeved on doctorial hat's steel ring 1, form conducting steel ring.Utilize indirect assembling mode diamond synthesis, because heat transfer type is inwardly conducted heat by peripheral heating tube, it is uniform and stable to conduct heat, if still adopt former conducting steel ring mode, certainly will cause local temperature height in the middle of the two ends, and the pyrophyllite of doctorial hat's steel ring periphery undergoes phase transition under HTHP, promptly under 5.5 ~ 6.0Gpa of diamond suitable growth condition, temperature is when 1620 ~ 1720K, the crystallization water in the pyrophyllite impels pyrophyllite to be phase-changed into kyanite to add coesite, make the pyrophyllite volume contraction reach itself 12.6%.This phase transformation and the volume contraction that is accompanied by cause the high pressure chest internal pressure to descend, and have a strong impact on the diamond film environment in the synthetic chamber, cause unstable product quality.

The utility model content

The purpose of this utility model provides a kind of doctorial hat's conducting steel ring that can remedy the phase transformation of pyrophyllite HTHP.

For achieving the above object, the technical solution adopted in the utility model is:

A kind of doctorial hat's conducting steel ring comprises doctorial hat's steel ring, is set with pyrophyllite ring, white clouds stone ring on doctorial hat's steel ring from top to bottom, and doctorial hat's steel ring inside is filled with pyrophyllite core, dolomite core from top to bottom.

The pyrophyllite ring thickness is identical with pyrophyllite core thickness, and the dolomite ring thickness is identical with dolomite core thickness, and the pyrophyllite ring thickness is 2:1 with the ratio of dolomite ring thickness, and pyrophyllite core thickness is 2:1 with the ratio of dolomite core thickness.

The beneficial effect that brings in the utility model is: 1. white clouds stone ring and dolomite core evenly are sleeved on the pyrophyllite ring and pyrophyllite core of doctorial hat's steel ring, because dolomite thin thickness and radial distribution are even, with improve before compare: can eliminate the high phenomenon of local temperature, can provide one evenly and the pressure stable temperature field for growth of diamond; 2. use dolomite to be sleeved on the pyrophyllite of doctorial hat's steel ring, because the dolomite thermal coefficient of expansion is big, be 3.4 times of pyrophyllite, and it is not moisture, do not undergo phase transition under the HTHP, the two in conjunction with dolomite can remedy pyrophyllite ring and pyrophyllite core under HTHP because the high pressure chest internal pressure that phase transformation causes descends, in a disguised form improve the synthetic cavity internal pressure, reduce the synthetic outside gauge pressure of using, the service life of improving synthesis device.

Description of drawings

Fig. 1 is existing doctorial hat's conducting steel ring structural representation;

Fig. 2 is the utility model structural representation.

The specific embodiment

As shown in Figure 2, a kind of doctorial hat's conducting steel ring comprises doctorial hat's steel ring 1, is set with pyrophyllite ring 3, white clouds stone ring 5 on doctorial hat's steel ring 1 from top to bottom, and doctorial hat's steel ring 1 inside is filled with pyrophyllite core 4, dolomite core 6 from top to bottom.Pyrophyllite ring 3 thickness are identical with pyrophyllite core 4 thickness, and white clouds stone ring 5 thickness are identical with dolomite core 6 thickness, and pyrophyllite ring 3 thickness are 2:1 with the ratio of white clouds stone ring 5 thickness, and pyrophyllite core 4 thickness are 2:1 with the ratio of dolomite core 6 thickness.

When the utility model is made, pyrophyllite in powder is added the binding agent bath of glass be pressed into pyrophyllite ring 3, internal diameter equals the external diameter of doctorial hat's steel ring wall 1-2, and external diameter equals the external diameter of doctorial hat's steel ring sheet 1-1, is sleeved on doctorial hat's steel ring 1; Dolomite dust is added the binding agent bath of glass be pressed into white clouds stone ring 5, internal diameter equals the external diameter of doctorial hat's steel ring wall 1-2, and external diameter equals the external diameter of doctorial hat's steel ring sheet 1-1, is sleeved on the pyrophyllite ring 3 on doctorial hat's steel ring 1; Both thickness equal the thickness of doctorial hat's steel ring sheet to the steel ring bottom.Pyrophyllite in powder is added the binding agent bath of glass be pressed into pyrophyllite core 4, cylindrical equals the internal diameter of doctorial hat's steel ring wall 1-2, is filled in the internal diameter of doctorial hat's steel ring 1; Dolomite dust is added the binding agent bath of glass be pressed into dolomite core 6, cylindrical equals the internal diameter of doctorial hat's steel ring wall 1-2, is filled on the pyrophyllite core 4 in doctorial hat's steel ring 1 internal diameter; Because dolomite thin thickness and radial distribution are even, can eliminate the high phenomenon of local temperature, can provide an even and pressure stable temperature field for growth of diamond; Use dolomite to be sleeved on the pyrophyllite of doctorial hat's steel ring, because the dolomite thermal coefficient of expansion is big, be 3.4 times of pyrophyllite, and it is not moisture, do not undergo phase transition under the HTHP, the two in conjunction with dolomite can remedy pyrophyllite ring and pyrophyllite core under HTHP because the high pressure chest internal pressure that phase transformation causes descends, in a disguised form improve the synthetic cavity internal pressure, reduce the synthetic outside gauge pressure of using, the service life of improving synthesis device.

Claims

1. doctorial hat's conducting steel ring comprises doctorial hat's steel ring, it is characterized in that, is set with pyrophyllite ring, white clouds stone ring on doctorial hat's steel ring from top to bottom, and doctorial hat's steel ring inside is filled with pyrophyllite core, dolomite core from top to bottom.

2. doctorial hat's conducting steel ring as claimed in claim 1, it is characterized in that, the pyrophyllite ring thickness is identical with pyrophyllite core thickness, the dolomite ring thickness is identical with dolomite core thickness, the pyrophyllite ring thickness is 2:1 with the ratio of dolomite ring thickness, and pyrophyllite core thickness is 2:1 with the ratio of dolomite core thickness.