CN201768539U

CN201768539U - Synthetic block capable of improving inner density

Info

Publication number: CN201768539U
Application number: CN2010202753224U
Authority: CN
Inventors: 薛胜辉; 林玉; 杨晋中; 彭献伟; 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: 2010-07-29
Filing date: 2010-07-29
Publication date: 2011-03-23
Anticipated expiration: 2020-07-29

Abstract

The utility model discloses a synthetic block capable of improving the inner density, which comprises a graphite column, electrical steel rings at two ends of the graphite column, and a pyrophyllite and dolomite composite medium around the graphite column and the electrical steel rings, wherein the core part of the graphite column is provided with a hollow cavity, the hollow cavity is internally and tightly matched with a filling block, and the density of the filling block is larger than that of the graphite column. As the inner density of the graphite column is obviously improved, the synthetic block can effectively reduce the synthesizing pressure of a synthesizing device, thereby prolonging the service life of cubic type press synthesizing equipment, leading each part of the graphite column to obtain enough synthesizing pressure, leading the graphite column to be evenly forced in each direction, effectively reducing the internal virtuality of the graphite column, and greatly improving the proportion of high-quality products.

Description

A kind of synthetic piece that improves internal density

Technical field

The utility model belongs to the superhard material synthesis technical field, particularly a kind of synthetic piece that improves internal density.

Background technology

In the synthetic field of superhard material, the synthetic piece under the superhigh-temperature and-pressure condition is the insulation component of the graphite post made by graphite and catalyst mixed powder, graphite post periphery and heating element heater, the conducting steel ring at graphite post two ends, the blocks that the pressure transmission sealing medium assembles according to certain way.Concrete assembling mode is: assembling successively 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 the heating element heater of inboard, make heating element heater heating itself by conducting steel ring during energising, insulation component through the inboard closely contact of heating element heater reaches heat and the inboard graphite post that closely contacts of insulation component then, makes graphite and catalyst be converted into diamond under the superhigh-temperature and-pressure condition.

In the diamond building-up process, though the pyrophyllite as transmission medium has good pressure transmission performance, but it can undergo phase transition under the superhigh-temperature and-pressure condition, be that the crystallization water in the pyrophyllite can impel pyrophyllite to be phase-changed into kyanite and coesite, volume contraction makes the pressure transmission performance of pyrophyllite reduce greatly.; the process that the later stage of diamond synthesis is diamond grain growth, grow up; just needing to transmit sufficient pressure this moment and supplementing the nutrients, impel diamond grain growth, grow up, and the reduction significantly of pyrophyllite pressure transmission performance will cause synthesis pressure to transmit deficiency; In addition, add in recent years the superhard material industry along with the continuous progress of technical merit, the synthetic cavity of diamond synthesis enlarges rapidly, from the assembling mode of synthetic piece, the graphite post is rendered as more and more littler pressure distribution situation, i.e. pressure distribution inequality from outside to inside, thereby cause in the synthetic piece empty, make the defective such as diamond particles air entrapment, impurity of generation many, and particle is little, has a strong impact on adamantine output and quality.

If raising synthesis pressure simply, transmit deficiency, graphite post upward pressure skewness to overcome synthesis pressure, synthesize in the piece defective such as void, the output of diamond product and quality can't be significantly improved and improve, and can directly have influence on the service life of cubic hinge press synthesis device and accessory thereof, severe patient directly causes the equipment blast of rupturing under high-temperature and high-pressure conditions to damage.This measure has not only improved production cost greatly, but also has bigger potential safety hazard.

The utility model content

The purpose of this utility model provide a kind of obtain sufficient synthesis pressure, graphite post stressed evenly, can subdue synthetic piece empty in the graphite post, that improve the raising internal density of quality product ratio.

For achieving the above object, the technical solution of the utility model is: a kind of synthetic piece that improves internal density, comprise the conducting steel ring at graphite post, graphite post two ends and the pyrophyllite and the dolomite complex media of graphite post and conducting steel ring periphery, described graphite post core is provided with cavity, tight fit is provided with filling block in the cavity, and filling block density is higher than the graphite column density.

Be provided with interior heating element heater between described filling block and the cavity wall.

The volume of described cavity is the 10%-50% of graphite column volume.

Between described conducting steel ring and the graphite post both ends of the surface, be equipped with outer heating element heater between pyrophyllite and dolomite complex media and the graphite post outer peripheral face.

Be provided with insulation component between described outer heating element heater and the graphite outer surface of column.

Compared with prior art, the utility model has the advantages that:

1, is provided with the filling block that density is higher than the graphite column density in the cavity of graphite post core, because graphite post internal density obviously improves, can effectively reduce the synthesis pressure of synthesis device, to prolong the service life of cubic hinge press synthesis device, make each position of graphite post all obtain sufficient synthesis pressure, each orientation of graphite post is stressed evenly, has effectively subdued void in the graphite post, has improved the ratio of quality product greatly.

2, be provided with interior heating element heater between filling block and the cavity wall, between conducting steel ring and the graphite post both ends of the surface, be equipped with outer heating element heater between pyrophyllite and dolomite complex media and the graphite post outer peripheral face, interior heating element heater and outer heating element heater are respectively from the inner and outside heat conduction simultaneously of graphite post, improved heat transfer efficiency greatly, can be balanced, stablize the interior temperature field of synthetic cavity, create stable growing environment to diamond, thereby improve adamantine output and quality.

3, on the surface, the filling block that improves graphite post internal density has occupied the certain volume of graphite post, influenced adamantine output, to transform adamantine amount herein very little but the interior empty situation of graphite post center makes, all the other diamond particles that change into everywhere are even, granularity increases slightly, quality is improved and the intervention of filling block can make, amid all these factors consider it is that the advantages outweigh the disadvantages, have favorable economic benefit.

4, in recent years, the rapid expansion of superhard material synthetic cavity, synthesis pressure improve greatly, directly threaten the service life of cubic hinge press synthesis device and auxiliary accessories thereof, improve graphite post internal density and can reduce synthetic required pressure effectively, can remedy graphite post discontinuity phenomenon (or interior empty phenomenon) under the high pressure high temperature, stablize the growth of diamond environment, improve diamond output and quality, make expansion superhard material synthetic cavity no longer become a difficult problem again, have promotion prospect preferably.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

The specific embodiment

The synthetic piece of raising internal density as shown in Figure 1, it comprises graphite post 5, conducting steel ring 2 and pyrophyllite and dolomite complex media 1, graphite post 5 is formed by graphite and the compacting of catalyst powder, conducting steel ring 2 is arranged on the two ends of graphite post 5, and pyrophyllite and dolomite complex media 1 are arranged on the periphery of graphite post 5 and conducting steel ring 2.Graphite post 5 cores are provided with cavity 8, tight fit is provided with filling block 6 in cavity 8, and the density of filling block 6 is higher than the density of graphite post 5, can make graphite post 5 obtain sufficient synthesis pressure, stressed evenly, can subdue graphite post 5 interior void, improve the quality product ratio.For improving heat transfer efficiency, between the wall of filling block 6 and cavity 8, be provided with interior heating element heater, interior heating element heater comprises the heating tube 7 at filling block 6 outer peripheral face places and the heating plate 71 at filling block 6 upper and lower end face places, and heating tube 7 is trapped among filling block 6 outsides with heating plate 71 sealed packets.Because the volume of cavity 8 is too small, graphite post 5 stressed even situations are poor, and the volume of cavity 8 is excessive, can reduce adamantine output greatly.In order to guarantee the graphite post 5 stressed all even diamond output of guaranteeing, the volume of cavity 8 is the 10%-50% of graphite post 5 volumes, and promptly filling block 6 is the 10%-50% of graphite post 5 volumes with the cumulative volume of interior heating element heater.Heating element heater outside between conducting steel ring 2 and graphite post 5 both ends of the surface, between pyrophyllite and dolomite complex media 1 and graphite post 5 outer peripheral faces, being equipped with, outer heating element heater comprises the heating tube 3 at graphite post 5 outer peripheral face places and the heating plate 31 of graphite post 5 two end faces, and heating tube 3 is trapped among graphite post 5 outsides with heating plate 31 sealed packets.Be provided with insulation component 4 between the heating tube 3 of outer heating element heater and heating plate 31 and graphite post 5 outer surfaces.Interior heating element heater and outer heating element heater are inner and outside simultaneously to 5 heat conduction of graphite post from graphite post 5 respectively, like this can be balanced, stablize the interior temperature field of synthetic cavity, to the stable growing environment of diamond creation, thereby improve adamantine output and quality.

In the present embodiment, guaranteeing that filling block 6 density are higher than under the prerequisite of graphite post 5 density, filling block 6 can be selected materials such as unit plain sheet, multicomponent alloy or complex media for use.Because the density of unit plain sheet (every cubic centimetre of 7.86 gram) is more than 2 times of graphite post 5 compact densities (every cubic centimetre of 2-3 gram), its density size is comparatively suitable, so the material preferred cell plain sheet of filling block 6.The volume of cavity 8 is preferably 20% of graphite post 5 volumes.Heating tube 3 can be graphite tape or graphite-pipe with the material of heating tube 7, and heating plate 31 can be a graphite flake with the material of heating plate 71.

Heating tube 7 with the effect of heating plate 71 is: because graphite post 5 is made by graphite and catalyst powder, graphite powder mainly is to be converted into diamond, and catalyst powder (perhaps metal powder) mainly has been catalytic action, is converted into diamond to impel graphite powder; If filling block 6 directly contacts with graphite post 5, just can play the effect of catalyst powder, participate in catalysis, thereby reduce the effect of filling block 6 counterpressures; And heating tube 7 can be kept apart filling block 6 and graphite post 5 with the intervention of heating plate 71, only plays to the effect of graphite post 5 for carbon and heat conduction.

In the compression moulding process of graphite post 5, with graphite post 5 hollow body that to be pressed into a centre be cavity 8, the tight fit filling block 6 of a density of packing in the cavity 8 of graphite post 5 greater than graphite post 5 density, for ease of assembling, big two halves such as graphite post 5 can be made, two schungite posts 5 fasten the cavity 8 that surrounds the middle part; Graphite post 5 is under superhigh-temperature and-pressure during diamond synthesis, not only be subjected to six top hammers from outside applied pressure, inner simultaneously filling block 6 is also in a disguised form exerted pressure to graphite post 5, graphite post 5 each orientation all are subjected to inside and outside bidirection press effect, this effect not only can reduce by six top hammer applied forces, thereby prolongs the service life of cubic hinge press synthesis device; And can make graphite post 5 each orientation stressed evenly, the interior empty situation of having subdued graphite post 5 has improved the ratio of quality product.

Claims

1. synthetic piece that improves internal density, comprise the conducting steel ring at graphite post, graphite post two ends and the pyrophyllite and the dolomite complex media of graphite post and conducting steel ring periphery, it is characterized in that: described graphite post core is provided with cavity, tight fit is provided with filling block in the cavity, and filling block density is higher than the graphite column density.

2. the synthetic piece of raising internal density as claimed in claim 1 is characterized in that: be provided with interior heating element heater between described filling block and the cavity wall.

3. the synthetic piece of raising internal density as claimed in claim 1 is characterized in that: the volume of described cavity is the 10%-50% of graphite column volume.

4. as the synthetic piece of claim 1 or 2 or 3 described raising internal densities, it is characterized in that: between described conducting steel ring and the graphite post both ends of the surface, be equipped with outer heating element heater between pyrophyllite and dolomite complex media and the graphite post outer peripheral face.

5. the synthetic piece of raising internal density as claimed in claim 4 is characterized in that: be provided with insulation component between described outer heating element heater and the graphite outer surface of column.