CN201230381Y

CN201230381Y - Heating body for super hard material synthesizing

Info

Publication number: CN201230381Y
Application number: CNU2008200709075U
Authority: CN
Inventors: 张相法; 梁浩
Original assignee: ZHENGZHOU ZHONGNAN JETE SUPERABRASIVES CO Ltd
Current assignee: ZHENGZHOU ZHONGNAN JETE SUPERABRASIVES CO Ltd
Priority date: 2008-06-06
Filing date: 2008-06-06
Publication date: 2009-04-29
Anticipated expiration: 2018-06-06

Abstract

The utility model relates to a heating unit used for the synthesis of super-hard materials with diamond and elbor; the heating unit is combined with an A section of heating pipe, a B section of heating pipe and a C section of heating pipe with different resistivity, wherein, the resistivity of the A section of heating pipe in the middle is low, and the resistivity of the B section of the heating pipe is high. The heating unit can balance a temperature filed, effectively avoid burning and improve the yield and quality of diamond and elbor synthesis.

Description

The synthetic calandria of using of a kind of superhard material

Technical field

The utility model belongs to the synthetic facility technology field of material, especially for diamond and the synthetic synthetic calandria of using of a kind of superhard material of cubic boron nitride.

Background technology

At present, the synthetic high pressure high temperature method that adopts usually of superhard material diamond and cubic boron nitride, promptly when utilizing special high-pressure equipment to apply superhigh pressure, apply 1300 ℃～1800 ℃ high temperature, in the prior art, the heat body that is adopted is with graphite turning pipe or graphite powder compacting pipe, under the low-voltage and high-current effect, generate heat, because heating tube resistivity homogeneous, heating evenly, but in reality is synthetic,, cause synthetic stock column waist temperature drift because of the difference of each preserving heat and radiating heat effect of synthetic cavity, cause " burning waist " phenomenon of being commonly called as, avoid " burning waist " then can cause the two ends temperature on the low side again if reduce electric current, make synthesis material column temperature distribution gradient big, influence the yield and quality of superhard material sintetics.

The utility model content

The utility model purpose provides a kind of can avoiding " burning waist ", makes the synthetic cavity temperature field even, and can improve the synthetic calandria of using of superhard material of diamond and cubic boron nitride output and quality quality.

Realize that the technical scheme that the purpose of this utility model is taked is: this calandria is that the heating tube by A, B, three sections different resistivity of A combines, and wherein, the A section is the high heating tube of resistivity, and middle B section is the low heating tube of resistivity.

Described A section heating tube adopts and adds 5% hexagonal boron nitride powder homogenious charge compression system in the natural graphite powder by weight and form, and B section heating tube adopts and adds 1.5% hexagonal boron nitride powder homogenious charge compression system in the natural graphite powder by weight and form.

The height of described A, two kinds of heating tubes of B is identical.

The superhard material of making according to such scheme is synthetic use calandria, can play the effect of equilibrium temperature field, effectively avoids " burning waist " phenomenon to take place, and reaches to improve the purpose that diamond and cubic boron nitride synthesize yield and quality.

Description of drawings

Fig. 1 is the utility model structural representation.

Embodiment

Referring to Fig. 1, the synthetic calandria of using of superhard material of the present utility model, form for three sections by A, B, A, wherein the A section is to add 5% hexagonal boron nitride powder homogenious charge compression by weight to make tubulose in natural graphite powder, the B section is made tubulose by the hexagonal boron nitride powder homogenious charge compression that adds 1.5% in the natural graphite powder by weight, makes the resistivity of A section be higher than the resistivity of B section thus.The height of A, two kinds of heating tubes of B is identical, and becomes a complete calandria by the permutation and combination method closed assembly of ABA.In the process of heating sintetics, utilize the A section pipe and the different rate of heat addition of middle B section at two ends, and, reach whole and heat up synchronously by its inner conduction of heat of synthesizing stock column, to obtain balanced temperature field, avoid the generation of " burning waist " phenomenon effectively.As: adopt ￠ 40 cavity synthesizing cubic boron nitrides commonly used at present, A, B section highly are respectively 12mm, are assembled into the high calandria of 36mm by ABA, and average single output can improve 2 carats, and can make the quality of synthesizing cubic boron nitride obtain the consistency raising.

Claims

1, a kind of superhard material is synthetic uses calandria, it is characterized in that: it is that heating tube by A, B, three sections different resistivity of A combines, and wherein, the A section is the high heating tube of resistivity, and middle B section is the low heating tube of resistivity.

2, superhard material according to claim 1 is synthetic uses calandria, and it is characterized in that: the height of described A, two kinds of heating tubes of B is identical.