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Composite pressure transmission medium for non-pressurized ball-type ultra-high pressure device and its preparation method

A pressure-transmitting medium and ball-dividing technology, which is applied in the field of materials and artificial diamond preparation, can solve the problems of large porosity, difficulty in meeting requirements, poor thermal insulation performance of pyrophyllite, etc., and achieve improved thermal insulation properties and low porosity. Effect

Active Publication Date: 2020-12-18
王国伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] It can be seen that the pressure transmission medium in the prior art is difficult to meet the requirements of BARS because of its large porosity, and pyrophyllite is also difficult to meet the requirements due to its poor thermal insulation performance.

Method used

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  • Composite pressure transmission medium for non-pressurized ball-type ultra-high pressure device and its preparation method
  • Composite pressure transmission medium for non-pressurized ball-type ultra-high pressure device and its preparation method
  • Composite pressure transmission medium for non-pressurized ball-type ultra-high pressure device and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Stabilize ZrO with 3% mol yttrium 2 As a raw material, ZrO was prepared by the above process 2 Ball powder. ZrO with a total mass of 1000 g 2 Spheroidized powder and ZrO with a median particle size of 5 μm 2 The raw material powder is uniformly mixed on the three-dimensional mixer according to the mass ratio of 60:40. Among them, ZrO with different particle sizes 2 The weighing quality of spheroidizing powder is as shown in table 1:

[0038] Table 1 ZrO with different particle sizes 2 Weigh the mass of spheroidized powder

[0039] Particle size (micron) 100-80 80-60 60-40 40-20 total Mass percentage (%) 5％ 35％ 45％ 15％ 100％ Weighing mass (g) 30 210 270 90 600

[0040] Mix the above ZrO 2 The powder is added with 5% mass ratio and 5% PVA solution, and is granulated with a spray granulator.

[0041] The granulated powder is filled into the mold and pressed into shape.

[0042] Sinter the pressed blank into a high-temperatur...

Embodiment 2

[0046] Stabilize ZrO with 8 mol% yttrium 2 As a raw material, ZrO was prepared by the above process 2 Ball powder. ZrO with a total mass of 1000 g 2 Spheroidized powder and ZrO with a median particle size of 5 μm 2 The raw material powder is uniformly mixed on the three-dimensional mixer according to the mass ratio of 60:40. Among them, ZrO with different particle sizes 2 The weighing quality of spheroidizing powder is as shown in table 2:

[0047] Table 2 ZrO with different particle sizes 2 Weigh the mass of spheroidized powder

[0048] Particle size (micron) 100-80 80-60 60-40 40-20 total Mass percentage (%) 5％ 35％ 45％ 15％ 100％ Weighing mass (g) 30 210 270 90 600

[0049] Mix the above ZrO 2 The powder is added with 5% mass ratio and 5% PVA solution, and is granulated with a spray granulator.

[0050] Fill the granulated powder into the mold and press to form.

[0051] Sinter the pressed blank into a high-temperature muffle f...

Embodiment 3

[0055] Stabilize ZrO with 8 mol% yttrium 2 As a raw material, ZrO was prepared by the above process 2 Ball powder. ZrO with a total mass of 1000 g 2 Spheroidized powder and ZrO with a median particle size of 5 μm 2 The raw material powder is evenly mixed on the three-dimensional mixer according to the mass ratio of 65:35. Among them, ZrO with different particle sizes 2 The weighing quality of spheroidizing powder is as shown in table 3:

[0056] Table 3 ZrO with different particle sizes 2 Weigh the mass of spheroidized powder

[0057] Particle size (micron) 100-80 80-60 60-40 40-20 total Mass percentage (%) 5％ 30％ 40％ 25％ 100％ Weighing mass (g) 32.5 195 260 162.5 650

[0058] Mix the above ZrO 2 The powder is added with 5% mass ratio and 5% PVA solution, and is granulated with a spray granulator.

[0059] Fill the granulated powder into the mold and press to form.

[0060] Sinter the pressed blank into a high-temperature muffle...

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Abstract

The invention relates to a compound pressure-transmitting medium for a pressless split-sphere type ultra-high pressure device (BARS) and a preparation method thereof. The method comprises the following steps: selecting a 3 mol% or 8 mol% yttrium-stabilized ZrO2 powder; and spheroidizing the raw material powder, and sieving into powders with four particle size levels of 100-80 [mu]m, 80-60 [mu]m, 60-40 [mu]m and 40-20 [mu]m; then mixing the powders and molding; and next, sintering and molding in a sintering furnace: machining to the appropriate size, then carrying out salt bath, and controllingthe salt bath temperature and time to reduce the total porosity of the cube to 5-10%. 1. The porosity of the pressure-transmitting medium prepared by the method is 5-10%, the effects of low porosity,high pressure-transmitting efficiency and good thermal insulation characteristic can be achieved, and the precision requirements of the BARS is met.

Description

technical field [0001] The invention relates to the field of materials, in particular to the technical field of artificial diamond preparation. Background technique [0002] The pressless ball-type ultra-high pressure device (BARS) can generate up to 10GPa ( Atmospheric pressure) synthesis pressure, widely used in ultra-high pressure research and industrial synthesis, especially the synthesis of synthetic diamond single crystal. BARS equipment has a two-stage anvil structure in the form of "8+6", such as figure 1 As shown, it includes a high-pressure container 1, a hydraulic shaft 2, a rubber bowl 3, a first-level 8-equalized spherical anvil 4, a second-level 6-equalized cubic-octahedral tungsten carbide anvil 5, and a pressure-transmitting medium cube 6, one of which The graded ball anvil 4 is composed of high-strength alloy steel with a nominal diameter of 300 mm, and the distance between the side surfaces of the ball anvil is 4 mm; the secondary tungsten carbide anvil ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/48C04B41/85C04B35/622
CPCC04B35/48C04B35/622C04B41/5012C04B41/85
Inventor 曹大呼龙政鑫李培培
Owner 王国伟
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