Preparation method of density-controllable B10-rich boron carbide ceramic

A technology of boron carbide ceramics and boron carbide, applied in the field of preparation of density-controllable B10-rich boron carbide ceramics, can solve the problems of increased manufacturing costs, processing difficulties, waste of raw materials, etc., to reduce processing and production costs, facilitate industrial production, The effect of improving the pass rate

Active Publication Date: 2019-11-22
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, boron carbide has a high covalent bond content and is extremely difficult to sinter. At present, the density and size control of pressureless sintered boron carbide ceramics is not precise, resulting in a low qualified rate of boron carbide ceramics. The waste of raw materials increases the manufacturing cost

Method used

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  • Preparation method of density-controllable B10-rich boron carbide ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Design a kind of D=23.5mm, the columnar abundance of H=25mm is 92 rich B10 boron carbide ceramics, the design density is Including the following steps:

[0020] 1) Dry B10-rich boron carbide ceramic powder with an abundance of 92 and a particle size of 3-5 μm in a vacuum oven at 80°C-110°C for 8-24h;

[0021] 2) Weigh the dried B10-rich boron carbide ceramic powder and put the B10-rich boron carbide ceramic powder into a special high-strength, high-density graphite mold. The design is divided into two parts, the end cover is designed to have grooves, and a layer of graphite paper with a thickness of 0.1-0.5mm is pasted on the contact part between the graphite mold and the B10-rich boron carbide powder;

[0022] 3) Put the graphite mold filled with B10-rich boron carbide ceramic powder in step 2) into a hydraulic press for holding pressure for 3-10 minutes, with a holding pressure of 3-5 tons;

[0023] 4) Put the graphite mold maintained under pressure in step 3) in...

Embodiment 2

[0026] Design a D=23.5mm, H=25mm columnar abundance of 80 rich B10 boron carbide ceramics, the design density is Including the following steps:

[0027] 1) Dry B10-rich boron carbide ceramic powder with abundance 80 and particle size 0.5-2 μm in a vacuum oven at 80°C-110°C for 8-24h;

[0028] 2) Weigh the dried B10-rich boron carbide ceramic powder and put the B10-rich boron carbide ceramic powder into a special high-strength, high-density graphite mold. The design is divided into two parts, the end cover is designed to have grooves, and a layer of graphite paper with a thickness of 0.1-0.5mm is pasted on the contact part between the graphite mold and the B10-rich boron carbide powder;

[0029] 3) Put the graphite mold filled with B10-rich boron carbide ceramic powder in step 2) into a hydraulic press for holding pressure for 3-10 minutes, with a holding pressure of 3-5 tons;

[0030] 4) Put the graphite mold maintained under pressure in step 3) into a hot-press furnace f...

Embodiment 3

[0033] Design a kind of D inner diameter=74mm, D outer diameter=88mm, H=20mm annular abundance is the rich B10 boron carbide ceramics of 85, the design density is Including the following steps:

[0034] 1) Dry B10-rich boron carbide ceramic powder with abundance 85 and particle size 0.7-2 μm in a vacuum oven at 80°C-110°C for 8-24h;

[0035] 2) Weigh the dried B10-rich boron carbide ceramic powder and put the B10-rich boron carbide ceramic powder into a special high-strength, high-density graphite mold. The design is divided into two parts, the end cover is designed to have grooves, and a layer of graphite paper with a thickness of 0.1-0.5mm is pasted on the contact part between the graphite mold and the B10-rich boron carbide powder;

[0036] 3) Put the graphite mold filled with B10-rich boron carbide ceramic powder in step 2) into a hydraulic press for holding pressure for 3-10 minutes, with a holding pressure of 3-5 tons;

[0037] 4) Put the graphite mold maintained unde...

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Abstract

The invention discloses a preparation method of density-controllable B10-rich boron carbide ceramic. The preparation method comprises the following steps: 1) drying B10-rich boron carbide powder; 2) weighing a certain amount of dried B10-rich boron carbide powder according to the designed density; 3) putting the weighed B10-rich boron carbide powder into a specially-made high-strength and high-density graphite mold cavity, heating the powder to 2100-2250 DEG C under a vacuum condition, and carrying out hot pressed sintering; and 4) performing pressurization after the pressure maintaining temperature is reached, wherien the pressure ranges from 10 MPa to 90 MPa and the heat preservation and pressure maintaining time ranges from 1 h to 2.5 h, and demolding the material after furnace coolingis conducted. The B10-rich boron carbide ceramic prepared by the preparation method disclosed by the invention solves the problem of low neutron absorption capacity; accurate control over the densityand the size of the boron carbide ceramic can be achieved through the hot-pressing mold by adopting the hot-pressing sintering process, the percent of pass of the boron carbide ceramic is increased, the machining and production cost is reduced, and the method is simple, effective and easy for industrial production.

Description

technical field [0001] The invention relates to the field of nuclear industry ceramic materials, in particular to a method for preparing density-controllable B10-rich boron carbide ceramics. Background technique [0002] Boron carbide has a high neutron absorption cross-section, wide energy spectrum absorption, low density, ultra-high hardness and good chemical stability. It is an important neutron absorbing material and is widely used in nuclear reactor core components, such as control rods And shielding materials, etc., as an important component of the reactor core, boron carbide ceramics should have high neutron absorption capacity in addition to precise density and size control. [0003] However, boron carbide has a high covalent bond content and is extremely difficult to sinter. At present, the density and size control of pressureless sintered boron carbide ceramics is not precise, resulting in a low qualified rate of boron carbide ceramics. Cause the waste of raw mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/622
CPCC04B35/563C04B35/622C04B2235/658C04B2235/6581C04B2235/77
Inventor 刘宗泉田陆
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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