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High-density boron carbide composite material and preparation method thereof

A technology of composite materials and boron carbide, which is applied in the field of high-density boron carbide composite materials and its preparation, can solve the problems of boron carbide density reduction, reduced performance, and large resistance to grain boundary movement, so as to save resources and energy , saving production cost, short sintering time

Inactive Publication Date: 2014-03-12
NINGBO DONGLIAN MECHANICAL SEAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Boron carbide is an important engineering material. Its hardness is second only to diamond. Therefore, it is widely used in the fields of machinery, metallurgy, aerospace, chemical industry, military industry and nuclear industry. Due to the high covalent bond content of boron carbide, Its plasticity is poor, the movement resistance of the grain boundary is large, the solid surface tension is small, and the activation energy of sintering is low, which makes boron carbide difficult to sinter; in general, hot pressing sintering needs to be sintered at 2200°C for 8-10h. The sintering temperature is high, the duration is long, and a lot of energy is wasted. At the same time, the hot-press sintering makes the grains of boron carbide larger, and the crystals formed by the larger grains have more voids, which leads to a great decrease in the overall density of boron carbide. reduce its overall performance

Method used

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  • High-density boron carbide composite material and preparation method thereof

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Embodiment 1

[0019] Embodiment 1: a kind of high-density boron carbide composite material, the weight percentage of each described component is as follows: 75% boron carbide, 10% Al 4 C 3 and Al 2 o 3 A mixture of 3% phenolic resin, 3% graphite, 3% TiO 2 , 6% Fe and Cu. Concrete preparation method is as follows:

[0020] 1) Weigh the boron carbide powder with the corresponding weight ratio, put it into the stirring pulverizer for pulverization and stirring, after stirring for 30 minutes, add 10% Al in turn 4 C 3 and Al 2 o 3 A mixture of powder and 3% TiO 2 Crystal powder, fully stirred and mixed for 5 hours, the solid powder after stirring and mixing was filtered through a sieve with a pore size of 1-3 μm, and weighed for later use;

[0021] 2) Add deionized water to the filtered solid powder, stir, mix and dilute to form a slurry, add the above solid-liquid mixed slurry into a ball mill, and ball mill for 8 hours at room temperature;

[0022] 3) The solid slurry after ball mill...

Embodiment 2

[0026] Embodiment 2: a kind of high-density boron carbide composite material, the weight percent of each described component is as follows: 88% boron carbide, 6% Al 4 C 3 and Al 2 o 3 A mixture of 1% phenolic resin, 2% graphite, 1% TiO 2 , 2% Si. Concrete preparation method is as follows:

[0027] 1) Weigh the boron carbide powder with the corresponding weight ratio, put it into the stirring pulverizer for crushing and stirring, after stirring for 30 minutes, add 6% Al in turn 4 C 3 and Al 2 o 3 A mixture of powder and 1% TiO 2 Crystal powder, fully stirred and mixed for 5 hours, the solid powder after stirring and mixing was filtered through a sieve with a pore size of 1-3 μm, and weighed for later use;

[0028] 2) Add deionized water to the filtered solid powder, stir, mix and dilute to form a slurry, add the above solid-liquid mixed slurry into a ball mill, and ball mill for 10 hours at room temperature;

[0029] 3) The solid slurry after ball milling is added to ...

Embodiment 3

[0033] Embodiment 3: a kind of high-density boron carbide composite material, the weight percentage of each described component is as follows: 82% boron carbide, 8% Al 4 C 3 and Al 2 o 3 A mixture of 2% phenolic resin, 2% graphite, 1% TiO 2 , 5% Mg and Fe. Concrete preparation method is as follows:

[0034] 1) Weigh the boron carbide powder with the corresponding weight ratio, put it into the stirring pulverizer for pulverization and stirring, after stirring for 30 minutes, add 8% Al in turn 4 C 3 and Al 2 o 3 A mixture of powder and 1% TiO 2 Crystal powder, fully stirred and mixed for 5 hours, the solid powder after stirring and mixing was filtered through a sieve with a pore size of 1-3 μm, and weighed for later use;

[0035] 2) Add deionized water to the filtered solid powder, stir, mix and dilute to form a slurry, add the above solid-liquid mixed slurry into a ball mill, and ball mill for 8 hours at room temperature;

[0036] 3) The solid slurry after ball millin...

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Abstract

The invention discloses a high-density boron carbide composite material, which comprises the following components in percentage by weight: 75 percent to 88 percent of boron carbide, 6 percent to 10 percent of mixture of Al4C3 and Al3O3, 1 percent to 3 percent of phenolic resin, 2 percent to 5 percent of graphite, 1 percent to 3 percent of TiO2 and 2 percent to 6 percent of solid simple substance. The high-density boron carbide composite material is obtained by using boron carbide as the raw material and sequentially executing the steps of grinding and mixing, carrying out ball-milling, carrying out spray granulation, carrying out pressure forming and carrying out multi-section temperature-controlled sintering. According to the invention, by different raw material proportions and the operation step of sectionally sintering, the sintering work of all the raw materials and boron carbide crystals is completed step by step; the density of the product is improved; the crystal density of boron carbide reaches 99.0 percent; meanwhile, sintering time is relatively short; resources and energy of the whole engineering are saved; production cost is saved.

Description

technical field [0001] The invention relates to the field of preparation of boron carbide ceramic materials, in particular to a high-density boron carbide composite material and a preparation method thereof. Background technique [0002] Density refers to the volume percentage of atoms in the unit cell itself, that is, the ratio of the volume of atoms contained in the unit cell to the volume of the unit cell. Generally, atoms are regarded as rigid spheres, and then the relationship between the number of atoms in a unit cell, the atomic radius and the lattice constant can be calculated to calculate the density. The density of the crystal can directly affect the physical properties of the crystal. . [0003] Boron carbide is an important engineering material. Its hardness is second only to diamond. Therefore, it is widely used in the fields of machinery, metallurgy, aerospace, chemical industry, military industry and nuclear industry. Due to the high covalent bond content of ...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C29/02
Inventor 李友宝励永平崔贵胜
Owner NINGBO DONGLIAN MECHANICAL SEAL
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