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Preparing method of Si-B-C-N ceramic with laminated BN(C) grains toughened

A lamellar and grain-like technology, applied in the field of Si-B-C-N ceramic preparation, to achieve the effect of reducing the possibility

Inactive Publication Date: 2017-03-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lamellar or plate-like grains can effectively improve the brittleness of ceramics, but there are no articles or patents reporting the preparation method of in-situ grown lamellar grain-toughened silicon-boron-carbon-nitride ceramics

Method used

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  • Preparing method of Si-B-C-N ceramic with laminated BN(C) grains toughened
  • Preparing method of Si-B-C-N ceramic with laminated BN(C) grains toughened
  • Preparing method of Si-B-C-N ceramic with laminated BN(C) grains toughened

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Embodiment 1

[0020] The preparation method of a kind of lamellar BN (C) grain toughened Si-B-C-N ceramics involved in this embodiment is specifically carried out according to the following steps: 1. According to Si:B:C:N molar ratio is 2:1 : Weigh cubic silicon powder, hexagonal boron nitride powder and graphite powder in a ratio of 3:1; then weigh 8wt% of the total weight of raw materials LaB 6 Powder; the purity of cubic silicon powder is 99%-99.9%, and the particle size is 1-20μm; the purity of graphite powder is 99%-99.9%, and the particle size is 1-20μm; the purity of hexagonal boron nitride is 99%-99.9% , the particle size is 1-20 μm; the purity of lanthanum hexaboride is 99%-99.9%, and the particle size is 10-50 μm; 2. Put the weighed raw materials into a ball mill jar, and carry out high-energy ball milling under the protection of an argon atmosphere. Available with LaB 6 The Si-B-C-N ceramic composite powder; wherein the mass ratio of the ball to material is 30:1, the diameter of...

Embodiment 2

[0024] The preparation method of a kind of lamellar BN (C) grain toughened Si-B-C-N ceramics involved in this embodiment is specifically carried out according to the following steps: 1. According to Si:B:C:N molar ratio is 2:1 : Take by weighing cubic silicon powder, hexagonal boron nitride powder and graphite powder in a ratio of 3:1; then take by weighing 12wt% of the total weight of raw materials used LaB 6 Powder; the purity of cubic silicon powder is 99%-99.9%, and the particle size is 1-20μm; the purity of graphite powder is 99%-99.9%, and the particle size is 1-20μm; the purity of hexagonal boron nitride powder is 99%-99.9 %, the particle size is 1-20 μm; the purity of lanthanum hexaboride is 99%-99.9%, and the particle size is 10-50 μm; 2. Put all the raw materials weighed into the ball mill tank, and carry out high-energy grinding under the protection of argon atmosphere. LaB can be obtained by ball milling 6 Si-B-C-N ceramic powder; wherein the mass ratio of the bal...

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Abstract

The invention provides a preparing method of Si-B-C-N ceramic with laminated BN(C) grains toughened and belongs to the technical field of preparing methods of Si-B-C-N ceramic. The method comprises the steps that 1, cubic silica powder, hexagonal boron nitride powder, graphite powder and lanthanum hexaboride powder are weighed according to the molar ratio and the mass ratio to be served as raw materials for standby application; 2, the raw materials weighed in the step 1 are put into a ball-milling tank, and high-energy ball milling is carried out under the protection of argon atmosphere, so that Si-B-C-N ceramic composite powder containing LaB6 is obtained; the ball material mass ratio is (10-90):1, the ball-milling diameter is 5-9 mm, and ball-milling time is 10-60 h; and 3, the ceramic composite powder obtained in the step 2 is subjected to spark plasma sintering to obtain a Si-B-C-N ceramic material with the laminated BN(C) grains toughened. The Si-B-C-N ceramic material obtained through the preparing method has high breaking tenacity, and the possibility of catastrophic fracture of the ceramic is reduced. The added rare earth compound LaB6 contributes to in-situ growth of the laminated BN(C) grains.

Description

technical field [0001] The invention relates to a preparation method of Si-B-C-N ceramics toughened by laminar BN (C) grains, and belongs to the technical field of preparation methods of Si-B-C-N ceramics. Background technique [0002] Silicon boron carbon nitrogen (Si-B-C-N) ceramic material has the characteristics of low density, high strength, low modulus, good oxidation resistance, good creep resistance, and low thermal expansion coefficient. It has become a new type of high-temperature structural material. Cones, wing leading edges, rudder surfaces, covers, and engine nozzles have great application potential. However, their inherent brittleness severely limits large-scale industrial applications. In order to improve the fracture toughness of silicon boron carbon nitrogen ceramics, particles (such as Al, ZrO 2 etc.), short fibers (such as carbon fibers, silicon carbide fibers, etc.) and other "second phases" have been introduced into the silicon boron carbon nitride ce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/515C04B35/80C04B35/64C04B35/622
CPCC04B35/515C04B35/622C04B35/64C04B35/806C04B2235/3804C04B2235/386C04B2235/425C04B2235/428C04B2235/666C04B2235/96
Inventor 贾德昌梁斌杨治华王胜金何培刚段小明周玉
Owner HARBIN INST OF TECH
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