CN-122010577-A - Silicon nitride-based composite ceramic material and preparation method thereof

Abstract

The invention belongs to the technical field of engineering ceramic composite materials, and discloses a silicon nitride-based composite ceramic material and a preparation method thereof, wherein the method comprises the following steps of crushing wood, sieving to obtain wood powder; weighing wood powder with the mass fraction of 2% -5%, yttrium oxide powder with the mass fraction of 4% -6% and aluminum oxide powder with the mass fraction of 4% -6% and silicon nitride powder with the mass fraction of 85% -88%, uniformly mixing all the powder by a wet grinding method, drying for 3-10 hours at the temperature of 60-100 ℃, screening to obtain composite powder, carrying out secondary mixing on the composite powder, uniformly mixing the composite powder after secondary mixing, loading the composite powder into a mould for prepressing, and sintering the pre-pressed composite powder at the temperature of 1700 ℃ to obtain the silicon nitride-based composite ceramic material. According to the invention, wood powder is used as one of the raw materials, leftover materials of wood processing can be fully utilized, and the mechanical properties of the prepared silicon nitride-based composite ceramic material are improved.

Inventors

• ZHAO WENZHUO
• CHEN WEI
• ZHOU AO
• LI YETONG
• WANG CHAO
• WANG TAOKAI
• XU YANGBO
• WANG YUANYUAN
• Pang Shaobing

Assignees

• 陕西科技大学

Dates

Publication Date

20260512

Application Date

20260211

Claims (10)

1. 1. The preparation method of the silicon nitride-based composite ceramic material is characterized by comprising the following steps of: Crushing and sieving wood to obtain wood powder; Weighing 2% -5% of wood powder, 4% -6% of yttrium oxide powder and 4% -6% of aluminum oxide powder, and 85% -88% of silicon nitride powder; uniformly mixing all the powder by a wet grinding method, drying for 3-10 hours at 60-100 ℃, screening to obtain composite powder, and carrying out secondary mixing on the composite powder; Uniformly mixing the composite powder after secondary mixing, and loading the mixture into a mold for prepressing; And sintering the pre-pressed composite powder in the environment of 1700 ℃ to obtain the silicon nitride-based composite ceramic material.
2. 2. The method for producing a silicon nitride-based composite ceramic material according to claim 1, wherein the wood powder is obtained by pulverizing the wood powder by a high-speed pulverizer and filtering the pulverized wood powder by a screen.
3. 3. The method for producing a silicon nitride-based composite ceramic material according to claim 1, wherein the total mass fraction of the yttrium oxide powder and the aluminum oxide powder is 10%.
4. 4. The method for preparing a silicon nitride-based composite ceramic material according to claim 1, wherein the composite powder is sieved to obtain the composite powder with uniform particles before pre-pressing.
5. 5. The method for producing a silicon nitride-based composite ceramic material according to claim 1, wherein the composite powder is pre-pressed by a static pressure die.
6. 6. The method for producing a silicon nitride-based composite ceramic material according to claim 1, wherein all the powders uniformly mixed are wet-milled by a ball mill before the drying step.
7. 7. The method for producing a silicon nitride-based composite ceramic material according to claim 6, wherein absolute ethyl alcohol is used as a grinding medium in wet grinding.
8. 8. The method for preparing a silicon nitride-based composite ceramic material according to claim 1, wherein after the composite powder material is obtained through the drying step, sieving is performed, and then a three-dimensional vibration mixer is used for secondary mixing of the composite powder material, and a pre-pressing step is performed.
9. 9. The method for producing a silicon nitride-based composite ceramic material according to claim 1, wherein in the pre-pressing step, the composite powder is put into a mold of a sintering furnace for pre-pressing, and then the mold of the sintering furnace is put into the sintering furnace for sintering under the protection of nitrogen.
10. 10. A silicon nitride-based composite ceramic material, characterized in that it is prepared by a method for preparing a silicon nitride-based composite ceramic material according to any one of claims 1 to 9.

Description

Silicon nitride-based composite ceramic material and preparation method thereof Technical Field The invention belongs to the technical field of engineering ceramic composite materials, and particularly relates to a silicon nitride-based composite ceramic material and a preparation method thereof. Background Ceramic materials are a class of inorganic nonmetallic materials made from natural or synthetic compounds by forming and high temperature sintering. And as advanced structural ceramic-silicon nitride (Si 3N 4) has excellent mechanical, chemical and physical properties, and is widely applied to the fields of engine parts, cutting tools, aerospace, machining, electronic information and the like. Chinese patent publication No. CN108675797A, patent application entitled silicon nitride based composite ceramic material and microwave sintering preparation method thereof, the silicon nitride based composite ceramic material comprises the following components in percentage by weight68-75% Of Si3N4, 3 3% of Y2O 33, 3-5% of MgO, 3 2-4% of Al2O, 15-20% of (W, ti) C and 1-4% of Ni. The patent application adopts silicon carbide chip auxiliary heating to replace the traditional powder-buried auxiliary sintering, but does not fully utilize environment-friendly materials. Disclosure of Invention In order to overcome the problems in the prior art, the invention aims to provide the silicon nitride-based composite ceramic material and the preparation method, wherein wood powder is used as one of raw materials, leftover materials of wood processing can be fully utilized, material cost can be reduced, waste materials can be fully utilized, the preparation process of the method is simple, the preparation period is short, and the mechanical property of the prepared silicon nitride-based composite ceramic material is improved. In order to achieve the above purpose, the invention adopts the following technical scheme: in a first aspect, the present invention provides a method for preparing a silicon nitride-based composite ceramic material, comprising the steps of: Crushing and sieving wood to obtain wood powder; Weighing 2% -5% of wood powder, 4% -6% of yttrium oxide powder and 4% -6% of aluminum oxide powder, and 85% -88% of silicon nitride powder; uniformly mixing all the powder by a wet grinding method, drying for 3-10 hours at 60-100 ℃, screening to obtain composite powder, and carrying out secondary mixing on the composite powder; Uniformly mixing the composite powder after secondary mixing, and loading the mixture into a mold for prepressing; And sintering the pre-pressed composite powder in the environment of 1700 ℃ to obtain the silicon nitride-based composite ceramic material. Optionally, the wood flour powder is crushed by a high-speed crusher and filtered by a screen. Optionally, the total mass fraction of the yttria powder and the alumina powder is 10%. Optionally, before pre-pressing, the composite powder is screened to obtain the composite powder with uniform particles. Optionally, the composite powder is pre-pressed using a static pressure die. Optionally, all the powders that are uniformly mixed are wet milled using a ball mill before the drying step. Alternatively, absolute ethanol is used as the grinding medium in wet grinding. Optionally, after the composite powder subjected to the drying step is obtained, screening is carried out, then a three-dimensional vibration mixer is used for carrying out secondary mixing on the composite powder, and then a pre-pressing step is carried out. Optionally, in the pre-pressing step, the composite powder is put into a mold of a sintering furnace for pre-pressing, and then the mold of the sintering furnace is put into the sintering furnace for sintering under the protection of nitrogen. In a second aspect, the present invention provides a silicon nitride-based composite ceramic material, which is prepared by using the preparation method of the silicon nitride-based composite ceramic material. Compared with the prior art, the invention has the following beneficial effects: According to the preparation method of the silicon nitride-based composite ceramic material, the processed wood powder and the silicon nitride powder are mixed and subjected to hot-pressing sintering to prepare the silicon nitride-based composite ceramic material. The silicon nitride can be applied to the fields of aerospace, energy, precision manufacturing, metallurgical chemical industry, biomedical and consumption by virtue of high strength, high temperature resistance, corrosion resistance, low density and excellent thermodynamic property. The wood powder is used as leftover materials in the wood processing step, and is processed by mechanical crushing and grinding processes to obtain powdery substances. From the chemical component analysis, the main components are cellulose, hemicellulose and lignin. In view of the source universality, the method covers the waste generated in various wood processing sce