Preparation process of silicon nitride ceramic material

Abstract

The invention discloses a preparation process of a silicon nitride ceramic material. The preparation process specifically comprises the following steps: S1, weighing raw materials: respectively weighing 40-50 parts of silicon nitride powder, 10-20 parts of a natural reinforced composite material, 10-20 parts of a nano composite material, 10-20 parts of modified titanium dioxide, 5-10 parts of a fiber reinforced material, 3-5 parts of barium carbonate powder and 50-60 parts of a solvent through batching equipment; the preparation method comprises the following steps of S1, grinding, S2, grinding and screening treatment, S3, ball-milling and die-pressing treatment and S4, calcining heat treatment. The invention relates to the technical field of ceramic preparation. According to the preparation process of the silicon nitride ceramic material, the strength, the wear resistance and the heat resistance of the silicon nitride ceramic material can be greatly improved by respectively adding the natural reinforced composite material, the nano composite material, the modified titanium dioxide and the fiber reinforced material into the ceramic material, and the preparation process of the silicon nitride ceramic material is greatly simplified; the purposes of improving the strength of the ceramic material and not increasing a large amount of production cost are well achieved, so that the silicon nitride ceramic material is greatly facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of ceramic preparation, and specifically to a preparation process of silicon nitride ceramic materials. Background Art

[0002] Ceramic materials are solid materials sintered from inorganic non-metallic materials at high temperature, with many unique physical and chemical properties such as high melting point, high hardness, high wear resistance, electrical insulation, and chemical stability. At the same time, they are non-toxic and harmless, being a green and environmentally friendly material, and are widely used in industries, electronics, medical, environmental protection and other fields. And with the development of technology, the application fields of ceramic materials are still expanding continuously. Silicon nitride ceramics are an important structural material. It is a super-hard substance, an inorganic material that does not shrink during sintering, has lubricity itself, and is wear-resistant; except for hydrofluoric acid, it does not react with other inorganic acids, has strong corrosion resistance, resists oxidation at high temperatures, and it can also resist thermal shock. When heated to above 1000 °C in air, cooled rapidly and then heated rapidly again, it will not break. It is precisely because silicon nitride ceramics have such excellent properties that people often use it to manufacture ceramic materials for the water seal of small gasoline engine water pumps. With the increasing use range of silicon nitride ceramic materials.

[0003] The existing preparation process of silicon nitride ceramic materials is complex, and the strength, wear resistance and heat resistance are poor. It cannot achieve greatly improving the strength, wear resistance and heat resistance of silicon nitride ceramic materials by separately adding natural reinforcing composites, nano-composites, modified titanium dioxide and fiber reinforcing materials to the ceramic materials, and cannot achieve the purpose of both improving the strength of the ceramic materials and not increasing a large amount of production costs, thus bringing great inconvenience to the preparation of silicon nitride ceramic materials. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] Aiming at the deficiencies of the prior art, the present invention provides a preparation process of silicon nitride ceramic materials, which solves the problems that the existing preparation process of silicon nitride ceramic materials is complex, and the strength, wear resistance and heat resistance are poor. It cannot achieve greatly improving the strength, wear resistance and heat resistance of silicon nitride ceramic materials by separately adding natural reinforcing composites, nano-composites, modified titanium dioxide and fiber reinforcing materials to the ceramic materials, and cannot achieve the purpose of both improving the strength of the ceramic materials and not increasing a large amount of production costs.

[0006] (2) Technical Solutions

[0007] To achieve the above purposes, the present invention is realized through the following technical solutions: A preparation process of silicon nitride ceramic materials specifically includes the following steps:

[0008] S1. Weighing and processing of raw materials: Weigh 40 - 50 parts of silicon nitride powder, 10 - 20 parts of natural reinforcing composite material, 10 - 20 parts of nanocomposite material, 10 - 20 parts of modified titanium dioxide, 5 - 10 parts of fiber reinforcing material, 3 - 5 parts of barium carbonate powder and 50 - 60 parts of solvent respectively through batching equipment;

[0009] S2. Grinding and screening treatment: Grind the silicon nitride powder, natural reinforcing composite material, nanocomposite material, modified titanium dioxide, fiber reinforcing material and barium carbonate powder weighed in step S1 successively through grinding equipment, and screen through a 100 - 200 mesh sieve;

[0010] S3. Ball milling and pressing treatment: Add the powder screened in step S2 into the solvent successively for ball milling, then dry and screen the obtained slurry, and press and mold it to obtain a blank;

[0011] S4. Calcination and heat treatment: Calcinate the blank in a nitrogen atmosphere in a high - temperature furnace at a calcination temperature of 1250 - 1350 °C and a calcination pressure of 100000 - 150000 kg / m 2 for a hot - pressing treatment time of 7 - 8 h, heat it up at a preset speed and then keep it warm, and obtain silicon nitride ceramic material after cooling.

[0012] Preferably, in step S1, weigh 45 parts of silicon nitride powder, 15 parts of natural reinforcing composite material, 15 parts of nanocomposite material, 15 parts of modified titanium dioxide, 7 parts of fiber reinforcing material, 4 parts of barium carbonate powder and 55 parts of solvent respectively through batching equipment.

[0013] Preferably, in step S1, weigh 40 parts of silicon nitride powder, 10 parts of natural reinforcing composite material, 10 parts of nanocomposite material, 10 parts of modified titanium dioxide, 5 parts of fiber reinforcing material, 3 parts of barium carbonate powder and 50 parts of solvent respectively through batching equipment.

[0014] Preferably, in step S1, weigh 50 parts of silicon nitride powder, 20 parts of natural reinforcing composite material, 20 parts of nanocomposite material, 20 parts of modified titanium dioxide, 10 parts of fiber reinforcing material, 5 parts of barium carbonate powder and 60 parts of solvent respectively through batching equipment.

[0015] Preferably, the fiber reinforcing material in step S1 is one of carbon fiber or silicon carbon fiber.

[0016] Preferably, the nanocomposite material in step S1 is any combination of two or more of nanosilicon carbide, nano - magnesium oxide or nano - zirconium dioxide.

[0017] Preferably, the solvent in step S1 is one of anhydrous ethanol solution or polyethylene glycol solution.

[0018] Preferably, in the step S1, the natural reinforced composite material is any combination of two or more of halloysite, talcum powder, kaolin, quartz sand or montmorillonite.

[0019] (III) Beneficial effects

[0020] The present invention provides a preparation process of silicon nitride ceramic materials. Compared with the prior art, it has the following beneficial effects: The preparation process of the silicon nitride ceramic materials specifically includes the following steps: S1. Weighing and processing of raw materials: Respectively measure 40-50 parts of silicon nitride powder, 10-20 parts of natural reinforced composite material, 10-20 parts of nano-composite material, 10-20 parts of modified titanium dioxide, 5-10 parts of fiber reinforced material, 3-5 parts of barium carbonate powder and 50-60 parts of solvent through batching equipment; S2. Grinding and screening treatment: Grind the silicon nitride powder, natural reinforced composite material, nano-composite material, modified titanium dioxide, fiber reinforced material and barium carbonate powder weighed in the step S1 in sequence through a grinding device, and screen through a 100-200 mesh sieve; S3. Ball milling and die pressing treatment: Add the powder screened in the step S2 into the solvent in sequence for ball milling, then dry and screen the obtained slurry, and press and mold to obtain a blank; S4. Calcination and heat treatment: Calcinate the blank in a high-temperature furnace under a nitrogen atmosphere at a calcination temperature of 1250-1350 °C and a calcination pressure of 100000-150000 kg / m 2 Under the condition that the hot pressing treatment time is 7-8 h, heat up at a preset speed and then keep warm, and cool to obtain the silicon nitride ceramic material. It can be realized that by adding natural reinforced composite material, nano-composite material, modified titanium dioxide and fiber reinforced material into the ceramic material respectively, the strength, wear resistance and heat resistance of the silicon nitride ceramic material are greatly improved, the preparation process of the silicon nitride ceramic material is greatly simplified, and the purpose of improving the strength of the ceramic material without increasing a large amount of production cost is well achieved, thus greatly facilitating the silicon nitride ceramic material. Description of the drawings

[0021] Figure 1 It is a schematic structural diagram of the present invention. Specific embodiments

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] Please refer to Figure 1 , the embodiments of the present invention provide four technical solutions: A preparation process of silicon nitride ceramic materials specifically includes the following embodiments:

[0024] Example 1: A preparation process of silicon nitride ceramic material specifically includes the following steps:

[0025] S1. Weighing and processing of raw materials: Respectively measure 45 parts of silicon nitride powder, 15 parts of natural reinforcing composite material, 15 parts of nano-composite material, 15 parts of modified titanium dioxide, 7 parts of fiber reinforcing material, 4 parts of barium carbonate powder and 55 parts of solvent through batching equipment. The fiber reinforcing material is carbon fiber, the nano-composite material is a composition of nano-silicon carbide, nano-magnesium oxide and nano-zirconia, the solvent is anhydrous ethanol solution, and the natural reinforcing composite material is a composition of halloysite, talc powder, kaolin, quartz sand and montmorillonite;

[0026] S2. Grinding and screening treatment: Grind the silicon nitride powder, natural reinforcing composite material, nano-composite material, modified titanium dioxide, fiber reinforcing material and barium carbonate powder weighed in step S1 in sequence through a grinding device, and screen through a 150-mesh sieve;

[0027] S3. Ball milling and molding treatment: Add the powder screened in step S2 into the solvent in sequence for ball milling, then dry and screen the obtained slurry, and press and mold to obtain a blank;

[0028] S4. Calcination and heat treatment: Heat-press the blank in a nitrogen atmosphere in a high-temperature furnace at a calcination temperature of 1300 °C and a calcination pressure of 130000 kg / m 2 for 7.5 h under the condition of, heat up at a preset speed and then keep warm, and obtain the silicon nitride ceramic material after cooling.

[0029] Example 2: A preparation process of silicon nitride ceramic material specifically includes the following steps:

[0030] S1. Weighing and processing of raw materials: Respectively measure 40 parts of silicon nitride powder, 10 parts of natural reinforcing composite material, 10 parts of nano-composite material, 10 parts of modified titanium dioxide, 5 parts of fiber reinforcing material, 3 parts of barium carbonate powder and 50 parts of solvent through batching equipment. The fiber reinforcing material is silicon carbon fiber, the nano-composite material is a composition of nano-silicon carbide and nano-magnesium oxide, the solvent is polyethylene glycol solution, and the natural reinforcing composite material is a composition of halloysite, talc powder and kaolin;

[0031] S2. Grinding and screening treatment: Grind the silicon nitride powder, natural reinforcing composite material, nano-composite material, modified titanium dioxide, fiber reinforcing material and barium carbonate powder weighed in step S1 in sequence through a grinding device, and screen through a 100-mesh sieve;

[0032] S3. Ball milling and molding treatment: Add the powder screened in step S2 into the solvent in sequence for ball milling, then dry and screen the obtained slurry, and press and mold to obtain a blank;

[0033] S4. Calcination heat treatment: The blank is calcined in a high-temperature furnace under a nitrogen atmosphere at a calcination temperature of 1250 °C and a calcination pressure of 100,000 kg / m 2 for 7 h under the condition of hot pressing treatment, heated up at a preset speed and then kept warm, and a silicon nitride ceramic material is obtained after cooling.

[0034] Example 3: A preparation process of a silicon nitride ceramic material, specifically including the following steps:

[0035] S1. Weighing treatment of raw materials: 50 parts of silicon nitride powder, 20 parts of natural reinforcing composite material, 20 parts of nano-composite material, 20 parts of modified titanium dioxide, 10 parts of fiber reinforcing material, 5 parts of barium carbonate powder and 60 parts of solvent are respectively measured by batching equipment. The fiber reinforcing material is silicon carbon fiber, the nano-composite material is a composition of nano-magnesium oxide and nano-zirconia, the solvent is anhydrous ethanol solution, and the natural reinforcing composite material is a composition of quartz sand and montmorillonite;

[0036] S2. Grinding and screening treatment: The silicon nitride powder, natural reinforcing composite material, nano-composite material, modified titanium dioxide, fiber reinforcing material and barium carbonate powder weighed in step S1 are successively ground by a grinding device and screened through a 200-mesh sieve;

[0037] S3. Ball milling and die pressing treatment: The powder screened in step S2 is successively added to the solvent for ball milling, and then the obtained slurry is dried, screened, and die-pressed to obtain a blank;

[0038] S4. Calcination heat treatment: The blank is calcined in a high-temperature furnace under a nitrogen atmosphere at a calcination temperature of 1350 °C and a calcination pressure of 150,000 kg / m 2 for 8 h under the condition of hot pressing treatment, heated up at a preset speed and then kept warm, and a silicon nitride ceramic material is obtained after cooling.

[0039] Example 4: A preparation process of a silicon nitride ceramic material, specifically including the following steps:

[0040] S1. Weighing treatment of raw materials: 43 parts of silicon nitride powder, 13 parts of natural reinforcing composite material, 6 parts of modified titanium dioxide, 13 parts of nano-composite material, 6 parts of fiber reinforcing material, 4 parts of barium carbonate powder and 53 parts of solvent are respectively measured by batching equipment. The fiber reinforcing material is silicon carbon fiber, the nano-composite material is a composition of nano-silicon carbide and nano-zirconia, the solvent is polyethylene glycol solution, and the natural reinforcing composite material is a composition of halloysite, talc powder and montmorillonite;

[0041] S2. Grinding and screening treatment: The silicon nitride powder, natural reinforcement composite material, nano-composite material, modified titanium dioxide, fiber reinforcement material, and barium carbonate powder weighed in step S1 are successively subjected to grinding treatment through a grinding device and then screened through a 120-mesh sieve;

[0042] S3. Ball milling and molding treatment: The powder screened in step S2 is successively added to a solvent for ball milling, and then the obtained slurry is dried and screened, and then molded by pressing to obtain a blank;

[0043] S4. Calcination and heat treatment: The blank is calcined in a high-temperature furnace under a nitrogen atmosphere at a calcination temperature of 1290 °C and a calcination pressure of 120000 kg / m 2 The hot pressing treatment time is 7.3 h, and after heating at a preset speed and then holding for heat preservation, and cooling, a silicon nitride ceramic material is obtained.

[0044] In summary, the present invention can greatly improve the strength, wear resistance, and heat resistance of the silicon nitride ceramic material by adding natural reinforcement composite materials, nano-composite materials, modified titanium dioxide, and fiber reinforcement materials to the ceramic material respectively, greatly simplifies the preparation process of the silicon nitride ceramic material, and well achieves the purpose of improving the strength of the ceramic material without increasing a large amount of production cost, thus greatly facilitating the silicon nitride ceramic material.

[0045] At the same time, the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0046] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprises", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0047] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A preparation process of a silicon nitride ceramic material, characterized in that: Specifically, it includes the following steps: S1. Weighing and processing of raw materials: Respectively measure 40 - 50 parts of silicon nitride powder, 10 - 20 parts of natural reinforcing composite material, 5 - 10 parts of modified titanium dioxide, 10 - 20 parts of nanocomposite material, 5 - 10 parts of fiber reinforcing material, 3 - 5 parts of barium carbonate powder and 50 - 60 parts of solvent through batching equipment; S2. Grinding and screening processing: Grind the silicon nitride powder, natural reinforcing composite material, nanocomposite material, modified titanium dioxide, fiber reinforcing material and barium carbonate powder weighed in step S1 successively through grinding equipment, and screen through a 100 - 200 mesh sieve; S3. Ball milling and molding processing: Add the powder screened in step S2 into the solvent successively for ball milling, then dry and sieve the obtained slurry, and press and mold it to obtain a blank; S4. Calcination heat treatment: Calcine the green body in a nitrogen atmosphere in a high-temperature furnace at a calcination temperature of 1250 - 1350 °C and a calcination pressure of 100000 - 150000 kg / m 2 under the condition that the hot pressing treatment time is 7 - 8 h, heat up at a preset speed and then keep warm, and obtain a silicon nitride ceramic material after cooling.

2. The preparation process of the silicon nitride ceramic material according to claim 1, characterized in that: In step S1, 45 parts of silicon nitride powder, 15 parts of natural reinforcing composite material, 15 parts of nanocomposite material, 15 parts of modified titanium dioxide, 7 parts of fiber reinforcing material, 4 parts of barium carbonate powder and 55 parts of solvent are respectively measured through batching equipment.

3. The preparation process of the silicon nitride ceramic material according to claim 1, characterized in that: In step S1, 40 parts of silicon nitride powder, 10 parts of natural reinforcing composite material, 10 parts of nanocomposite material, 10 parts of modified titanium dioxide, 5 parts of fiber reinforcing material, 3 parts of barium carbonate powder and 50 parts of solvent are respectively measured through batching equipment.

4. The preparation process of a silicon nitride ceramic material according to claim 1, characterized in that: In step S1, 50 parts of silicon nitride powder, 20 parts of natural reinforcing composite material, 20 parts of nanocomposite material, 20 parts of modified titanium dioxide, 10 parts of fiber reinforcing material, 5 parts of barium carbonate powder and 60 parts of solvent are respectively measured through batching equipment.

5. The preparation process of a silicon nitride ceramic material according to any one of claims 1-4, characterized in that: In step S1, the fiber reinforcing material is one of carbon fiber or silicon carbon fiber.

6. The preparation process of a silicon nitride ceramic material according to any one of claims 1-4, characterized in that: In step S1, the nanocomposite material is any combination of two or more of nano - silicon carbide, nano - magnesium oxide or nano - zirconia.

7. The preparation process of a silicon nitride ceramic material according to any one of claims 1-4, characterized in that: In step S1, the solvent is one of anhydrous ethanol solution or polyethylene glycol solution.

8. The preparation process of a silicon nitride ceramic material according to any one of claims 1-4, characterized in that: In step S1, the natural reinforcing composite material is any combination of two or more of halloysite, talcum powder, kaolin, quartz sand or montmorillonite.

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