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Liquid phase sintering method of Si3N4-TiZrN2-TiN composite conductive ceramic

A composite conductive and liquid phase sintering technology, applied in the field of conductive ceramics, can solve the problems of poor hardness and fracture toughness, and achieve the effects of low resistivity, high fracture toughness and high mechanical strength

Inactive Publication Date: 2016-08-24
BEIFANG UNIV OF NATITIES
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Problems solved by technology

In the patent of CN1272283C, metal Ti and Ta are used, so that the resistivity of the final sintered composite silicon nitride is reduced to 10 0 Ω·cm level, just meet the requirements of electrical discharge machining, and its hardness and fracture toughness are worse than silicon nitride ceramics without conductive additives

Method used

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Embodiment Construction

[0014] A kind of Si 3 N 4 -TiZrN 2 -TiN composite conductive ceramics, the raw materials for synthesizing the composite conductive ceramics include: Si 3 N 4 , ZrN, TiN, Y 2 o 3 , La 2 o 3 , AlN; the final product of the composite conductive ceramic includes Si 3 N 4 phase, TiN phase and solid solution of metal nitride TiZrN 2 Mutually.

[0015] In this embodiment, Si 3 N 4 :TiN:Y 2 o 3 : La 2 o 3 : AlN=(9~11):(5.4~6.6):(0.8~1.2):(0.8~1.2):(1.3~1.66), the addition amount of ZrN is 8~15w.t%.

[0016] A kind of Si 3 N 4 -TiZrN 2 -Liquid phase sintering method of TiN composite conductive ceramics, Si 3 N 4 Choose powder with α phase content higher than 70%, purity higher than 97%, average particle size 0.7μm; Y 2 o 3 , La 2 o 3 and AlN are commercially available and chemically pure; TiN was purchased from Hefei Kaier Nano Energy Technology Co., Ltd., with a purity of 99.2% and an average particle size of 20nm; ZrN was purchased from Jinzhou Jinxin Co., Lt...

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Abstract

Provided is Si3N4-TiZrN2-TiN composite conductive ceramic. Raw materials for synthesizing the composite conductive ceramic comprise Si3N4, ZrN, TiN, Y2O3, La2O3 and AlN. The final product of the composite conductive ceramic comprises an Si3N4 phase, a TiN phase and a solid solution TiZrN2 phase of metal nitride. Due to addition of AlN, volatilization caused by adding of Al2O3 in a conventional mode is avoided, and the surface of the final product to which AlN is added can be smoother than that of the product to which Al2O3 is added. The invention further provides a liquid phase sintering method of the Si3N4-TiZrN2-TiN composite conductive ceramic. The Si3N4-TiZrN2-TiN composite conductive ceramic has the advantages that electrical resistance is low, wherein the sample resistance tested by an SX1944 four-probe tester for the composite conductive ceramic is at the 10-2 omega.cm order which is far lower than that of like products; the mechanical strength is high, wherein the load of the composite conductive ceramic is 10 kg, the pressurizing time is 5 s, the measured Vickers hardness of the sample is 14.7 GPa, the sample breaking tenacity calculated through the hardness indentation quadrangle expansion crack length is 7.8 MPa.m 0.5, and the original strength and hardness of silicon nitride ceramic are kept.

Description

Technical field: [0001] The invention relates to the technical field of conductive ceramics, in particular to a Si 3 N 4 -TiZrN 2 -Liquid phase sintering method of TiN composite conductive ceramics. Background technique: [0002] Silicon nitride (Si 3 N 4 ) is a structural ceramic material with good performance, which has light weight, high strength, high hardness, high corrosion resistance, etc., and can be used in various industries. There are many ways to prepare silicon nitride ceramic materials, such as hot pressing, normal pressure, reaction and other sintering methods, among which the normal pressure sintering method is simple and easy, and consumes less energy. Since silicon nitride is a covalent bond compound with a low self-diffusion coefficient, it is difficult to sinter directly into porcelain, so some oxides are often added as sintering aids for sintering. Commonly used are Al 2 o 3 , Y 2 o 3 , MgO 2 Wait. These additives form a liquid phase during t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/587
CPCC04B35/587C04B2235/3225C04B2235/3227C04B2235/3865C04B2235/3886C04B2235/5445C04B2235/5454C04B2235/658
Inventor 江涌吴澜尔黄新华
Owner BEIFANG UNIV OF NATITIES
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