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Electrosparking and mechanical processing Si3N4-ZrSi2-BN composite ceramic material and preparation method

A technology for machining and multiphase ceramics is applied in the field of Si3N4-ZrSi2-BN multiphase ceramic materials and preparation, and achieves the effects of uniform microstructure, simple preparation process and excellent performance.

Inactive Publication Date: 2016-08-03
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

ZrSi 2 The conductivity is 132×10 4 ·Ω -1 m -1 , has excellent electrical conductivity, but so far, no ZrSi 2 Introducing Si 3 N 4 Ceramics, achieving their EDM properties are reported
At the same time, it has not yet appeared in Si 3 N 4 Adding ZrSi to ceramics at the same time 2 phase and BN phase, so that it has both EDM and machining performance reports

Method used

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  • Electrosparking and mechanical processing Si3N4-ZrSi2-BN composite ceramic material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Si 3 N 4 -ZrSi 2 -The preparation of BN composite phase ceramics, the specific method is as follows:

[0028] (1) with Si 3 N 4 powder (96% purity, particle size 2 (purity is 99%, particle size is 40nm) and boron (purity is 99%, particle size is 2 o 3 Auxiliaries are compounded, wherein the mass fraction ratio of raw materials and auxiliaries is 95% and 5%, Si 3 N 4 , ZrB 2 And the mass fraction ratio of B is 70.4%, 27.8% and 1.8%, MgO and Y 2 o 3The mass fraction ratio is 50% and 50%, with ethanol as solvent and Si 3 N 4 The ball is the ball milling medium, mixed on the roller ball mill for 24 hours, after mixing and drying, the MgO-Y 2 o 3 Auxiliary Si 3 N 4 -ZrB 2 -B mixed powder.

[0029] (2) Will contain MgO-Y 2 o 3 Auxiliary Si 3 N 4 -ZrB 2 -B mixed powder is put into the graphite mold that inner wall surface is coated with BN, carries out reaction hot pressing sintering according to two-step heat preservation method, and described two-step he...

Embodiment 2

[0032] (1) with Si 3 N 4 powder (96% purity, particle size 2 (purity is 99%, particle size is 40nm) and boron (purity is 99%, particle size is 2 o 3 Additives are compounded, wherein the mass fraction ratio of raw materials and additives is 90% and 10%, Si 3 N 4 , ZrB 2 And the mass fraction ratio of B is 70.4%, 27.8% and 1.8%, MgO and Y 2 o 3 The mass fraction ratio is 50% and 50%, with ethanol as solvent and Si 3 N 4 The ball is the ball milling medium, mixed on the roller ball mill for 24 hours, after mixing and drying, the MgO-Y 2 o 3 Auxiliary Si 3 N 4 -ZrB 2 -B mixed powder.

[0033] (2) Will contain MgO-Y 2 o 3 Auxiliary Si 3 N 4 -ZrB 2 -B mixed powder is put into the graphite mold that inner wall surface is coated with BN, carries out reaction hot pressing sintering according to two-step heat preservation method, and described two-step heat preservation method comprises: will contain MgO-Y 2 o 3 Auxiliary Si 3 N 4 -ZrB 2 -B The temperature of the ...

Embodiment 3

[0036] The mass fraction ratio of raw materials and additives is 95% and 5%, Si 3 N 4 , ZrB 2 And the mass fraction ratio of B is 83%, 16% and 1%, MgO and Y 2 o 3 The mass fraction ratio is 50% and 50%, and Si is prepared according to the method of Example 1 3 N 4 -ZrSi 2 -BN composite phase ceramics, wherein, the batching roller ball mill is mixed for 24 hours; wherein, the two-step heat preservation method is specifically: the first step, the heating rate is 20°C / min, the temperature rises to 1600°C, and the heat preservation is 2h; the second step, The heating rate was 10°C / min, filled with nitrogen and heated up to 1750°C, while applying a pressure of 30MPa, keeping the pressure for 1h, and obtained Si that can be processed by EDM and machining. 3 N 4 -ZrSi 2 -BN composite ceramic material. The relative density of the prepared ceramic material is 98%, the hardness of the material is 8GPa, and the fracture toughness is 5MPa m 1 / 2 , The bending strength is 450MPa. ...

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Abstract

The invention belongs to the field of non-oxide based ceramic materials, and discloses an electrosparking and mechanical processing Si3N4-ZrSi2-BN composite ceramic material and a preparation method thereof. The preparation method comprises the following steps: by taking Si3N4 powder, ZrB2 powder and boron powder as raw materials and MgO and Re2O3 as additives, mixing, and drying so as to obtain Si3N4-ZrB2-B mixed powder containing the additives; putting the mixed powder into a mold, and in the presence of nitrogen, performing reactive hot pressed sintering according to a two-step heat preservation method, thereby obtaining the Si3N4-ZrSi2-BN composite ceramic material. The relative density of the composite ceramic material is greater than 95%, the bending strength of the composite ceramic material is 50-1000 MPa, the breakage toughness of the composite ceramic material is 2-10 MPa*m<1 / 2>, and the hardness of the composite ceramic material is 1-16 GPa; due to the excellent conductivity of ZrSi2, BN has good mechanical processing properties, so that the composite ceramic material prepared by the preparation method has the electrosparking property and the mechanical processing property as well.

Description

technical field [0001] The invention belongs to the field of non-oxide-based ceramic materials, in particular to a Si that can be processed by electrical discharge machining and machining. 3 N 4 -ZrSi 2 -BN composite phase ceramic material and preparation method. Background technique [0002] Si 3 N 4 Ceramics have excellent properties such as high strength, high toughness, and high thermal conductivity, and are widely used in cutting tools, ceramic heat dissipation substrates, mechanical parts and other fields. Due to its inherent high hardness and high brittleness, its machinability is poor. BN ceramics have a graphite-like layered structure with low hardness, and can be processed by turning, milling, planing, drilling, etc. A large number of literature reports indicate that the introduction of BN into Si 3 N 4 In ceramics, its machinability can be significantly improved. [0003] Si 3 N 4 Ceramics are non-conductive ceramics. By adding conductive phases (TiN, T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/645
CPCC04B35/5935C04B35/645C04B2235/3206C04B2235/3225C04B2235/3813C04B2235/386C04B2235/3891C04B2235/421C04B2235/6562C04B2235/77
Inventor 郭伟明苏国康吴利翔游洋林华泰伍尚华
Owner GUANGDONG UNIV OF TECH
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