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Eutectic powder additive for ceramics production or weld and method for preparing the same

A technology of eutectic powder and additives, applied in the field of producing ceramics or eutectic powder additives for ceramic welding and its preparation

Inactive Publication Date: 2010-10-27
李根法
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And the mixture of components in the eutectic combination of transition metals (such as Sc, La, Cr, V, Ti, Zr, Nb, Ta, Hf, Mo, W) compounds containing three, four, five and six subgroups The powder or the mixed powder as the raw material and the mixed powder with eutectic composite structure formed by the eutectic reaction are used as additives for TiB 2 、Si 3 N 4 , SiC, cubic BN and B 4 The sintering or welding of structural ceramics such as C has not been reported yet.

Method used

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  • Eutectic powder additive for ceramics production or weld and method for preparing the same
  • Eutectic powder additive for ceramics production or weld and method for preparing the same
  • Eutectic powder additive for ceramics production or weld and method for preparing the same

Examples

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Effect test

Embodiment 1

[0164] Take Al 2 o 3 / NdAlO 3 / ZrO 2 Examples of the preparation of eutectic powder additives, in image 3 In, Al 2 o 3 / NdAlO 3 / ZrO 2 The preparation formula of the eutectic composite powder is 55-65mol% Al 2 o 3 , 15-25mol% Nd 2 o 3 , 15-30mol% ZrO 2 , melting temperature is 1700±30℃, with Nd 2 o 3 , ZrO 2 and Al 2 o 3 Powder as raw material, according to 55-65mol% Al 2 o 3 , 15-25mol% Nd 2 o 3 , 15-30mol% ZrO 2 , Proportional mixing, after stirring evenly, the eutectic powder is obtained. The eutectic powder is pressed into a cylindrical body with a diameter of 5-20 mm under a pressure of 10-20 MPa, and then melted in 20 cmHg of Ar gas in a small DC electric arc furnace with a rated voltage of 100 V and a current of 600 A. system. The phase of the prepared eutectic composite ceramics is Al 2 o 3 , NdAlO 3 and ZrO 2 , the microstructure is columnar structure, see Figure 7 (a), where the small white round particles are NdAlO 3 , the white triang...

Embodiment 2

[0166] Take Al 2 o 3 / Y 3 Al 5 o 12 / ZrO 2 Eutectic Powder Additives as Sintering Aids to Reduce Si 3 N 4 And the sintering temperature of SiC ceramics as an example. exist Figure 4 Al 2 o 3 / Y 3 Al 5 o 12 / ZrO 2 The preparation formula of eutectic composite ceramic powder is 60-70mol% Al 2 o 3 , 10-20mol% Y 2 o 3 , 15-25mol% ZrO 2 . to Y 2 o 3 , ZrO 2 and Al 2 o 3 Powder is raw material, and the eutectic composite ceramic phase that makes by the same method of embodiment 1 is Al 2 o 3 , Y 3 Al 5 o 12 and ZrO 2 , the microstructure is a layered structure, and the layered particles Y 3 Al 5 o 12 , Al 2 o 3 and ZrO 2 The thicknesses are 600nm, 200nm and 600nm respectively, see Figure 7 (b). Al prepared above 2 o 3 / Y 3 Al 5 o 12 / ZrO 2 The eutectic composite ceramics are crushed into a eutectic composite powder with a particle size of 0.5-50 μm in a mortar.

[0167] exist Figure 4 It can be seen that Al 2 o 3 / Y 3 Al 5 o 12 / Z...

Embodiment 3

[0175] Take VN / SiC / B 4 C eutectic powder additive as sintering aid to reduce TiB 2 Examples of sintering temperatures for ceramics. exist Figure 6 Medium VN / SiC / B4 C is a eutectic system, SiC, VN and B 4 The C component can form a eutectic reaction, and the preparation formula of the VN / SiC / B4C eutectic powder is 18-22mol% VN, 46-54mol% B4C, 26-34mol% SiC.VN, SiC and B4C powder according to the component 18- Mix 22mol% VN, 46-54mol% B4C, and 26-34mol% SiC, and stir to obtain eutectic powder. The eutectic powder is used as a raw material, and is pressed into a cylindrical green body with a diameter of 5-20 mm under a pressure of 10-20 MPa. Then in a small DC electric arc furnace with a rated voltage of 100V and a current of 600A, it is melted in an Ar atmosphere of 20cmHg. The phases of the prepared eutectic composite ceramics are C, VB 2 , SiC and B 4 C, the eutectic melting temperature is 1870±20°C, the microstructure is rod-like structure, VB with a diameter of 600nm...

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Abstract

The sintering of ceramics such as B4 and SiC , etc. commonly adopts single-phase powders as additive agent, the invention adopts the eutectic powder such as TMB2 / SiC, TMB2 / SiC / B4C, C / TMB2 / SiC, VC / VB2 / SiC, TMB2 / SiC / MeB6, SiC / MeB6 / B4C, C / TMB2 / SiC / B4C and TMB2 / SiC / MeB6 / B4C eutectic powders as the sintering acid of the ceramics such as B4C and SiC etc., the sintering acid is the mixed powder which ishomogeneously mixed by each component in the random one combination that can produce eutectic reaction and is selected from the following components: C, Me, TM, MgO, TMO2, Me2O3, Me4Al2O9, MgAl2O4, MeAlO3, Me3Al5O12, TMN, TMC, TMB2, TMB, MeB6, MeN, Al2O3, SiC, and B4C, or the mixed powder with the eutectic composite structure and the granularity ranges from 1.5 to 50 mu m, and the mixed powder ismade by crushing and grinding the composite material which is got using the mixed powder as raw material with a high-temperature melting solidifying method. (TM=Sc, Si, Ce, AL, V, Cr, Cr, Ti, Zr, W, Mo, Nb, Ta, Hf; Me=Sc, Al, Ca, Y, La, RE, and the RE represents the rare earth element).

Description

technical field [0001] The present invention relates to ceramic production technology, especially eutectic powder additive and its preparation method, such as VB 2 / LaB 6 , VB 2 / LaB 6 / B 4 C. VB 2 / SiC / B 4 C. VN / SiC / B 4 C. VB 2 / SiC / VC, VB 2 / SiC / LaB 6 or VB 2 / SiC / B 4 C / LaB 6 Such as eutectic powder, such additives are mainly used for TiB 2 、Si 3 N 4 , SiC, cubic BN or B 4 Sintering of C and other single-phase ceramics, composite ceramics, gradient ceramics and ceramic films, preparation of ceramic coatings, welding of ceramics and ceramics, ceramics and metals, etc. Background technique [0002] TiB 2 、Si 3 N 4 , SiC, cubic BN and B 4 Structural materials such as C have many excellent properties. Cubic BN, TiB as described in Thevenot, F.J.Eur.Ceram.Soc. 2 and B 4 C has a low density, extremely high hardness and strength, and can stop bullets. Hot-pressed sintered cubic BN, TiB 2 and B 4 C ceramics have been used to prepare body armor, lightweigh...

Claims

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Application Information

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IPC IPC(8): C04B35/64C04B35/65C04B35/01C04B35/52C04B35/58
CPCC04B2235/5445C04B2235/3206C04B2235/3839C04B2235/3804C04B2235/3821C04B2235/666C04B2235/3217C04B2235/3813C04B35/565C04B35/563C04B2235/3222C04B2235/3826C04B2235/3227C04B2235/3852C04B35/64C04B35/645C04B35/587C04B2235/3224C04B2235/5436C04B2235/3225
Inventor 李根法李汶军
Owner 李根法
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