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Method for low temperature preparation of diboride-carbide solid solution multiphase ceramic by reaction hot press sintering method

A diboride, hot pressing sintering technology, applied in the field of multiphase ceramic materials, can solve the problem of high sintering temperature, and achieve the effect of reducing sintering temperature, improving strength and toughness, and uniform and fine grain size

Active Publication Date: 2020-01-10
HARBIN INST OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] In order to solve the problem of high sintering temperature of existing diboride-carbide composite ceramics, the present invention provides a method for preparing diboride-carbide solid solution composite ceramics at low temperature by reaction hot pressing sintering method

Method used

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  • Method for low temperature preparation of diboride-carbide solid solution multiphase ceramic by reaction hot press sintering method
  • Method for low temperature preparation of diboride-carbide solid solution multiphase ceramic by reaction hot press sintering method
  • Method for low temperature preparation of diboride-carbide solid solution multiphase ceramic by reaction hot press sintering method

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Experimental program
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Effect test

specific Embodiment approach 1

[0021] (1) Mix the zirconium diboride powder and titanium carbide powder according to the molar mass ratio of 1:1, and use a high-energy ball mill for ball milling. The ball milling conditions are: ball material ratio 40:1, ball milling time 20h, speed 425r / min , to obtain a composite powder with uniform composition and fine particles;

[0022] (2) Put the composite powder in the mold, under vacuum or inert atmosphere, raise the temperature of the material at 30°C / min to 1750°C, pressurize at 30MPa at the temperature, keep it for 1h, and then lower it to room temperature at 30°C / min ;Demoulding, get (Ti,Zr)B 2 -(Zr,Ti)C solid solution composite ceramics (i).

[0023] For (Ti,Zr)B 2 -(Zr,Ti)C solid solution composite ceramic (i) was characterized for its mechanical properties. The results show that the hardness of the material at room temperature is 27.3±1.0GPa, the three-point bending strength is 597±32MPa, and the fracture toughness is 5.01MPa m 1 / 2 . The density of the m...

specific Embodiment approach 2

[0025] (1) Mix the zirconium diboride powder and titanium carbide powder according to the molar mass ratio of 1:1, and use a high-energy ball mill for ball milling. The ball milling conditions are: ball material ratio 40:1, ball milling time 20h, speed 425r / min , to obtain a composite powder with uniform composition and fine particles;

[0026] (2) Put the composite powder in the mold, under vacuum or inert atmosphere, heat the material at 30°C / min to 1800°C, pressurize at 30MPa at the temperature, keep it for 1h, and then lower it to room temperature at 30°C / min ;Demoulding, get (Ti,Zr)B 2 -(Zr,Ti)C solid solution composite ceramics (ii).

[0027] For (Ti,Zr)B 2 -(Zr,Ti)C solid solution composite ceramics (ii) XRD test, the test results are as follows figure 1 shown. Depend on figure 1 It can be seen that diboride and metal carbide undergo a solid-phase exchange reaction, and at the same time, the products can be solid-dissolved with each other to obtain a boride and car...

specific Embodiment approach 3

[0033] (1) Mix the zirconium diboride powder and titanium carbide powder according to the molar mass ratio of 1:1, and use a high-energy ball mill for ball milling. The ball milling conditions are: ball material ratio 40:1, ball milling time 20h, speed 425r / min , to obtain a composite powder with uniform composition and fine particles;

[0034] (2) Put the composite powder in the mold, under vacuum or inert atmosphere, heat the material at 30°C / min to 1900°C, pressurize at 30MPa at the temperature, keep it for 1h, and then lower it to room temperature at 30°C / min ;Demoulding, get (Ti,Zr)B 2 -(Zr,Ti)C solid solution composite ceramics (iii).

[0035] For (Ti,Zr)B 2-(Zr,Ti)C solid solution composite ceramic (iii) was characterized for its mechanical properties. The results show that the hardness of the material at room temperature is 27.3±1.5GPa, the three-point bending strength is 709±33MPa, and the fracture toughness is 5.61MPa m 1 / 2 . The density of the material is 5.65g ...

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Abstract

The invention relates to a method for low temperature preparation of a diboride-carbide solid solution multiphase ceramic by a reaction hot press sintering method, and belongs to the technical field of multiphase ceramic materials. The problem of high sintering temperature of an existing diboride-carbide multiphase ceramic is solved. According to the method for the low temperature preparation of the diboride-carbide solid solution multiphase ceramic by the reaction hot press sintering method, transition metal diboride and carbide which can produce solid phase exchange are selected, a compositepowder body is prepared by a high energy ball milling process, under the protection of vacuum or inert atmosphere, and the reaction hot press sintering is carried out to prepare the dense diboride-carbide solid solution multiphase ceramic. The solid-phase reaction and solid solution coupled synergistic process in the sintering process is fully used, compared with traditional hotpress sintering process for the preparation of multiphase ceramic materials directly using target diboronized and carbide powder bodies, the sintering temperature of the materials can be reduced by 250 DEG C to 400 DEGC, it is ensured that the material grain size is uniform and small by low temperature sintering, and the strength and toughness of the multiphase ceramic obtained are significantly improved.

Description

technical field [0001] The invention relates to a method for preparing diboride-carbide solid solution composite ceramics at low temperature by a reaction hot pressing sintering method, belonging to the technical field of composite ceramic materials. Background technique [0002] Transition metal diborides (MB 2 , such as TiB 2 ,ZrB 2 ,HfB 2 ,NbB 2 ,TaB 2 etc.) have excellent physical and chemical properties, such as high melting point, high hardness, high modulus, good thermal shock resistance and oxidation resistance, etc. However, since MB 2 It has strong covalent bonds and low self-diffusion coefficient, and can prepare MB at low temperature (<2000℃) without sintering aids 2 Ceramic materials are almost impossible to achieve. The industry has long referred to refractory metal carbides (B 4 C, VC, TiC, ZrC, SiC, WC, etc.) as MB 2 sintering aids. The most important mechanism for carbides to act as sintering aids is that carbides can interact with MB 2 Oxides...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/56C04B35/645
CPCC04B35/5607C04B35/5611C04B35/5622C04B35/58064C04B35/58078C04B35/645C04B2235/77C04B2235/96
Inventor 王玉金霍思嘉陈磊孔庆易刘鑫睿周玉
Owner HARBIN INST OF TECH
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