Method for producing boron nitride nano tube reinforced and toughened zirconium oxide ceramic

A technology of boron nitride nanotubes and zirconia ceramics, which is applied in the field of boron nitride nanotubes to strengthen and toughen zirconia ceramics, which can solve the problems of high brittleness and poor effect of carbon nanotubes on the strengthening and toughening of zirconia ceramics. Achieve high production efficiency, high product mechanical properties, and low cost

Inactive Publication Date: 2011-11-02
SHANDONG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] In view of the above prior art, in order to overcome the problems of high brittleness of zirconia ceramics and poor effect of carbon nanotubes on strengthening and toughening zirconia ceramics, the present invention provides a method for strengthening and toughening zirconia ceramics with boron nitride nanotubes, The method has the advantages of low cost, stable processing technology, simple operation, high production efficiency, and high mechanical properties of the product.

Method used

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  • Method for producing boron nitride nano tube reinforced and toughened zirconium oxide ceramic
  • Method for producing boron nitride nano tube reinforced and toughened zirconium oxide ceramic
  • Method for producing boron nitride nano tube reinforced and toughened zirconium oxide ceramic

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Embodiment 1

[0024] Example 1: Determination of the trend of flexural strength and fracture toughness of boron nitride nanotube-reinforced and toughened zirconia ceramics with the addition of boron nitride nanotubes

[0025] With boron nitride nanotubes as reinforcement phase, 3Y-ZrO 2 Zirconia ceramics were prepared by hot pressing and sintering as the substrate. The sintering temperature is 1450°C, the sintering time is 2h, and the pressure is 25MPa. After the surface of the sintered sample was ground by a grinder, it was cut into four groups of samples with a size of 3×4×30 mm to measure the bending strength, and four groups of samples with a size of 2×4×30 mm to measure the fracture toughness.

[0026] The bending strength adopts the three-point bending method, and the span is 20mm. On a universal testing machine at a loading speed of 0.5 mm / min, press along the hot pressing direction to measure the flexural strength, and calculate the average value of four groups of samples to obtai...

Embodiment 2

[0029] Embodiment 2: Using boron nitride nanotubes as a reinforcing phase, with 3Y-ZrO 2 Zirconia ceramics were prepared by hot pressing and sintering as the substrate.

[0030] Weigh 0.45g of boron nitride nanotubes, 44.45g of zirconia, and 270g of zirconia grinding balls with a balance, measure 150ml of absolute ethanol with a graduated cylinder, put them into a ball mill jar, and mix them on a planetary ball mill. The rotating speed of the ball mill is 300r / min, and the ball milling time is 12 hours. The mixed slurry after ball milling was dried and sieved, put into an alumina crucible, heated to 400° C. in a muffle furnace and kept for 1 hour for pre-sintering. After cooling, take out the mixed powder, place it in a graphite mold with a diameter of 42mm, heat up to 1450°C in a multifunctional sintering furnace at a rate of 25°C / min, and sinter at a sintering pressure of 25MPa, stop heating after 1 hour of heat preservation, and cool naturally to room temperature . The s...

Embodiment 3

[0031] Embodiment 3: with boron nitride nanotube as reinforcing phase, with 3Y-ZrO 2 Zirconia ceramics were prepared by hot pressing and sintering as the substrate.

[0032] Weigh 0.25g of boron nitride nanotubes, 49.75g of zirconia, and 300g of zirconia grinding balls with a balance, measure 150ml of absolute ethanol with a graduated cylinder, put them into a ball mill jar, and mix them on a planetary ball mill. The rotating speed of the ball mill is 300r / min, and the ball milling time is 12 hours. The mixed slurry after ball milling was dried and sieved, put into an alumina crucible, heated to 400° C. in a muffle furnace and kept for 1 hour for pre-sintering. After cooling, take out the mixed powder, put it in a graphite mold with a diameter of 42mm, heat up to 1450°C in a multifunctional sintering furnace at a rate of 25°C / min, and sinter at a sintering pressure of 25MPa, stop heating after 2 hours of heat preservation, and naturally cool to room temperature . The sinter...

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Abstract

The invention discloses a method for producing boron nitride nano tube reinforced and toughened zirconium oxide ceramic, which comprises the following operations of: weighing boron nitride nano tube, zirconium oxide powder and zirconium oxide grinding balls, measuring anhydrous ethanol and pouring the anhydrous ethanol into a ball milling tank, and performing ball milling; drying the mixed slurryin an oven after ball milling, screening the dried mixed slurry, filling the screened powder into an alumina crucible, and pre-sintering the powder in a muffle furnace; filling the pre-sintered powder into a graphite mould, sintering the powder in a multifunctional sintering furnace, and naturally cooling the sintered powder to room temperature; and obtaining a finished product by mechanical processing of the sintered body such as grinding, cutting and the like. The method has the advantages of low cost, stable processing process, simple operation treatment, high production efficiency, high mechanical property of the product and the like. Under the same process condition, the bending strength of the zirconium oxide ceramic added with the boron nitride nano tube reaches 1,143.3MPa and is improved by 28 percent compared with pure zirconium oxide ceramic; and the fracture toughness reaches 14.3MPa.m1 / 2 and is improved by 80 percent compared with the pure zirconium oxide ceramic.

Description

technical field [0001] The invention relates to a method for strengthening and toughening zirconia ceramics with boron nitride nanotubes. Background technique [0002] Zirconia has excellent physical and chemical properties, such as high room temperature mechanical properties, good wear resistance, and chemical corrosion resistance, especially the phase transition of zirconia with temperature changes, in which the transition from tetragonal phase to monoclinic phase That is, martensitic phase transformation, which can play a unique role in phase transformation and toughening; at the same time, zirconia composite materials have some unique properties under different conditions, showing sensitivity to electricity, light, sound, gas and temperature. Therefore, zirconia is not only widely used in refractory materials and structural materials, but also has broad application prospects in industrial production fields such as functional materials and electronic materials. [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/48C04B35/622
Inventor 白玉俊徐久皎王伟礼亓永新伦宁毕见强王守仁
Owner SHANDONG UNIV
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