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Preparation method of modified ZTA complex-phase ceramic having good wettability with steel melts

A composite ceramic and wettability technology, which is applied in the fields of ceramic matrix composites and metal matrix composites, can solve problems such as difficult enrichment, insufficient wettability, and poor bonding strength, and achieve improved interface reaction ability, wettability, etc. The effect of good wetness and simple process

Inactive Publication Date: 2018-09-28
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the elements in the existing ZTA particles are not easy to enrich at the interface of ZTA particles / steel melt, which is one of the factors causing insufficient wettability, resulting in poor bonding strength between the two

Method used

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  • Preparation method of modified ZTA complex-phase ceramic having good wettability with steel melts
  • Preparation method of modified ZTA complex-phase ceramic having good wettability with steel melts
  • Preparation method of modified ZTA complex-phase ceramic having good wettability with steel melts

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Embodiment 1

[0022] In this embodiment, a method for preparing a modified ZTA composite ceramic with good wettability with molten steel, the specific steps are as follows:

[0023] Step 1, adopt chemical co-precipitation method to prepare 5mol% YSZ powder, at first be that zirconium oxychloride octahydrate (ZrOCl 2 ·8H 2 O) and yttrium nitrate hexahydrate (Y(NO 3 ) 3 ·6H 2 O) Press Y 2 o 3 :ZrO 2 The ratio of the molar ratio of 5:95 is dissolved in the mixed solvent of absolute ethanol and deionized water (the volume ratio of absolute ethanol and deionized water is 5:1), and a total amount of 1wt.% polyethylene glycol is added Alcohol (PEG) was used as a dispersant, and then the mixed solution was placed in a constant temperature water bath, and after being kept at 65°C for 2 hours, a 5mol% YSZ powder precursor was prepared by forward titration, according to the proportion of YSZ powder in the final composite ceramics The proportion of 25 wt.% of the total mass, after the precursor ...

Embodiment 2

[0030] In this embodiment, a method for preparing a modified ZTA composite ceramic with good wettability with molten steel, the specific steps are as follows:

[0031] Step 1. Prepare 1mol% YSZ powder by sol-gel method, first use ZrOCl 2 ·8H 2 O, Y (NO 3 ) 3 ·6H2 O press Y 2 o 3 :ZrO 2 The mol ratio is that the ratio of 1:99 is mixed with uniform solution, then adds the polyethylene glycol (PEG) of total amount 1wt.% as stabilizing agent and regulates solution pH value with hydrochloric acid and is 0.4, and H 2 C 2 o 4 2H 2 O is slowly titrated into the mixed solution until a transparent sol is formed, and a transparent gel-like colloid is obtained after aging treatment for 12 hours, and the H 2 C 2 o 4 The aqueous solution was dropped into it to obtain an opaque suspension. According to the proportion of YSZ powder accounting for 5 wt.% of the total mass of the final composite ceramic, after the formation of the suspension, 1 wt.% of the final composite ceramic mas...

Embodiment 3

[0037] In this embodiment, a method for preparing a modified ZTA composite ceramic with good wettability with molten steel, the specific steps are as follows:

[0038] Step 1, adopt the hydrothermal synthesis method to prepare 8mol% YSZ powder, first weigh zirconium oxychloride octahydrate and yttrium nitrate hexahydrate, press Y 2 o 3 :ZrO 2 Mix the molar ratio of 8:92, dissolve and filter with deionized water, use the reverse precipitation method to mix and stir the mixed solution and concentrated ammonia water according to the volume ratio of 1:1, the concentration of concentrated ammonia water is 28 wt.%, and then the obtained The precipitate was washed with deionized water to obtain a precursor. According to the proportion of YSZ powder accounting for 50wt.% of the total mass of the final composite ceramic, the precursor was mixed with 0.1wt.% Nb of the final composite ceramic mass. 2 o 5 、Nd 2 o 3 、Sm 2 o 3 、Gd 2 o 3 and Er 2 o 3 Mixed powder mixed, where Nb ...

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Abstract

The invention discloses a preparation method of a modified zirconia toughened alumina (ZTA) complex-phase ceramic having good wettability with steel melts, and belongs to the technical fields of ceramic-based composite materials and metal-based composite materials. The preparation method comprises the following steps: firstly, preparing yttria-stabilized zirconia (YSZ) powder by using a soft chemistry method, adding an rare-earth oxide in the process of preparing the YSZ powder, carrying out drying and calcinating, then uniformly carrying out mixing with Al2O3 and TiO2 powder, carrying out pre-pressing and pressing on the mixed powder, and carrying out high-temperature sintering to obtain a modified ZTA complex-phase ceramic block having good wettability with steel melts. The modified ZTAcomplex-phase ceramic prepared by the invention is low in cost, simple in process and high in production efficiency, has good wettability with steel melts under the condition of not changing the original toughness of ZTA particles, and can be directly used to prepare ceramic particle reinforced steel-based composite materials.

Description

technical field [0001] The invention relates to a preparation method of modified ZTA composite ceramics with good wettability with molten iron and steel, and belongs to the technical fields of ceramic matrix composite materials and metal matrix composite materials. Background technique [0002] Ceramic-metal composite materials have become the focus of domestic and foreign scientific research and industrialization because of their combination of high hardness, high wear resistance of ceramic materials and high strength, good plasticity and toughness of metals. The uniformly dispersed zirconia in the zirconia toughened alumina ceramic (ZTA) can significantly improve the wear performance of wear-resistant parts, and can also ensure its overall good toughness. It has been widely used in the field of wear-resistant materials. At present, related foreign products have been applied in industry, and have entered the Chinese market and formed a monopoly. However, the wettability of...

Claims

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Application Information

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IPC IPC(8): C04B35/119C04B35/488C04B35/49C04B35/622B22D23/04
CPCC04B35/119C04B35/4885C04B35/49C04B35/622B22D23/04C04B2235/3217C04B2235/3227C04B2235/3225C04B2235/3224C04B2235/3232C04B2235/3229C04B2235/3251C04B2235/5454C04B2235/5445C04B2235/5436C04B2235/656
Inventor 隋育栋蒋业华周谟金李祖来山泉
Owner KUNMING UNIV OF SCI & TECH
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