CN104529406A

CN104529406A - Method for preparing wear-resisting aluminum oxide ceramic by virtue of rare earth compound

Info

Publication number: CN104529406A
Application number: CN201410794512.XA
Authority: CN
Inventors: 吴婷婷; 吴伯麟
Original assignee: Guilin University of Technology
Current assignee: Guilin University of Technology
Priority date: 2014-12-19
Filing date: 2014-12-19
Publication date: 2015-04-22

Abstract

The invention discloses a method for preparing wear-resisting aluminum oxide ceramic by virtue of a rare earth compound. Raw materials of the aluminum oxide ceramic consist of the following components in percentage by mass: 69-99.7% of aluminum oxide, 0.0001-5% of a rare earth compound which is a compound of gadolinium, scandium, europium and lutecium, and 0.1-30% of a composite additive which is a compound of calcium, magnesium and silicon or a mineral. The method comprises the following materials: preparing materials according to a preparing ratio; ball-milling and grinding the prepared materials in a ball mill and uniformly mixing the materials; drying the uniformly mixed materials; preparing a blank by virtue of isostatic forming, roller forming or axial-compression forming; and sintering the obtained blank at 1000-1600 DEG C, preserving heat for 0.5-5hr, and naturally cooling to room temperature so as to obtain a finished product. By adding trace amount of the rare earth compound, the prepared aluminum oxide ceramic is fine in grain size and high in density. The method disclosed by the invention is simple in production process and low in requirement on equipment, and the prepared aluminum oxide ceramic is high in wear resistance and has a good application prospect.

Description

Rare earth compound is utilized to prepare the method for wear-resisting alumina ceramic

Technical field

The invention discloses a kind of method utilizing rare earth compound to prepare wear-resisting alumina ceramic.

Background technology

Alumina-ceramic has the intensity excellent over-all properties such as high, high temperature resistant, corrosion-resistant, is a kind of important stupalith, and alumina-ceramic abundant raw material, cheap, is applied to many fields.Only in Wear-resistant engineering ceramic material, just relate to all multi-products such as cutting tool, wortle, filar guide, bearing, ball valve, grinding medium.

For a long time, various countries scientific research personnel has carried out large quantity research in additive to affect Alumina Ceramics.Find in aluminum oxide, add sintering aid, transition metal oxide and rare earth oxide, contribute to obtaining desirable microstructure, improve ceramic performance.Such as, Mukhopadhyay thinks Y ₂o ₃solid solution can reduce grain boundary decision rate, improve ceramic wear-resisting performance; The little equality of beam have studied microtexture to Y-TZP/Al ₂o ₃the impact of composite ceramics polishing machine, result draws the fret wear better performances that crystal grain is tiny.

At present, though China is alumina producing big country, quality product is not high, belongs to low-and-medium-grade products more, and expensive goods depends on import, and expensive.Along with the domestic demand to expensive goods increases, China's independent research expensive goods is extremely urgent.Produce high-grade porcelain and need the grinding medium that purity is high, wear resisting property is good.Therefore, the middle alumina porcelain preparing wear resisting property excellence becomes one of important topic of research both at home and abroad.

Summary of the invention

The object of the invention is to provide a kind of method preparing alumina porcelain in wear resisting property excellence for above-mentioned existing problems.The method raw material is extensive, and manufacture is simple, and the aluminium oxide ceramic abrasive resistance prepared is good.

Concrete steps are:

(1) prepare burden by ratio of components; Feed components mass percent is: aluminum oxide 69-99.7 %, rare earth compound 0.0001-5%, the mass percent sum of raw material is 100%, and rare earth compound is the compound of gadolinium, scandium, europium and lutetium, composite additive 0.1-30%, composite additive is compound or the mineral of calcium, magnesium and silicon.

(2) material ball mill pulverizing step (1) prepared, to be mixed; Ball-milling Time is 5-96 hour, and ball milling adopts wet ball grinding, and amount of water and raw materials quality are than being 1:3-3:1.

(3) by after step (2) products therefrom drying, adopt isostatic pressed, roll forming or axial compression shaping, obtained base substrate.

(4) by step (3) gained base substrate at 1000-1600 DEG C of sintering, insulation 0.5-5 hour, be cooled to room temperature and obtain wear-resisting alumina ceramic.

(5) by standard: JC/T848.1 – 1999 carries out wear rate test to obtained finished product.

The compound of described rare earth gadolinium is the one in gadolinium sesquioxide, gadolinium carbonate, Gadolinium trinitrate, gadolinium oxalate, Gadolinium phosphate and gadolinium hydroxide.

The compound of described rare earth scandium is the one in Scium trioxide, scandium carbonate, Scium trinitrate, oxalic acid scandium, scandium phosphate and scandium hydroxide.

The compound of described rare-earth europium is the one in europium sesquioxide, europium carbonate, europium nitrate, oxalic acid europium, phosphoric acid europium and europium hydroxide.

The compound of described rare earth lutetium is the one in lutecium oxide, carbonic acid lutetium, lutecium nitrate, oxalic acid lutetium, lutetium and hydroxide lutetium.

The compound of described calcium is the compound that the mass percent of calcium oxide is greater than 45%, and the mineral of calcic are the one in limestone, aragonite, lime feldspar, calcite, rhombspar and chalk rock.

The compound of described silicon is the compound that the mass percent of silicon oxide is greater than 35%, and siliceous mineral are the one in kaolin, diopside, montmorillonite, pyrophyllite, talcum and serpentine.

The compound of described magnesium is the compound that magnesian mass percent is greater than 45%, and the mineral containing magnesium are the one in brucite, magnesite and rhombspar.

Test result shows: the alumina ceramic material wear rate that the present invention develops reaches 0.00483% h ^-1, compare and can improve 32% with the aluminium oxide ceramic abrasive resistance not mixing rare earth.

Main characteristics of the present invention is by adding rare earth compound (rare earth compound is the compound of gadolinium, scandium, europium and lutetium), composite additive (compound of calcium, magnesium and silicon or mineral), successfully have developed the alumina-ceramic of low wear rate.And abundant raw material source, manufacture be simple, be easy to suitability for industrialized production.

Embodiment

embodiment 1:

(1) prepare burden by ratio of components; Feed components mass percent is: aluminum oxide 99 %, kaolin 0.3%, calcite 0.3%, rhombspar 0.399% and Lu (OH) ₃0.001%.

(2) material ball mill pulverizing step (1) prepared, to be mixed; Ball-milling Time is 48 hours, and ball milling adopts wet ball grinding, and amount of water and raw materials quality are than being 1:3.

(3) by after step (2) products therefrom drying, isostatic pressing under 80MP pressure, pressurize 10 minutes, makes spherical base substrate.

(4) by step (3) gained base substrate at 1400 DEG C of sintering, be incubated 1.5 hours, be cooled to room temperature and obtain wear-resisting alumina ceramic.

By standard: JC/T848.1 – 1999 carries out wear rate test to obtained wear-resisting alumina ceramic, wear rate is 0.00687%h ^-1.

embodiment 2:

(1) prepare burden by ratio of components; Feed components mass percent is: aluminum oxide 98 %, kaolin 0.65%, limestone 0.65%, magnesite 0.69% and Sc ₂o ₃0.01%.

(2) material ball mill pulverizing step (1) prepared, to be mixed; Ball-milling Time is 56 hours, and ball milling adopts wet ball grinding, and amount of water and raw materials quality are than being 3:1.

(4) by step (3) gained base substrate at 1425 DEG C of sintering, be incubated 1 hour, be cooled to room temperature and obtain wear-resisting alumina ceramic.

By standard: JC/T848.1 – 1999 carries out wear rate test to obtained wear-resisting alumina ceramic, wear rate is 0.00597%h ^-1.

Claims

1. utilize rare earth compound to prepare a method for wear-resisting alumina ceramic, it is characterized in that concrete steps are:

(1) prepare burden by ratio of components; Feed components mass percent is: aluminum oxide 69-99.7 %, rare earth compound 0.0001-5%, the mass percent sum of raw material is 100%, and rare earth compound is the compound of gadolinium, scandium, europium and lutetium, composite additive 0.1-30%, composite additive is compound or the mineral of calcium, magnesium and silicon;

(2) material ball mill pulverizing step (1) prepared, to be mixed; Ball-milling Time is 5-96 hour, and ball milling adopts wet ball grinding, and amount of water and raw materials quality are than being 1:3-3:1;

(3) by after step (2) products therefrom drying, adopt isostatic pressed, roll forming or axial compression shaping, obtained base substrate;

(4) by step (3) gained base substrate at 1000-1600 DEG C of sintering, insulation 0.5-5 hour, be cooled to room temperature and obtain wear-resisting alumina ceramic;

The compound of described rare earth gadolinium is the one in gadolinium sesquioxide, gadolinium carbonate, Gadolinium trinitrate, gadolinium oxalate, Gadolinium phosphate and gadolinium hydroxide;

The compound of described rare earth scandium is the one in Scium trioxide, scandium carbonate, Scium trinitrate, oxalic acid scandium, scandium phosphate and scandium hydroxide;

The compound of described rare-earth europium is the one in europium sesquioxide, europium carbonate, europium nitrate, oxalic acid europium, phosphoric acid europium and europium hydroxide;

The compound of described rare earth lutetium is the one in lutecium oxide, carbonic acid lutetium, lutecium nitrate, oxalic acid lutetium, lutetium and hydroxide lutetium;

The compound of described calcium is the compound that the mass percent of calcium oxide is greater than 45%, and the mineral of calcic are the one in limestone, aragonite, lime feldspar, calcite, rhombspar and chalk rock;

The compound of described silicon is the compound that the mass percent of silicon oxide is greater than 35%, and siliceous mineral are the one in kaolin, diopside, montmorillonite, pyrophyllite, talcum and serpentine;