CN104030662A

CN104030662A - Preparation process of Al2O3-TiC multiphase ceramics

Info

Publication number: CN104030662A
Application number: CN201410214360.1A
Authority: CN
Inventors: 卢斌
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-05-20
Filing date: 2014-05-20
Publication date: 2014-09-10

Abstract

The invention discloses a preparation process of Al2O3-TiC multiphase ceramics. The preparation process comprises the following steps: (1) weighing micrometer Al2O3 powder and nanometer TiC powder according to a ratio of (1-3):(1-5); (2) ultrasonically dispersing the weighed Al2O3 powder and TiC powder for one hour in an ultrasonic cleaner in the presence of absolute ethanol serving as a dispersion medium; (3) putting the ultrasonically dispersed mixed material into a nylon ball milling tank, and performing continuous ball milling for two hours in a planetary ball mill; (4) pouring the ball-milled powder together with agate grinding balls into a powder tray and drying at the temperature of 80 DEG C; (5) sieving the dried powder, taking out the agate grinding balls and subsequently grinding the mixed powder until no large lump exist in the powder, thus finishing the preparation of the mixed powder; (6) putting the prepared mixed powder into a graphite mold cavity, firstly keeping the temperature and the pressure of 15MPa for 15 minutes at the temperature which is 200 DEG C lower than a specified sintering temperature, then heating to the temperature of 1650-1700 DEG C, performing hot pressing for one hour at the pressure of 30MPa, and finally cooling in a furnace to prepare a finished product. The preparation process disclosed by the invention is simple in method and liable to implement, and the prepared ceramics have high elasticity modulus, is unlikely to deform, good in thermal stability and stable in physical and chemical performances.

Description

Al 2o 3the preparation technology of-TiC complex phase ceramic

Technical field

The present invention relates to technical field of ceramic material, be specifically related to a kind of Al ₂o ₃the preparation technology of-TiC complex phase ceramic.

Background technology

People are generally divided into four large classes the material of applying in modern technologies: metallic substance, ceramic, macromolecular material and matrix material.Stupalith is the solid chemical compound of metal and non-metallic element as the important component part of ceramic.Pottery is generally divided into engineering structure pottery and the large class of function ceramics two.Because engineering structure pottery has a series of high-performance as high strength, high rigidity, high-wearing feature, high resistance chemical stability, particularly it at high temperature has intensity, hardness is high, and creep is little, and the high-performances such as resistance to ablation enjoy people's concern.At present, countries in the world fall over each other stupalith to study, and in aerospace, in motor car engine and war industry, have greater advance especially.Most study in the world, and think that the most rising engineering structure pottery is silicon carbide ceramics, toughness reinforcing oxide ceramics and silicon nitride ceramics three major types material.The process of complex phase-single-phase-complex phase has been passed through in the development of stupalith, and at present, complex phase ceramic is generally considered the trend of Chinaware Progression.

Another weakness of restriction Chinaware Progression is that ceramic heat-shock resistance is poor, due to fragility of pottery itself will cause its thermal shock impact and thermal fatigue property poor.Thereby, limited a lot of ceramic components and worked under hot conditions.The cutter of take is in use example, and the generation of thermal stresses is the major reason that it lost efficacy and the life-span reduces.Someone points out, use the maximum tension stress of cooled WC-Co cutter to reach 20,000MPa, and maximum crushing stress can reach 18,000MPa, and large like this thermal stresses certainly will cause the generation of thermal crack ^[5].In addition, thermal strain scope and the thermal strain cycle life WC-Co during for intermittent-cutting has great effect cutter life.People, calculate near transient temperature and the thermal stress distribution of blade during cutting with finite element method.Result shows, thermal stresses can cause that cutting tool cracks, and the strong periodical change of temperature and thermal stresses, more promotes crack propagation and causes cutter to destroy.Be intended to as can be seen here improve the important of ceramic heat-shock resistance and the necessity to its heat-shock resistance, thermal fatigue property rational evaluation.Single-phase alumina-ceramic Δ T (the anti-thermal shock temperature difference) is about 200 ℃, has limited its use under comparatively high temps, current the Study on Thermal Shock Resistance of composite ceramics is just quietly risen.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of method simple, is easy to the Al of industrial operation ₂o ₃the preparation technology of-TiC complex phase ceramic.

Technical problem to be solved by this invention realizes by the following technical solutions:

A kind of Al ₂o ₃the preparation technology of-TiC complex phase ceramic, comprises following processing step,

1) in the ratio of 1-3:1-5, take a micron Al ₂o ₃with nano TiC powder; Micron Al ₂o ₃be to buy from Shanghai the May 4th chemical reagent company limited, its purity is greater than 99.9%, is α phase substantially mutually; Nano TiC powder is buied from the safe ultrafine powder products factory of Shijiazhuang China;

2) to the Al having taken ₂o ₃take dehydrated alcohol as dispersion medium with TiC powder, and wherein the mass ratio of powder and alcohol is 1:30, and on the supersonic cleaning machine that is ZB220-T in model, ultrasonic dispersion is 1 hour;

3) compound through ultrasonic dispersion is put into nylon ball grinder, take agate ball as abrading-ball, ball material mass ratio is 7:1, is that under the condition of 150 revs/min, in the planetary ball mill that is QM-1SP in model, continuous ball milling is 2 hours at rotating speed;

4) the complete powder of ball milling is poured in powder dish together with agate abrading-ball, at 80 ℃, dried, the model of baking oven is 202-2 type;

5) powder of drying is sieved, take out agate abrading-ball, then powder mix is ground, until without larger reunion, so far, the preparation of mixed powder is complete;

6) compound preparing is packed in graphite jig die cavity, first at the front 200 ℃ of heat-insulation pressure keeping 15min of determined sintering temperature, now pressure is 15MPa, is then warming up to 1650-1700 ℃, under the pressure of 30MPa, and hot pressing 1 hour, last furnace cooling; Wherein heat-up rate is 30 ℃/min, and cooling rate is 20 ℃/min, passes into the nitrogen (or 1atm argon gas) of 1atm as protective atmosphere in stove, and the purity of nitrogen is 99.6%.

The invention has the beneficial effects as follows: the inventive method is simple, easy to implement, the pottery of preparation have Young's modulus greatly, not yielding, Heat stability is good, physical and chemical performance is stable, high temperature oxidation resistance is strong and lightweight, lower-price characteristic, can be widely used on engineering component, as high-temperature wearable part, mechanical sealing member, high temperature heating element, sparking plug, the lighter for ignition more controlled than resistance, cutting tool etc.

Embodiment

For technique means, creation characteristic that the present invention is realized, reach object and effect is easy to understand, below in conjunction with specific embodiment, further set forth the present invention.

Embodiment 1

More than show and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and specification sheets, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.

Claims

1. an Al ₂o ₃the preparation technology of-TiC complex phase ceramic, is characterized in that: comprise following processing step,

1) in the ratio of 1-3:1-5, take a micron Al ₂o ₃with nano TiC powder;

2) to the Al having taken ₂o ₃take dehydrated alcohol as dispersion medium with TiC powder, and wherein the mass ratio of powder and ethanol is 1:30, and on supersonic cleaning machine, ultrasonic dispersion is 1 hour;

3) compound through ultrasonic dispersion is put into nylon ball grinder, take agate ball as abrading-ball, ball material mass ratio is 7:1, is that under the condition of 150 revs/min, in planetary ball mill, continuous ball milling is 2 hours at rotating speed;

4) the complete powder of ball milling is poured in powder dish together with agate abrading-ball, at 80 ℃, dried;

6) compound preparing is packed in graphite jig die cavity, first at the front 200 ℃ of heat-insulation pressure keeping 15min of determined sintering temperature, now pressure is 15MPa, then be warming up to 1650-1700 ℃, under the pressure of 30MPa, hot pressing 1 hour, last furnace cooling can make finished product.

2. Al according to claim 1 ₂o ₃the preparation technology of-TiC complex phase ceramic, is characterized in that: step 6 wherein) in heat-up rate be 30 ℃/min, cooling rate is 20 ℃/min, passes into the nitrogen of 1atm or 1atm argon gas as protective atmosphere in stove, the purity of nitrogen is 99.6%.