CN101391887A

CN101391887A - Low-temperature 99% Al2O3 porcelain powder

Info

Publication number: CN101391887A
Application number: CNA2008100500079A
Authority: CN
Inventors: 黄超; 张莎莎; 朱宁宁
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-06-11
Filing date: 2008-06-11
Publication date: 2009-03-25

Abstract

The invention provides 99 percent low temperature AI2O3 ceramic powder, and according to weight percentage, the ceramic powder consists of the following components: 98.5 percent to 99.5 percent of Alpha-AI2O3, 0.1 percent to 0.5 percent of MgCO3, 0.1 percent to 0.2 percent of Y2O3, 0.2 percent to 0.6 percent of La2O3, and 0.1 percent to 0.2 percent of ZrO2; the purity of the Alpha-AI2O3 is more than or equal to 99.8 percent, and the average grain size thereof is 1 to 2 Mum; the purity of the Y2O3 is more than or equal to 99.999 percent; the purity of the La2O3 is more than or equal to 99.99 percent; the adoption of the 99 percent low temperature AI2O3 ceramic powder of the invention can reduce the sintering temperature of AI2O3 ceramics, improve the baking density of the AI2O3 ceramics, and is beneficial to energy conservation and emission reduction.

Description

99% low temperature AI 2O 3The porcelain powder

Technical field

The present invention relates to a kind of Al ₂O ₃The raw materials for sintering of pottery specifically, has related to a kind of 99% low temperature AI ₂O ₃The porcelain powder.

Background technology

Al ₂O ₃Pottery is a kind of new material that chemical property is the most stable in the oxide, mechanical strength is the highest, and its advantage is: possess excellent high-temperature mechanical property, and resistance to chemical attack, high temperature oxidation resisting, wear-resistant, proportion little (be about metal 1/3); Thereby, Al ₂O ₃Pottery replaces expensive superelevation steel alloy gradually in many occasions, or is applied at all incompetent occasion of metal material, such as air cylinder sleeve of engine, bearing shell, sealing ring, weaving wear part, ceramic cutter etc.; In addition, Al ₂O ₃Pottery has excellent electrical insulation capability and the lower advantages such as dielectric loss, thereby, very wide application is also being arranged aspect electronics, the electrical equipment, nowadays, Al ₂O ₃Pottery has been widely used in the industries such as electronics, electrical equipment, machinery, chemical industry, weaving, metallurgy, medical treatment and Aero-Space.

Because Al ₂O ₃Fusing point causes Al up to 2050 ℃ ₂O ₃The sintering temperature of pottery is generally higher, therefore, how can under the prerequisite that does not affect ceramic performance, reduce Al ₂O ₃The sintering temperature of pottery cuts down the consumption of energy, and shortens its firing period, reduces kiln and kiln furnitures loss, reduce production costs thereby reach, and concerning the ceramic producer of major part, be urgent problem.

Scientific Development Concept, cuts down the consumption of energy at energy-saving and emission-reduction, and building a conservation-minded society is the new demand that the 17th Session of the General Assembly proposes, and present domestic electric power, iron and steel, smelting industry etc. all fall behind equipment and process eliminating, the Push Technology progress, and the paces of energy-saving and emission-reduction are walked faster and faster; Al ₂O ₃Ceramic industry exists equally that technical matters is backward, energy resource consumption is high and problem that economic benefit is low, is badly in need of solving ceramic production technology, being lowered into the porcelain temperature, obtains the high-performance porcelain body, will at first pick up from raw material, makes novel synthesize ceramic material.

At these problems, people are seeking a kind of ideal technical solution always.

Summary of the invention

The objective of the invention is for the deficiencies in the prior art, thereby a kind of Al of reduction is provided ₂O ₃Ceramic sintering temperature, can improve Al ₂O ₃Pottery burns till density, is beneficial to 99% low temperature AI of energy-saving and emission-reduction ₂O ₃The porcelain powder.

To achieve these goals, the invention provides a kind of 99% low temperature AI ₂O ₃The porcelain powder, by weight percentage, this porcelain powder is composed of the following components: α-Al ₂O ₃98.5%～99.5%, MgCO ₃0.1%～0.5%, Y ₂O ₃0.1%～0.2%, La ₂O ₃0.2%～0.6%, ZrO ₂0.1%～0.2%.

Based on above-mentioned, a kind of 99% low temperature AI ₂O ₃The porcelain powder, by weight percentage, this porcelain powder is composed of the following components: α-Al ₂O ₃99%, MgCO ₃0.38%, Y ₂O ₃0.13%, La ₂O ₃0.35%, ZrO ₂0.14%.

Based on above-mentioned, described α-Al ₂O ₃Purity 〉=99.8%, its average grain diameter 1～2 μ m, described Y ₂O ₃Purity 〉=99.999%; Described La ₂O ₃Purity 〉=99.99%.

99% low temperature AI of the present invention ₂O ₃The porcelain powder is on the basis of comprehensive in the industry advanced prescription and is prepared by repeated experiments that its relative prior art has outstanding substantive distinguishing features and significant progressive, specifically, and this 99% low temperature AI ₂O ₃The porcelain powder has following advantage:

1, adopts closed ceramic ball mill mixed grinding, can be the complicated blending process of ceramic producer's cancellation;

2, this product is fit to different process, and being used for injection moulding technology can be directly and the wax use, but for the granulation of isostatic pressing process Direct spraying;

3, its firing temperature is compared with similar one-tenth ceramic material, can reduce by 100 ℃～150 ℃, can be evident as the every power consumption in the Production of Ceramics producer minimizing production process, prolongs the work-ing life of kiln kiln furnitures, and producer reduces production costs for Production of Ceramics;

4, compare with similar one-tenth ceramic material, every performance index all are higher than the national standard of corresponding porcelain kind; As: this porcelain powder firing temperature is at 1600 ℃～1630 ℃ * 2.5h, and shrinking percentage is 16%～18%, and stable, burns till density 〉=3.90cm ³, crystal-size distribution (CSD) is even, and the weak breath hole is the desirable feedstock of producing 99 porcelain.

Embodiment

Below by embodiment, technical scheme of the present invention is described in further detail.

Embodiment 1

A kind of 99% low temperature AI ₂O ₃The porcelain powder, by weight percentage, this porcelain powder is composed of the following components: α-Al ₂O ₃99%, MgCO ₃0.38%, Y ₂O ₃0.13%, La ₂O ₃0.35%, ZrO ₂0.14%.

Based on above-mentioned, described α-Al ₂O ₃Purity 〉=99.8%, its average grain diameter 1～2 μ m, the original grain size is evenly rationally amassed and is joined; Described Y ₂O ₃Purity 〉=99.999%; Described La ₂O ₃Purity 〉=99.99%.

At α-Al ₂O ₃The carbonate that adds Mg during ball milling; Add rare earth as the compound thermal stabilization aid; Oxide Y ₂O ₃, La ₂O ₃, ZrO ₂Can improve ceramic performance as auxiliary material.

With α-Al ₂O ₃Be raw material, according to Al ₂O ₃The characteristic such as wear-resisting, corrosion-resistant that pottery has is added relevant specific form flux and auxiliary material, and grind, mix by closed ceramic ball mill, and control Al ₂O ₃Content and synthesis temperature, so obtain a kind of firing temperature low, burn till the high synthetic low temperature AI of density ₂O ₃The porcelain powder.

Embodiment 2

The main distinction of present embodiment and embodiment 1 is: a kind of 99% low temperature AI ₂O ₃The porcelain powder, by weight percentage, this porcelain powder is composed of the following components: α-Al ₂O ₃98.8%, MgCO ₃0.4%, Y ₂O ₃0.18%, La ₂O ₃0.44%, ZrO ₂0.18%.

Embodiment 3

The main distinction of present embodiment and embodiment 1 is: a kind of 99% low temperature AI ₂O ₃The porcelain powder, by weight percentage, this porcelain powder is composed of the following components: α-Al ₂O ₃99.3%, MgCO ₃0.15%, Y ₂O ₃0.15%, La ₂O ₃0.25%, ZrO ₂0.15%.

In order to realize Al ₂O ₃The pottery low-temperature sintering technology, the invention provides a kind of can be at the Al of sintering under the cryogenic conditions ₂O ₃The porcelain powder, its technical scheme is concluded, and realizes by following three aspects::

1, Raw material processing: at Al ₂O ₃In the ceramic low-temp sintering technology, by improving Al ₂O ₃The fineness of material powder can reach and reduce Al with active ₂O ₃The firing temperature of pottery; Thereby, should select the Al of purity height, active good, easy-sintering ₂O ₃Powder is made raw material, i.e. Al ₂O ₃The particle of powder is more thin more good, and level of activity is more high more good, and so, porcelain body is more easy sintering just, and sintering temperature is also just more low;

Therefore, adopt mechanical ball-milling method to grind, and in ball mill liner aluminium oxide ceramic tile, guarantee not mix in the mechanical milling process other impurity.

2, prescription forms: Al ₂O ₃The sintering temperature of pottery is mainly by Al ₂O ₃Content determine Al ₂O ₃Content is more high, Al ₂O ₃The sintering temperature of pottery is more high;

In addition, also relevant with composition and ratio and the additive kind of porcelain powder, at Al ₂O ₃When content is suitable, add oxide M g element, by certain composition, make it have lower sintering temperature and good performance;

Simultaneously, in composition, introduce a spot of rare oxide compound, further reduce sintering temperature, and improve heterogeneous microstructure and its performance of porcelain spare;

In addition, guarantee ceramic mass, satisfying under the prerequisite of product application target and specification requirement, forming by prescription, selecting rational porcelain, is adding the suitable burning additive that helps, thus reduction Al ₂O ₃The sintering temperature of pottery.

3, sintering process: at present, also can reduce the porcelain piece sintering temperature by special firing process, and adopt low temperature AI of the present invention ₂O ₃The porcelain powder can be under normal pressure, finish in the ordinary sinter atmosphere; In production practices, for obtaining best comprehensive benefit, can combine with some low-temperature sintering technologies, to obtain better economic benefit.

Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or the part technical characterictic is equal to replacement the specific embodiment of the present invention; And not breaking away from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.

Claims

1, a kind of 99% low temperature AI ₂O ₃The porcelain powder is characterized in that, by weight percentage, this porcelain powder is composed of the following components: α-Al ₂O ₃98.5%～99.5%, MgCO ₃0.1%～0.5%, Y ₂O ₃0.1%～0.2%, La ₂O ₃0.2%～0.6%, ZrO ₂0.1%～0.2%.

2,99% low temperature AI according to claim 1 ₂O ₃The porcelain powder is characterized in that, by weight percentage, this porcelain powder is composed of the following components: α-Al ₂O ₃99%, MgCO ₃0.38%, Y ₂O ₃0.13%, La ₂O ₃0.35%, ZrO ₂0.14%.

3,99% low temperature AI according to claim 1 and 2 ₂O ₃The porcelain powder is characterized in that: described α-Al ₂O ₃Purity 〉=99.8%, its average grain diameter 1～2 μ m; Described Y ₂O ₃Purity 〉=99.999%; Described La ₂O ₃Purity 〉=99.99%.