CN103319181A - Method for producing low-cost silicon nitride ceramic - Google Patents
Method for producing low-cost silicon nitride ceramic Download PDFInfo
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- CN103319181A CN103319181A CN2013102415724A CN201310241572A CN103319181A CN 103319181 A CN103319181 A CN 103319181A CN 2013102415724 A CN2013102415724 A CN 2013102415724A CN 201310241572 A CN201310241572 A CN 201310241572A CN 103319181 A CN103319181 A CN 103319181A
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Abstract
The invention discloses a method for producing a silicon nitride ceramic through hot pressed sintering. The method is characterized in that raw materials of the silicon nitride ceramic comprises the following components in percentage by mass: 6-9% of monazite and 91-94% of silicon nitride, wherein the monazite comprises ingredients including cerium oxide and lanthanum oxide, and the mass percentage content of the cerium oxide and lanthanum oxide in the monazite is greater than 65%; the mass percentage content of alpha-phase silicon nitride in the silicon nitride is greater than 94%; the particle size of the monazite is 1-5 microns, and the particle size of the silicon nitride is 0.4-0.7 micron; and the components are mixed together to prepare a blank, and the obtained blank is subjected to hot pressed sintering in a nitrogen atmosphere, wherein the sintering temperature is 1600-1650 DEG C, the soaking time is 1-1.5 hours, and the pressure is 12MPa. Because the monazite is used as a sintering aid in the method, the price is low, and the sintering temperature is lower, so that the energy consumption is reduced, and the comprehensive effect of the method is that the production cost is reduced. The silicon nitride ceramic produced by the method is high in compactness and good in mechanical properties.
Description
Technical field
The present invention relates to a kind of technical field of ceramic material, be specifically related to a kind of method of low cost production silicon nitride ceramics.
Background technology
Silicon nitride ceramics as one of high-temperature structural ceramics important member, have more excellent mechanical property, thermal property, chemical stability and anti-nonferrous metal melts aggressiveness than other high-temperature structural ceramics such as oxide ceramics, carbide ceramics etc., be considered to have most in the high-temperature structural ceramics material of development potentiality.
The preparation silicon nitride ceramics methods such as sintering, pressureless sintering, gas pressure sintering and hot pressed sintering that usually respond, wherein the hot pressed sintering densification degree is high, and mechanical property is good, and reliability is high.Because silicon nitride ceramics is the covalent linkage compound, densification degree is low during sintering, improve the density of silicon nitride ceramics and improve the study hotspot that mechanical property becomes the ceramist, usually add the sintering aid that contains the rare-earth oxidation yttrium, but yttrium oxide is expensive, increased cost, unfavorable for the application of silicon nitride ceramics.Select suitable sintering aid most important to the development of silicon nitride ceramics for this reason.Usually contain the firing temperature of sintering aid of rare-earth oxidation yttrium greater than 1750 ℃, temperature is high, and energy consumption is large.By adjusting sintering aid, reduce sintering temperature, can further reduce production costs.
Find through the literature search to prior art, Liu Xiaoguang etc. have delivered " hot pressed sintering Si in " Rare Metals Materials and engineering " (2007,36 volume supplementary issues, 369-372 page or leaf)
3N
4-Y
2O
3-La
2O
3The research of stupalith ", concrete grammar is: adopt Y
2O
3And La
2O
3As sintering aid, 1820 ℃ of sintering temperatures, soaking time 4h, pressure 21950N.The weak point of the method is: used expensive rare earth oxide Y
2O
3And La
2O
3As sintering aid, and firing temperature is high, and cost is higher.Also find by literature search, publication number is that the Chinese patent of CN85100510 discloses a kind of interpolation yttrium oxide, lanthanum trioxide and aluminum oxide as sintering aid, preferential sintering temperature of recommending is 1750～1840 ℃, adopts hot-pressing sintering technique to prepare the method for silicon nitride ceramics.The method still adopts the sintering aid that contains yttrium oxide, and temperature is still higher.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, provide a kind of production method simple, the method that the hot pressed sintering that cost is low is produced silicon nitride ceramics.
The technical problem that will solve required for the present invention can be achieved through the following technical solutions:
A kind of hot pressed sintering is produced the method for silicon nitride ceramics, it is characterized in that, described each component of silicon nitride ceramics starting material and mass percentage content are: monazite 6～9%, silicon nitride 91%～94%.The composition of above-mentioned each component is respectively: cerium oxide and lanthanum trioxide mass percentage content are greater than 65% in the monazite, and α phase silicon nitride mass percentage content is greater than 94% in the silicon nitride.The particle diameter of above-mentioned each component is respectively: monazite 1～5 μ m, silicon nitride 0.4～0.7 μ m mixes base with above-mentioned each component, with gained base substrate hot pressed sintering under nitrogen atmosphere.
Sintering temperature is 1600～1650 ℃, soaking time 1～1.5h, pressure 12MPa.
Because as additive, sintering temperature is lower, has reduced production cost with monazite in the present invention.The silicon nitride ceramics compactness extent that the present invention produces is high, and mechanical property is good.
Embodiment
For technique means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand; elaborate below in conjunction with embodiments of the invention: the present embodiment is implemented under take technical solution of the present invention as prerequisite; provided detailed embodiment and process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1:
Each component and mass percentage content are: monazite 8%, and silicon nitride 92%, the particle diameter of each component is respectively: monazite 1～5 μ m, silicon nitride 0.4～0.7 μ m, 1600 ℃ of sintering temperatures, soaking time 1h, pressure 12MPa.
The volume density of the silicon nitride ceramics that the present embodiment obtains is 3.25g/cm
3, folding strength is 770MPa.
Embodiment 2:
Each component and mass percentage content are: monazite 6%, and silicon nitride 93%, the particle diameter of each component is respectively: monazite 1～5 μ m, silicon nitride 0.4～0.7 μ m, 1650 ℃ of sintering temperatures, soaking time 1.5h, pressure 12MPa.
The volume density of the silicon nitride ceramics that the present embodiment obtains is 3.21g/cm
3, folding strength is 750MPa.
Embodiment 3:
Each component and mass percentage content are: monazite 9%, and silicon nitride 91%, the particle diameter of each component is respectively: monazite 1～5 μ m, silicon nitride 04～0.7 μ m, 1600 ℃ of sintering temperatures, soaking time 1h, pressure 12MPa.
The volume density of the silicon nitride ceramics that the present embodiment obtains is 3.27g/cm
3, folding strength is 780MPa.
Above demonstration and described ultimate principle of the present invention, 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 describes in above-described embodiment and the specification sheets just illustrates principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, 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 (2)
1. a hot pressed sintering is produced the method for silicon nitride ceramics, it is characterized in that, described each component of silicon nitride ceramics starting material and mass percentage content are: monazite 6～9%, silicon nitride 91%～94%, the composition of above-mentioned each component is respectively: cerium oxide and lanthanum trioxide mass percentage content are greater than 65% in the monazite, α phase silicon nitride mass percentage content is greater than 94% in the silicon nitride, the particle diameter of above-mentioned each component is respectively: monazite 1～5 μ m, silicon nitride 0.4～0.7 μ m, above-mentioned each component is mixed base, with gained base substrate hot pressed sintering under nitrogen atmosphere.
2. the method for the silicon nitride ceramics of hot pressed sintering production according to claim 1 is characterized in that, sintering temperature is 1600～1650 ℃, soaking time 1～1.5h, pressure 12MPa.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108484152A (en) * | 2018-03-26 | 2018-09-04 | 南通贝卡迪电力科技有限公司 | A kind of high-strength composite electric ceramic formulation |
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| CN1993442A (en) * | 2004-07-29 | 2007-07-04 | 3M创新有限公司 | Ceramics and methods of making and using the same |
| CN102190298A (en) * | 2010-03-19 | 2011-09-21 | 北京林业大学 | Method for preparing active carbon from carbon byproduct in fast pyrolysis of forest remainder |
| CN102557652A (en) * | 2010-12-29 | 2012-07-11 | 苏州中锆新材料科技有限公司 | Preparation method for special silicon nitride ceramic compounded by cerium oxide |
| CN102557662A (en) * | 2010-12-29 | 2012-07-11 | 苏州中锆新材料科技有限公司 | Method for preparing nano rare-earth lanthanum-cerium oxide composite nano-silicon nitride |
-
2013
- 2013-06-18 CN CN2013102415724A patent/CN103319181A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1993442A (en) * | 2004-07-29 | 2007-07-04 | 3M创新有限公司 | Ceramics and methods of making and using the same |
| CN102190298A (en) * | 2010-03-19 | 2011-09-21 | 北京林业大学 | Method for preparing active carbon from carbon byproduct in fast pyrolysis of forest remainder |
| CN102557652A (en) * | 2010-12-29 | 2012-07-11 | 苏州中锆新材料科技有限公司 | Preparation method for special silicon nitride ceramic compounded by cerium oxide |
| CN102557662A (en) * | 2010-12-29 | 2012-07-11 | 苏州中锆新材料科技有限公司 | Method for preparing nano rare-earth lanthanum-cerium oxide composite nano-silicon nitride |
Non-Patent Citations (2)
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| 刘晓光等: "热压烧结Si_3N_4-Y_2O_3-La_2O_3陶瓷材料的研究", 《稀有金属材料与工程》 * |
| 王正军: "氮化硅陶瓷的研究进展", 《材料科学与工艺》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108484152A (en) * | 2018-03-26 | 2018-09-04 | 南通贝卡迪电力科技有限公司 | A kind of high-strength composite electric ceramic formulation |
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Application publication date: 20130925 |