CN102531619A - Preparation method for high-performance yttrium oxide composite silicon nitride ceramic - Google Patents
Preparation method for high-performance yttrium oxide composite silicon nitride ceramic Download PDFInfo
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- CN102531619A CN102531619A CN2010106010460A CN201010601046A CN102531619A CN 102531619 A CN102531619 A CN 102531619A CN 2010106010460 A CN2010106010460 A CN 2010106010460A CN 201010601046 A CN201010601046 A CN 201010601046A CN 102531619 A CN102531619 A CN 102531619A
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- silicon nitride
- yttrium oxide
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- high performance
- oxide composite
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Abstract
The invention relates to the technical field of ceramic materials, in particular to a method for producing high-performance silicon nitride (Si3N4) ceramic by taking yttrium oxide (Y2O3) as an additive through pressureless sintering. The ceramic comprises the following components in percentage by mass: 8-15 percent of yttrium oxide and 85-92 percent of silicon nitride. The invention aims to overcome the defects in the prior art and provide the method for producing the high-performance silicon nitride ceramic by taking the yttrium oxide as the additive through pressureless sintering; and the method can be widely applied to preparing parts in the fields of chemical industry, mechanics, metallurgy, aerospace and the like.
Description
[technical field]
The present invention relates to a kind of technical field of ceramic material, specifically is a kind of yttrium oxide (Y
2O
3) as additive pressureless sintering production high-performance silicon nitride (Si
3N
4) ceramic method.
[background technology]
Silicon nitride ceramics has excellent mechanical behavior under high temperature, is acknowledged as one of the most rising high temperature resistant structure ceramics.Silicon nitride is as a kind of covalent linkage platform thing, and spread coefficient is little, does not have fusing point, decomposes ammonification and silicon about 2173K, is difficult to sintering.Common silicon nitride ceramics respond sintering and hot pressed sintering, the reaction sintering density is poor, poor mechanical property, though hot pressed sintering density is high, mechanical property is good, cost is higher, is difficult to scale operation.And pressureless sintering falls between, because silicon nitride ceramics is the covalent linkage compound, and the pressureless sintering difficulty, the density that improves the pressureless sintering silicon nitride ceramics becomes the research focus, adds rare earth oxide usually as sintering aid, like iridium oxide.But the cost of iridium oxide is higher, and is unfavorable for the application of silicon nitride.We select for use yttrium oxide as sintered density and the mechanical property of additive to improve silicon nitride for this reason.
[summary of the invention]
The objective of the invention is to overcome the deficiency of prior art, the method for a kind of yttrium oxide as additive pressureless sintering production high-performance silicon nitride ceramics is provided.Working method of the present invention is simple, and cost is low, is prone to realize industrialization production; The silicon nitride ceramics that yttrium oxide of the present invention is produced as additive pressureless sintering has the density height, the characteristics that mechanical property is good.
The present invention realizes through following technical scheme:
The silicon nitride ceramics that yttrium oxide involved in the present invention is produced as additive pressureless sintering, component and mass percentage content are: yttrium oxide 8%～15%, silicon nitride 85%～92%.
5～7 microns of described yttrium oxide granularities, 0.4～0.7 micron of silicon nitride granularity.
The silicon nitride ceramics method that yttrium oxide involved in the present invention is produced as additive pressureless sintering comprises the steps:
Step 1 takes by weighing yttrium oxide and silicon nitride ceramics powder respectively, in planetary ball mill, changes mixing 2 hours with PM 270～330; Dispersion medium is an absolute ethyl alcohol; 60 ℃ of oven dry, the time is 2～3 hours subsequently, yttrium oxide that obtains mixing and silicon nitride ceramics mixed powder;
Step 2 at 75～100Mpa forming under the pressure, forms biscuit with the mixed powder of step 1;
Step 3, with the biscuit in the step 2 in vacuum carbon tube furnace under nitrogen protection, under 1400～1550 ℃ of temperature, be incubated 12～18 hours.
Step 4 is taken out the silicon nitride ceramics that burns till in the step 3 detection volume density and mechanical property.
In the step 1, the weight percent of said yttrium oxide is 8%～15%, and the weight percent of silicon nitride is 85%～92%.
In the step 1, α-Si in the said silicon nitride
3N
4Content is greater than 90%.
In the step 1, Y in the said yttrium oxide
2O
3Content is greater than 98%.
In the step 3, said nitrogen gas pressure is 1～2 normal atmosphere.
In the step 4, said mechanical property is a folding strength.
Among the present invention, described yttrium oxide plays the effect of sintering aid, under 1400～1550 ℃ of high temperature sintering conditions, forms liquid phase, makes the silicon nitride ceramics densification.
The present invention has following beneficial effect: the silicon nitride ceramics compactness extent is high, and mechanical property is good, satisfies the actual needs that use.This preparation method is simple, and cost is low, is prone to realize industrialization production.
[embodiment]
Below in conjunction with embodiment the present invention is described further.Production technology of the present invention is to implement easily to this professional people.Present embodiment provided detailed embodiment and process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technical scheme of the present invention.The experimental technique of unreceipted actual conditions in the following example, usually according to normal condition, or the condition of advising according to manufacturer.
Embodiment
Yttrium oxide is Ganzhou Jiarun novel material ltd, and silicon nitride powder is the M11 powder that German Starck company produces.Take by weighing 8% yttrium oxide and 92% silicon nitride powder respectively according to weight percent.
Above-mentioned two kinds of powder (QM-3SP2 of Nanjing Univ. Instrument Factory type) in planetary ball mill are mixed, and rotating speed 300 changes 1.5 hours time.With the forming under the pressure of powder mix, biscuit (the flourish electric furnace ZT-40-20 of ltd of Shanghai occasion type) 1450 ℃ in vacuum carbon tube furnace is incubated 16 hours at 80Mpa.
The volume density of the silicon nitride ceramics that present embodiment obtains is 3.14g/cm
3, folding strength is 626Mpa.
Claims (7)
1. the silicon nitride ceramics produced as additive pressureless sintering of the related yttrium oxide of the preparation method of high performance yttrium oxide composite silicon nitride pottery, component and mass percentage content are: yttrium oxide 8%～15%, silicon nitride 85%～92%.5～7 microns of described yttrium oxide granularities, 0.4～0.7 micron of silicon nitride granularity.
2. the silicon nitride ceramics method that the related yttrium oxide of the preparation method of a kind of high performance yttrium oxide composite silicon nitride pottery according to claim 1 is produced as additive pressureless sintering comprises the steps:
Step 1 takes by weighing yttrium oxide and silicon nitride ceramics powder respectively, in planetary ball mill, changes mixing 2 hours with PM 270～330; Dispersion medium is an absolute ethyl alcohol; 60 ℃ of oven dry, the time is 2～3 hours subsequently, yttrium oxide that obtains mixing and silicon nitride ceramics mixed powder;
Step 2 at 75～100Mpa forming under the pressure, forms biscuit with the mixed powder of step 1;
Step 3, with the biscuit in the step 2 in vacuum carbon tube furnace under nitrogen protection, under 1400～1550 ℃ of temperature, be incubated 12～18 hours.
Step 4 is taken out the silicon nitride ceramics that burns till in the step 3 detection volume density and mechanical property.
3. the preparation method of a kind of high performance yttrium oxide composite silicon nitride pottery according to claim 2, the weight percent that it is characterized in that yttrium oxide described in the step 1 is 8%～15%, the weight percent of silicon nitride is 85%～92%.
4. the preparation method of a kind of high performance yttrium oxide composite silicon nitride pottery according to claim 2 is characterized in that in the step 1 α-Si in the said silicon nitride
3N
4Content is greater than 90%.
5. the preparation method of a kind of high performance yttrium oxide composite silicon nitride pottery according to claim 2 is characterized in that in the step 1 Y in the said yttrium oxide
2O
3Content is greater than 98%.
6. the preparation method of a kind of high performance yttrium oxide composite silicon nitride pottery according to claim 2 is characterized in that in the step 3 that said nitrogen gas pressure is 1～2 normal atmosphere.
7. the preparation method of a kind of high performance yttrium oxide composite silicon nitride pottery according to claim 2 is characterized in that in the step 4 that said mechanical property is a folding strength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106010460A CN102531619A (en) | 2010-12-20 | 2010-12-20 | Preparation method for high-performance yttrium oxide composite silicon nitride ceramic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106010460A CN102531619A (en) | 2010-12-20 | 2010-12-20 | Preparation method for high-performance yttrium oxide composite silicon nitride ceramic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102531619A true CN102531619A (en) | 2012-07-04 |
Family
ID=46339813
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| CN2010106010460A Pending CN102531619A (en) | 2010-12-20 | 2010-12-20 | Preparation method for high-performance yttrium oxide composite silicon nitride ceramic |
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|---|---|
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2010
- 2010-12-20 CN CN2010106010460A patent/CN102531619A/en active Pending
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Addressee: Suzhou zirconium new Mstar Technology Ltd Lu Shuping Document name: Notification of Publication of the Application for Invention |
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| DD01 | Delivery of document by public notice |
Addressee: Lu Shuping Document name: Notification of before Expiration of Request of Examination as to Substance |
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Application publication date: 20120704 |