CN102775150A - Production process for rare earth yttrium lanthanum composite silicon nitride ceramic - Google Patents
Production process for rare earth yttrium lanthanum composite silicon nitride ceramic Download PDFInfo
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- CN102775150A CN102775150A CN2011101186998A CN201110118699A CN102775150A CN 102775150 A CN102775150 A CN 102775150A CN 2011101186998 A CN2011101186998 A CN 2011101186998A CN 201110118699 A CN201110118699 A CN 201110118699A CN 102775150 A CN102775150 A CN 102775150A
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- yttrium oxide
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Abstract
The invention relates to the technical field of ceramic materials and specifically to a method for producing a high performance silicon nitride (Si3N4) ceramic through pressureless sintering by using lanthanum oxide and yttrium oxide as additives. The ceramic comprises the following components expressed in mass percent: 3 to 7% of lanthanum oxide, 5 to 8% of yttrium oxide and 85 to 92% of silicon nitride. The objective of the invention is to provide the method for producing the high performance silicon nitride ceramic through pressureless sintering by using lanthanum oxide and yttrium oxide as the additives to overcome disadvantages in the prior art, and the prepared ceramic can be extensively used for preparation of components and parts used in fields like the chemistry industry, machinery, metallurgy and the aerospace industry.
Description
[technical field]
The present invention relates to a kind of technical field of ceramic material, specifically is the method for a kind of lanthanum trioxide yttrium oxide as additive pressureless sintering production high-performance silicon nitride ceramics.
[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 the lanthanum trioxide 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 lanthanum trioxide 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 lanthanum trioxide 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 lanthanum trioxide yttrium oxide involved in the present invention is produced as additive pressureless sintering, component and mass percentage content are: lanthanum trioxide 3%～7%, yttrium oxide 5%～8%, silicon nitride 85%～92%.
3～6 microns of described lanthanum trioxide granularities, 5～7 microns of yttrium oxide granularities, 0.4～0.7 micron of silicon nitride granularity.
The silicon nitride ceramics method that lanthanum trioxide yttrium oxide involved in the present invention is produced as additive pressureless sintering comprises the steps:
Step 1; Take by weighing lanthanum trioxide yttrium oxide and silicon nitride ceramics powder respectively; In planetary ball mill, change mixing 2 hours with PM 270～330, dispersion medium is an absolute ethyl alcohol, subsequently 60 ℃ of oven dry; Time is 2～3 hours, lanthanum trioxide 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 lanthanum trioxide is 3%～7%, and the weight percent of yttrium oxide is 5%～8%, 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, said lanthanum trioxide yttrium oxide content is all 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 lanthanum trioxide 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
The lanthanum trioxide yttrium oxide is Ganzhou Jiarun novel material ltd, and silicon nitride powder is the M11 powder that German Starck company produces.Take by weighing 3% lanthanum trioxide, 5% 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 3.34g/cm
3, folding strength is 691Mpa.
Claims (7)
1. the silicon nitride ceramics produced as additive pressureless sintering of the related lanthanum trioxide yttrium oxide of rare earth yttrium lanthanum composite silicon nitride ceramic production technology, component and mass percentage content are: lanthanum trioxide 3%～7%, yttrium oxide 5%～8%, silicon nitride 85%～92%.3～6 microns of described lanthanum trioxide granularities, 5～7 microns of yttrium oxide granularities, 0.4～0.7 micron of silicon nitride granularity.
2. the silicon nitride ceramics method that the related lanthanum trioxide yttrium oxide of rare earth yttrium lanthanum composite silicon nitride ceramic production technology according to claim 1 is produced as additive pressureless sintering comprises the steps:
Step 1; Take by weighing lanthanum trioxide yttrium oxide and silicon nitride ceramics powder respectively; In planetary ball mill, change mixing 2 hours with PM 270～330, dispersion medium is an absolute ethyl alcohol, subsequently 60 ℃ of oven dry; Time is 2～3 hours, lanthanum trioxide 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. rare earth yttrium lanthanum composite silicon nitride ceramic production technology according to claim 2; The weight percent that it is characterized in that lanthanum trioxide described in the step 1 is 3%～7%; The weight percent of yttrium oxide is 5%～8%, and the weight percent of silicon nitride is 85%～92%.
4. rare earth yttrium lanthanum composite silicon nitride ceramic production technology 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. rare earth yttrium lanthanum composite silicon nitride ceramic production technology according to claim 2 is characterized in that in the step 1 that content is all greater than 98% in the said lanthanum trioxide yttrium oxide.
6. rare earth yttrium lanthanum composite silicon nitride ceramic production technology according to claim 2 is characterized in that in the step 3 that said nitrogen gas pressure is 1～2 normal atmosphere.
7. rare earth yttrium lanthanum composite silicon nitride ceramic production technology according to claim 2 is characterized in that in the step 4 that said mechanical property is a folding strength.
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| CN2011101186998A CN102775150A (en) | 2011-05-10 | 2011-05-10 | Production process for rare earth yttrium lanthanum composite silicon nitride ceramic |
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| CN2011101186998A CN102775150A (en) | 2011-05-10 | 2011-05-10 | Production process for rare earth yttrium lanthanum composite silicon nitride ceramic |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112209723A (en) * | 2020-10-12 | 2021-01-12 | 衡阳凯新特种材料科技有限公司 | Grinding method of rare earth yttrium lanthanum composite silicon nitride ceramic |
-
2011
- 2011-05-10 CN CN2011101186998A patent/CN102775150A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112209723A (en) * | 2020-10-12 | 2021-01-12 | 衡阳凯新特种材料科技有限公司 | Grinding method of rare earth yttrium lanthanum composite silicon nitride ceramic |
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Application publication date: 20121114 |