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Method for preparing silicon nitride particulate filter

A particle trap and silicon nitride technology, applied in the field of particle traps, can solve the problems of low proportion and the inability to maximize the performance of silicon nitride, so as to reduce emissions, improve fuel economy, The effect of small pressure drop

Inactive Publication Date: 2011-09-07
无锡清源数字信息技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the nitriding reaction is difficult to complete in the later stage, the rod-like β-Si in this DPF 3 N 4 The proportion of crystal grains is not high, so many excellent properties of silicon nitride cannot be fully reflected
At present, silicon nitride DPF prepared by Si powder nitriding has no commercial application

Method used

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  • Method for preparing silicon nitride particulate filter

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Experimental program
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Effect test

Embodiment 1

[0025] Embodiment 1: A method for preparing a particle trap made of silicon nitride, the proportion of its components is calculated in parts by weight, including the following process steps:

[0026] (1) 95 parts of silicon nitride with a purity of 90% and an average particle size of 2 microns and 5 parts of sintering aid Y 2 o 3 Mix to obtain mixed powder;

[0027] (2) Add 5 parts of binder methylcellulose, 20 parts of water and 1 part of lubricant soybean oil successively in the mixed powder that step (1) obtains, carry out stirring mud and obtain the mud material with plasticity, so Said stirring speed is 20 revs / min, and the stirring time is 0.5 hour;

[0028] (3) the mud material that step (2) is obtained is put into honeycomb ceramic mould, is extruded in extrusion machine and obtains honeycomb ceramic green body, and the extruding force of extruder is 0.5MPa; Described honeycomb ceramic green body The honeycomb density is 100 mesh / square inch;

[0029] (4) Dry the h...

Embodiment 2

[0032] Embodiment 2: A method for preparing a particle trap made of silicon nitride, the proportion of its components is calculated in parts by weight, including the following process steps:

[0033] (1) 95 parts of silicon nitride with a purity of 93% and an average particle size of 2 microns and 5 parts of sintering aid MgO are mixed to obtain a mixed powder;

[0034] (2) Add 20 parts of binding agent hydroxypropyl methylcellulose, 30 parts of water and 10 parts of lubricant castor oil successively in the mixed powder that step (1) obtains, carry out stirring mud and obtain plasticity Mud, the stirring speed is 100 rpm, and the stirring time is 1.5 hours;

[0035] (3) put the mud that step (2) obtains into the honeycomb ceramic mold, extrude and form the honeycomb ceramic green body in an extruder, and the extrusion force of the extruder is 1.5MPa; The honeycomb density is 300 mesh / square inch;

[0036] (4) Dry the honeycomb ceramic green body obtained in step (3) at 60° C...

Embodiment 3

[0039] Embodiment 3: A method for preparing a particle trap made of silicon nitride, the proportion of its components is calculated in parts by weight, including the following process steps:

[0040] (1) 98 parts of silicon nitride with a purity of 93% and an average particle size of 5 microns and 2 parts of sintering aid Y 2 o 3 Mix to obtain mixed powder;

[0041] (2) Add successively 6 parts of binder starch, 21 parts of water and 2 parts of lubricant lard to the mixed powder obtained in step (1), stir and muddy to obtain plastic mud, the stirring The speed is 30 rpm, and the stirring time is 1 hour;

[0042] (3) Put the mud material obtained in step (2) into a honeycomb ceramic mold, and extrude it in an extruder to obtain a honeycomb ceramic green body, and the extrusion force of the extruder is 1MPa; the honeycomb of the honeycomb ceramic green body The density is 120 mesh / square inch;

[0043] (4) Dry the honeycomb ceramic green body obtained in step (3) at 40° C. f...

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Abstract

The invention relates to a method for preparing a silicon nitride particulate filter, which comprises the following process steps of: (1) mixing silicon nitride and a sintering aid to obtain mixed powder; (2) sequentially adding a binder, water and a lubricant into the mixed powder, stirring and carrying out mud refining to obtain mud with plasticity; (3) placing the mud into a honeycomb ceramic die and carrying out extrusion forming in an extruding machine to obtain a honeycomb ceramic green body; (4) drying the honeycomb ceramic green body and carrying out latex drainage on the dried honeycomb ceramic green body under the air atmosphere; (5) placing the honeycomb ceramic green body subjected to latex drainage into a sintering furnace, and sintering to obtain silicon nitride honeycomb ceramic; and (6) and alternately blocking up holes at both ends of honeycomb pore passages adjacent to the silicon nitride honeycomb ceramic to obtain the silicon nitride particulate filter. By the method, the silicon nitride diesel particulate filter (DPF) with high cost performance can be prepared, the porosity of a material can be improved, the maximum gas permeability and the minimum pressure drop are obtained, and the economy of fuel oil is improved.

Description

technical field [0001] The invention relates to a particulate trap, in particular to a method for preparing a wall-flow silicon nitride particulate trap. Background technique [0002] Due to its good economy and power, diesel engines have been more and more widely used in motor vehicles in recent years. However, diesel vehicles emit a large amount of particulates and nitrogen oxides during use. The main component of particles is carbon. Due to its small particle size, it can be suspended in the air for a long time, seriously pollutes the environment, and has a strong carcinogenic effect on the human body. Therefore, many countries in the world have successively enacted laws and regulations to limit the particulate emission of diesel vehicles. Europe and the United States have implemented strict Euro V and EPA2010 emission standards for heavy-duty diesel vehicles since 2008 and 2010, respectively. [0003] Diesel particulate filter (DPF), also known as particulate filter, ...

Claims

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Application Information

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IPC IPC(8): B01D39/20C04B35/584C04B38/00C04B35/622
Inventor 姜广鹏张冠忠李荣先过增元王德保刘艳芳
Owner 无锡清源数字信息技术研究院有限公司