CN106518007A

CN106518007A - Compression moulding method of Nixing pottery

Info

Publication number: CN106518007A
Application number: CN201610999311.2A
Authority: CN
Inventors: 钟恒成; 甘冠蓝; 孙继旋; 袁丽娟
Original assignee: Qinzhou University
Current assignee: Qinzhou University
Priority date: 2016-11-14
Filing date: 2016-11-14
Publication date: 2017-03-22

Abstract

The invention discloses a compression moulding method of Nixing pottery. The method comprises the following steps: 1) mixing eastern mud and western mud and grinding into 1-30mu m to obtain pottery clay powder; 2) grinding SnO2 into 1-30mu m, and uniformly mixing with the pottery clay powder in a weight ratio of 1:(10-15) to obtain a blank; and 3) filling the blank into a metal mould cavity, and compressing for 10-30s under 5-15KPa to obtain a moulded body. In the invention, a large quantity of free electrons can be generated by adding SnO2 into the Nixing pottery, and the free electrons wrap the blank particles so that the particle surface carries charges; the electrostatic repulsion and steric hindrance repulsion generated by negative charges are shielded by the Van der Waals force among the particles, and thus the blank particles are not agglomerated and have good fluidity; the compressed body has good uniformity and high density; and in a sintering process, the body is uniformly heated and does not crack.

Description

The briquetting process of Nixing pottery

Technical field

The present invention relates to the forming method of Nixing pottery, and in particular to the briquetting process of Nixing pottery.

Background technology

Qiezhou Nixing pottery ranks four big name pottery of China with Jiangsu's purple sand ceramics, Yunnan Jian Shui potteries, Sichuan Rongchang County pottery, enjoys great prestige At home and abroad.Nixing pottery is by Qinzhou Prefecture distinctive eastern mud and western mud as a raw material, through air slaking, ball milling, filter pressing, vacuum pugging, old Blank is made after corruption, then the technique such as Jing molding, drying, firing is made.Nixing pottery moulding process mainly adopts hand throwing, enters New forming method, i.e. the throwing method of forming, slip casting are introduced after entering semi-mechanization production, moulding moulage method, has been rolled into Type method, wherein injection forming and roll forming method use gypsum mold, and moulding moulage method makees mould using sulfur, and roll forming Method and moulding moulage method use plastic making blank, injection forming to use slip casting blank.Above-mentioned forming method is deposited In process cycle length, the defect of body drying high energy consumption.With the development of Nixing pottery industrialization, the spy to short period production technique Rope also seems important all the more.Dry-pressing formed is that one kind is simple, and intuitively forming method, pours ceramic powder the steel of definite shape into In mould, by formpiston, by impressed pressure, just can be by powder pressing into base substrate.The letter of the equipment of dry pressing, mould and technique Single, low cost, Operation and maintenance are convenient, are widely applied in Ceramic Production.Such as Publication No. The patent of invention of CN102229184A discloses a kind of Nixing pottery dry process for forming, and eastern mud and western mud are crushed to 80～120 Mesh, by 5～6：4～5 weight obtains potter's clay powder than mixing；Suitable aluminum alloy mould is selected further according to shape of product, will Aluminum alloy mould is fixed on hydraulic press, then potter's clay powder is inserted under aluminum alloy mould in the die cavity of mould, in front Pressure is compressing under 80～400 tons of pressure condition.As the granularity of potter's clay powder in the technique is 80～120 mesh, i.e., For 74～198 μm, conventional Nixing pottery blank granularity (4 μm or so) is far longer than, repulsion is larger between particle, needs larger pressure (80～400 tons) powder could be pressed into the base substrate of densification；And blank granularity it is larger can also blank mobility it is poor, compacting Even green body is poor, and in follow-up sintering procedure, sintering temperature also can be improved therewith, causes base substrate very easily to ftracture.

The content of the invention

The technical problem to be solved in the present invention is to provide a kind of briquetting process of Nixing pottery, and the technique is compressing Even green body is good, and consistency is high, is not easily susceptible to cracking during follow-up sintering.

The technical scheme that the present invention is provided is the briquetting process of Nixing pottery, is comprised the following steps：

1) eastern mud, western mud co-grinding are taken to 1～30 μm, potter's clay powder is obtained；

2) by SnO₂1～30 μm is crushed to, which is pressed into 1 with potter's clay powder：10～15 weight obtains blank than mixing；

3) blank is filled with into metal die cavity, 10～30s is suppressed under 5～15KPa, molding blank is obtained.

Step 1) in, the weight ratio of eastern mud and western mud is 4～6：4～6.Preferably, the weight ratio of eastern mud and western mud is 6：4.

Step 1) in, eastern mud, western mud co-grinding belong to the scope of superfine powder, can substantially reduce pottery to 1～30 μm Electrostatic repulsion between native powder so that potter's clay powder mixes evenly, and the mobility between powder is greatly improved, also effectively drops Low compressing pressure.Preferably, eastern mud, western mud co-grinding be to 1～10 μm, now the granularity and conventional method of blank The Nixing pottery sun-dried mud brick material for obtaining is more similar, is not easily susceptible to cracking during firing.It is further preferred that when granularity is less than 5 μm, between microgranule Reunion further increase, therefore to the east of mud, western mud co-grinding be optimal to 5～10 μm.

Step 2) in, SnO₂Belong to tetragonal crystal system, rutile structure there are 6 atoms in unit cell, wherein 2 Sn originals Son, 4 O atoms, each Sn atom is positioned at the approximate octahedral center being made up of 6 O atoms, and each O atom also is located at 3 The center of the former molecular equilateral triangles of individual Sn, forms 6:3 coordination structure.SnO₂Electronic configuration for Sn 5S²P²Formed Conduction band, the 2S of O²P⁴Valence band is formed, the 2P tracks of each O atom receive two of Sn and electronically form stable octahedron, due to Sn 5S be a broadband, so as to form SnO₂Broadband semiconductor, can electronics and hole excite, tetravalence Sn⁴⁺In replacing Nixing pottery soil Al₂O₃Al³⁺A displacement ion is formed, that is, produces a positive center, the electronics of release is exactly free electron, trip Blank microgranule is wrapped up from electrons so that microparticle surfaces are negatively charged, the electrostatic repulsion produced between negative charge and space Van der Waals force between microgranule can be shielded by steric hindrance repulsion so that blank microgranule is no longer reunited, good fluidity, and the base substrate being pressed into is equal Even property is good, and consistency is high, and in sintering process, base substrate is heated evenly, not easy to crack.

SnO₂1～30 μm is crushed to, the scope of superfine powder is fallen within, which is mixed with the potter's clay powder of same granularity, SnO can be substantially reduced₂Between powder and SnO₂Electrostatic repulsion between powder and potter's clay powder so that SnO₂Powder and pottery The blank mix homogeneously of native powder constituent, the mobility between blank are greatly improved, and effectively reduce compressing pressure.It is excellent Selection of land, SnO₂When being crushed to 1～10 μm, it is close to Nixing pottery regular particle size, easily sinters in follow-up sintering procedure.Further Preferably, when granularity is less than 5 μm, the reunion between microgranule increases, and causes base substrate mobility to reduce, therefore SnO₂It is crushed to 5～10 μm is optimal.

The present invention compared with prior art, has the advantages that：

1) eastern mud and western mud are ground into superfine powder by the present invention, the electrostatic repulsion being effectively reduced between granule, are improved Mobility between granule, the even green body of compacting are good, and consistency is high, not easy to crack in sintering process.

2) present invention adds SnO in Nixing pottery soil₂Substantial amounts of free electron can be produced, free electron is by blank microgranule bag Wrap up in so that microparticle surfaces are negatively charged, the electrostatic repulsion and sterically hindered repulsion that negative charge is produced can be by the model moral between microgranule Magnificent power shielding so that blank microgranule is no longer reunited, good fluidity, and the even green body being pressed into is good, and consistency is high, sintered In journey, base substrate is heated evenly, not easy to crack.

3)SnO₂Superfine powder is belonged to together with potter's clay powder, the electrostatic repulsion between granule, raising can be equally reduced Mobility between grain, the even green body of compacting are good, and consistency is high, not easy to crack in sintering process.

4) potter's clay powder and SnO₂Granularity belong to superfine powder scope, pressure when can substantially reduce compressing.

Specific embodiment

The present invention is further elaborated for specific examples below, but not as a limitation of the invention.

Embodiment 1

1) eastern mud, western mud are taken by 6：4 mixing, are crushed to 30 μm, obtain potter's clay powder；

2) by SnO₂30 μm are crushed to, which is pressed into 1 with potter's clay powder：10 weight obtains blank than mixing；

3) blank being filled with into metal die cavity, 30s being suppressed under 15KPa, (a diameter of 15cm is highly to obtain molding blank 30cm)。

Reference examples 1

1) eastern mud, western mud are taken by 6：4 mixing, are crushed to 30 μm, obtain blank；

2) blank being filled with into metal die cavity, 30s being suppressed under 15KPa, (a diameter of 15cm is highly to obtain molding blank 30cm)。

Reference examples 1 '

1) eastern mud, western mud are taken by 6：4 co-grindings obtain blank to 80 mesh；

2) blank being filled with into metal die cavity, 30s being suppressed under 30MPa, (a diameter of 15cm is highly to obtain molding blank 30cm)。

Reference examples 1 "

2) blank is filled with into metal die cavity, suppresses 30s under 15KPa, base substrate cannot molding (a diameter of 15cm is highly 30cm)。

Embodiment 2

1) eastern mud, western mud are taken by 6：4 mixing, are crushed to 10 μm, obtain potter's clay powder；

2) by SnO₂10 μm are crushed to, which is pressed into 1 with potter's clay powder：12 weight obtains blank than mixing；

3) blank being filled with into metal die cavity, 20s being suppressed under 10KPa, (a diameter of 15cm is highly to obtain molding blank 30cm)。

Reference examples 2

1) eastern mud, western mud are taken by 6：4 mixing, are crushed to 10 μm, obtain blank；

2) blank being filled with into metal die cavity, 20s being suppressed under 10KPa, (a diameter of 15cm is highly to obtain molding blank 30cm)。

Embodiment 3

1) eastern mud, western mud are taken by 6：4 mixing, are crushed to 5 μm, obtain potter's clay powder；

2) by SnO₂5 μm are crushed to, which is pressed into 1 with potter's clay powder：15 weight obtains blank than mixing；

3) blank being filled with into metal die cavity, 10s being suppressed under 15KPa, (a diameter of 15cm is highly to obtain molding blank 30cm)。

Reference examples 3

1) eastern mud, western mud are taken by 6：4 mixing, are crushed to 5 μm, obtain blank；

2) blank being filled with into metal die cavity, 10s being suppressed under 15KPa, (a diameter of 15cm is highly to obtain molding blank 30cm)。

Embodiment 4

1) eastern mud, western mud are taken by 6：4 mixing, are crushed to 1 μm, obtain potter's clay powder；

2) by SnO₂1 μm is crushed to, which is pressed into 1 with potter's clay powder：15 weight obtains blank than mixing；

3) blank being filled with into metal die cavity, 10s being suppressed under 5KPa, (a diameter of 15cm is highly to obtain molding blank 30cm)。

Reference examples 4

1) eastern mud, western mud are taken by 6：4 mixing, are crushed to 1 μm, obtain blank；

2) blank being filled with into metal die cavity, 10s being suppressed under 5KPa, (a diameter of 15cm is highly to obtain molding blank 30cm)。

Embodiment 5

) eastern mud, western mud are taken by 4：6 mixing, are crushed to 30 μm, obtain potter's clay powder；

Experimental example

Respectively will be embodiment 1～5 and molding blank obtained in reference examples 1～4 each 100, the base substrate of embodiment is placed in Fire at 1120 DEG C, statistics burns till rate respectively, and concrete outcome see the table below：

Claims

1. the briquetting process of Nixing pottery, it is characterised in that：Comprise the following steps：

2. the briquetting process of Nixing pottery according to claim 1, it is characterised in that：Step 1) in, eastern mud and western mud Weight ratio be 4～6：4～6.

3. the briquetting process of Nixing pottery according to claim 1, it is characterised in that：Step 1) in, eastern mud, western mud are mixed Conjunction is crushed to 1～10 μm.

4. the briquetting process of Nixing pottery according to claim 3, it is characterised in that：Eastern mud, western mud co-grinding to 5 ～10 μm.

5. the briquetting process of Nixing pottery according to claim 1, it is characterised in that：Step 2) in, SnO₂It is crushed to 1 ～10 μm.

6. the briquetting process of Nixing pottery according to claim 5, it is characterised in that：SnO₂It is crushed to 5～10 μm.

7. the briquetting process of Nixing pottery according to claim 1, it is characterised in that：Step 1) in, eastern mud and western mud Weight ratio be 6：4.