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Fabrication process of low expansion Nixing pottery

A production process, a technology for making pottery, applied in clay products, applications, household appliances, etc., can solve the problems of large thermal expansion coefficient, large volume expansion, and high thermal expansion coefficient of mullite, and achieve excellent thermal shock resistance and good mechanical properties. the effect of strength

Active Publication Date: 2017-01-25
钦州六艺龙窑坭兴陶有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SiO in the blank of Nixing pottery 2 The content is as high as 67.7%, Al 2 o 3 The content is 18.14%, a part of SiO 2 with Al 2 o 3 The reaction produces mullite, which has a high thermal expansion coefficient; part of it becomes free quartz, which will undergo crystal transformation at high temperature, from quartz to cristobalite, and the expansion coefficient of cristobalite is much larger than that of quartz. Moreover, the conversion of quartz to cristobalite will produce a large volume expansion, which will lead to a large thermal expansion coefficient of Nixing pottery vessels, generally at 5×10 -6 / ℃ or above, it can only be used as daily-use ceramic utensils, such as conventional cups, saucers, teapots, vases, and cannot be used as cooking utensils under open flame conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1) Preparation of billets: 500kg of Dongni, 400kg of Xini, TiO 2 150kg, MgO 150kg, NiO 50kg, mix evenly, after grinding, pressure filtration, vacuum mud refining, stale process, get the billet;

[0016] 2) Forming the green body: make the green body into 100 small vessel green bodies with outer diameter <170mm and capacity <1000ml;

[0017] 3) Drying of the green body: drying the green body;

[0018] 4) Green body firing: Put the dried green body into the kiln, raise the temperature to 250°C at a rate of 20°C per hour, and then stop the fire at 1050°C at a rate of 50°C per hour. After cooling out of the kiln.

[0019] Fill the Nixing pottery products one by one with water and put them directly into the gas stove for heating without cracking, and perform heat exchange at 800°C to 20°C one by one without cracking.

Embodiment 2

[0021] 1) Preparation of billet: 600kg of Dongni, 500kg of Xini, TiO 2 200kg, MgO 200kg, NiO 100kg, mix evenly, after grinding, press filtration, vacuum mud refining, stale process, get the billet;

[0022] 2) Body molding: make the body into 100 medium-sized vessel bodies with an outer diameter of 170-230mm and a capacity of 1000-2500ml;

[0023] 3) Drying of the green body: drying the green body;

[0024] 4) Green body firing: put the dried green body into the kiln, raise the temperature to 350°C at a rate of 30°C per hour, and then stop the fire at a rate of 100°C per hour to 1150°C. After cooling out of the kiln.

[0025] The finished Nixing pottery utensils were filled with water one by one and put them directly into the gas stove for heating without cracking, and carried out heat exchange at 800°C to 20°C one by one without cracking.

Embodiment 3

[0027] 1) Preparation of blanks: 600kg of Dongni, 400kg of Xini, TiO 2 150kg, MgO 200kg, NiO 60kg, mix evenly, after grinding, press filtration, vacuum mud refining, stale process, get the billet;

[0028] 2) Forming the green body: make the green body into 100 large vessel green bodies with outer diameter>230mm and capacity>2500ml;

[0029] 3) Drying of the green body: drying the green body;

[0030] 4) Green body firing: Put the dried green body into the kiln, raise the temperature to 300°C at a rate of 25°C per hour, and then stop the fire at a rate of 80°C per hour to 1100°C. After cooling out of the kiln.

[0031] The finished Nixing pottery utensils were filled with water one by one and put them directly into the gas stove for heating without cracking, and carried out heat exchange at 700°C to 20°C one by one without cracking.

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Abstract

The invention discloses a fabrication process of low expansion Nixing pottery. The process comprises the steps of blank preparation, blank forming, blank trimming, blank stoving and blank firing. The process of low expansion Nixing pottery is characterized in that the blank prepared from, by weight, 5-6 parts of east mud, 4-5 parts of west mud, 0.5-1 part of NiO, 1.5-2 parts of TiO2 and 1.5-2 parts of MgO. The Nixing dishes prepared through the fabrication process of low expansion Nixing pottery have the advantages of excellent thermal shock resistance, good mechanical strength and capable of being used in various heat sources directly without cracking even after being used for a long period. The Nixing pottery dishes prepared through the process of low expansion Nixing pottery can meet the requirements of QB / T2580-2002 <Fine ceramic cookware>.

Description

technical field [0001] The invention relates to a manufacturing process of Nixing pottery, in particular to a manufacturing process of low-expansion Nixing pottery. Background technique [0002] Nixing pottery in Qinzhou, Zisha pottery in Yixing, Rongchang pottery in Sichuan and Jianshui pottery in Yunnan are also known as the four famous pottery in China. The production process of Nixing pottery includes blank preparation, blank molding, blank trimming, blank drying, blank decoration, blank firing and polishing. The raw materials used in Nixing pottery include Dongni and Xini. The Dongni is selected from the east of the Qinjiang River across the urban area of ​​Qinzhou City. It is a soft clay with a yellowish-white color and a small amount of quartz sand. It has good plasticity and is easy to shape. , but the refractoriness is quite low, and it is easy to deform when fired alone; Xini is the soil in the area west of Qinjiang River. It is a kind of purple mudstone with high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/13C04B33/32
CPCC04B33/131C04B33/32C04B2235/3206C04B2235/3232C04B2235/3279C04B2235/96C04B2235/9607
Inventor 刘缘靖刘缘智
Owner 钦州六艺龙窑坭兴陶有限公司
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