Method for manufacturing a coloured item, in particular coloured grey, made of zirconia, and coloured zirconia decorative item obtained according to said method
A technology for zirconia-based products, applied in mechanically driven clocks, clockwork protection, instruments, etc., can solve problems such as hindering shape, unable to color products, undesired stripes and marbling
Active Publication Date: 2016-05-04
COMADUR
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Problems solved by technology
The disadvantage of this method is in particular the inability to color the article firmly so that it hinders any subsequent processing of the article after treatment to obtain its final shape
Additionally, the resulting surface color is not uniform and has undesirable striations and marbling
Method used
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[0033] Other characteristics and advantages of the invention will become apparent in view of the following description, which explains a non-limiting practical example of the invention given for illustration.
[0034] The first example of the production method of the invention, now described in detail, enables the formation of gray sintered zirconia-based articles whose appearance and mechanical properties are particularly well suited to form components of watches or to form any other decorative and / or functional article.
[0035] The gray zirconia article obtained according to this first example comprises 98.8% by weight of stabilized zirconia and the remainder 0.5% by weight of vanadium oxide powder (V 2 o 5 ), 0.2% by weight of silicon dioxide powder (SiO 2 ) and 0.5% by weight chromium oxide powder (Cr 2 o 3 ).
[0036] Zirconia is conventionally stabilized in the tetragonal phase by at least one stabilizer selected from oxides comprising yttrium oxide, magnesia and ca...
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Abstract
A process for the production of a grey zirconia-based article wherein a first mixture includes a zirconia powder forming the base constituent, 4% to 15% by weight of at least one stabiliser selected from among the group of oxides including yttrium oxide, magnesium oxide and calcium oxide alone or in combination, 0.1% to 1% by weight of a vanadium oxide powder (V2O5), 0.1% to 1% by weight of a chromium oxide powder (Cr2O3) and 0.1% to 1% by weight of a silicon oxide powder (SiO2); making a second mixture including the first mixture and a binder; making a granulated mixture by conducting a granulation of the second mixture; forming a blank by giving this second granulated mixture the shape of the desired article; sintering the blank in air for at least thirty minutes at a temperature in the range of between 1250 DEG and 1550 DEG C.
Description
technical field [0001] The present invention relates to a process for the production of colored articles based on zirconia, in particular such articles having a color in the gray range and prepared by sintering. For convenience, this article is referred to as "gray article" in the following description. [0002] The invention also relates to a gray zirconia-based decorative article obtained in particular by the above method. Background technique [0003] It is known from document CN102659401 to produce articles from gray ceramic materials by heat-treating zirconia materials in a graphite vacuum furnace, which results in a black / gray surface oxidation of the articles. The disadvantage of this method is in particular the inability to color the article firmly so that it hinders any subsequent processing of the article after treatment to obtain its final shape. Furthermore, the resulting surface color was not uniform and had undesirable striations and marbling. [0004] The m...
Claims
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IPC IPC(8): C04B35/48C04B35/622
CPCC04B35/48C04B35/481C04B35/486C04B35/62695C04B35/634C04B2235/3206C04B2235/3208C04B2235/3217C04B2235/3225C04B2235/3239C04B2235/3241C04B2235/3246C04B2235/3267C04B2235/3272C04B2235/3418C04B2235/5436C04B2235/5445C04B2235/6022C04B2235/6562C04B2235/6567C04B2235/9661G04B37/225C04B35/64
Inventor A·阿克蒂斯-达塔D·卡蒂尔
Owner COMADUR