A purple pottery ultra-fine pattern tin powder composite inlay forming process

Abstract

The application discloses a purple pottery superfine pattern tin powder composite inlay forming process and relates to the technical field of metal inlay processing of purple pottery handicrafts. The application comprises the following steps: obtaining a purple pottery blank and a target tin inlay pattern, forming a non-dovetail fine pattern groove on the surface of the purple pottery blank according to the pattern line of the target tin inlay pattern, and extending the non-dovetail fine pattern groove along the pattern line. The application forms a tin powder composite inlay in the superfine pattern line by forming a non-dovetail fine pattern groove on the surface of the purple pottery blank and filling a pasty tin powder composite inlay material formed by tin powder, natural lacquer and a diluent into the groove. The application does not mechanically hold the metal inlay by means of a dovetail reverse structure, reduces the limitation of the groove cross-section shape on the pattern line width, the turning position and the staggered texture, and makes the complex patterns such as fine brush calligraphy, micro-sculpture texture and special-shaped curves have a stable tin inlay forming basis.

Description

Technical Field

[0001] This invention belongs to the field of metal inlay processing technology for purple clay handicrafts, and in particular relates to a process for forming ultra-fine patterns on purple clay using tin powder composite fusion. Background Technology

[0002] Zitao inlay with tin is a metal decoration technique used on the surface of Zitao handicrafts. It is commonly used to decorate teapots, vases, pen holders, and ornaments with text, calligraphy, lines, and textures. In current Zitao inlay processing, craftsmen typically first carve grooves into the surface of the Zitao clay body according to the outline of the design. After the grooves are completed, dust and debris are cleaned, and then metal materials such as tin, copper, and silver are filled into the grooves, creating a decorative pattern with a metallic luster on the clay surface. To maintain the position of the metal inlay within the groove, current techniques often employ a dovetail groove structure with a narrow opening and a wide bottom. The opening of the groove restricts the movement of the metal inlay, while the bottom accommodates the metal material. During subsequent processing, the metal material is heated to a molten state, and the molten metal enters the pattern area along the groove outline. After cooling, it remains within the groove. Further trimming, grinding, and polishing are then performed to make the surface of the metal inlay nearly flush with the surface of the Zitao clay body, creating the Zitao metal inlay decorative effect.

[0003] The core deficiency of existing Zitao tin-inlay techniques lies in the fact that the fixation of the metal inlay relies on the dovetail groove structure, making it difficult to stably form ultra-fine and complex patterns. The dovetail groove needs to maintain a cross-sectional relationship of small opening and large base, which limits the groove width, groove depth, and groove wall angle. Fine calligraphy, micro-carved textures, intersecting lines, and irregular curves have relatively small line widths and many groove turns, making it difficult to form a continuous and stable dovetail cross-section during grooving. This easily leads to groove breakage, edge chipping, or pattern distortion, thus limiting the space for fine decoration in Zitao tin-inlay products. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a process for forming ultra-fine patterns in purple clay using tin powder composite fusion. The technical problem this invention aims to solve is: how to solve the problem that traditional purple clay tin inlay relies on the mechanical holding of dovetail grooves, which makes it difficult to stably form ultra-fine and complex patterns, through a process of forming non-dovetail fine pattern grooves, pressing and filling tin powder composite inserts in grooves, and in-situ curing at constant temperature.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a process for forming ultra-fine patterns using tin powder composite fusion in purple clay pottery, comprising: S1. Obtain a purple clay blank and a target tin-inlay pattern. Form a non-dovetail fine pattern groove on the surface of the purple clay blank according to the pattern lines of the target tin-inlay pattern. The non-dovetail fine pattern groove extends along the pattern lines and does not have a dovetail buckle structure for mechanically holding the metal inlay. S2. Mix tin powder, natural lacquer and thinner to form a paste-like tin powder composite insert; S3. Press the tin powder composite insert into the non-dovetail fine pattern groove. The tin powder composite insert is continuously distributed along the non-dovetail fine pattern groove and adheres to the groove wall to form a tin-inserted layer to be cured. S4. Place the purple ceramic blank with the tin-embedded layer to be cured in a constant temperature oven for baking and curing, so that the tin-embedded layer to be cured is cured in situ in the non-dovetail fine pattern groove to form a tin powder composite inlay. S5. Trim, grind and polish the surface of the purple clay blank with the tin powder composite inlay to obtain the finished purple clay inlaid with tin.

[0006] The present invention is further configured such that the groove opening width of the non-dovetail fine pattern groove is not less than the groove bottom width, and the groove wall of the non-dovetail fine pattern groove does not form an undercut surface from the groove opening to the groove bottom where the groove bottom is wider than the groove opening.

[0007] The present invention is further configured such that, before filling, the non-dovetail fine pattern groove is cleaned of floating dust inside the groove. The cleaning of floating dust inside the groove includes brushing the non-dovetail fine pattern groove along the pattern lines with a soft brush, and moving the negative pressure suction port along the non-dovetail fine pattern groove to remove floating dust and debris inside the non-dovetail fine pattern groove. The cleaning of floating dust inside the groove does not include cleaning with acidic cleaning solution, stearic acid melting, or rosin melting.

[0008] The present invention is further configured such that the tin powder has a tin content of not less than 99.9% and the particle size of the tin powder is 300 mesh to 800 mesh.

[0009] The present invention is further configured such that the diluent is a diluent used to adjust the viscosity of the natural lacquer, and the mass ratio of the diluent to the natural lacquer is 1.5:1-2.5:1.

[0010] The present invention is further configured such that the tin powder composite insert is compacted in sections at the turning and intersecting positions of the pattern lines to form multiple compacted sections, and the ends of adjacent compacted sections overlap each other.

[0011] The present invention is further configured such that the baking temperature for baking and curing is 180℃-220℃ and the baking time is 15min-30min; after baking, the purple clay body is not removed from the constant temperature oven and is kept at a constant temperature for 30min-60min in the constant temperature oven.

[0012] The present invention is further configured such that the trimming, grinding and polishing sequentially include: after the tin powder composite inlay cools, trimming the solidified residue exposed outside the groove of the non-dovetail fine pattern along the pattern lines; grinding the exposed surface of the tin powder composite inlay with 800-1200 grit abrasive material; and simultaneously polishing the exposed surface of the tin powder composite inlay and the surface of the adjacent purple clay body with 1500-3000 grit abrasive material.

[0013] The beneficial effects of this invention are as follows: This invention forms a non-dovetail fine pattern groove on the surface of a purple clay body, and presses a paste-like tin powder composite inlay, composed of tin powder, natural lacquer, and a thinner, into the groove, thereby achieving the formation of a tin powder composite inlay within ultra-fine pattern lines. It does not rely on a dovetail-shaped inverted structure for mechanically holding the metal inlay, reducing the limitations imposed by the groove cross-sectional shape on pattern line width, turning points, and interlacing textures, thus providing a stable foundation for the inlay forming of complex patterns such as fine calligraphy, micro-carved textures, and irregular curves.

[0014] This invention employs a method of in-situ curing and constant-temperature baking to continuously distribute and adhere the tin powder composite insert within the groove of the non-dovetail fine pattern, reducing the problems of discontinuous filling, gaps, and pattern edge distortion caused by traditional molten metal pouring into fine grooves. Subsequent trimming, grinding, and polishing processes enable the exposed surface of the tin powder composite insert to form a continuous decorative surface with the surface of the purple clay blank, improving the pattern clarity and surface consistency of the finished purple clay inlaid tin. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0016] Figure 1 This is a flowchart of the overall process of the present invention.

[0017] Figure 2 This is a schematic diagram of the cross-sectional structure of the non-dovetail fine pattern groove of the present invention.

[0018] Figure 3 This is a schematic diagram of the trimming and polishing layers after the present invention has been cured. Detailed Implementation

[0019] The technical solutions of the present invention will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present invention, and not all embodiments. Example 1

[0020] Please see Figures 1-3 This invention relates to a process for forming ultra-fine patterns using tin powder composite fusion in purple clay pottery, comprising: S1. Obtain the purple clay blank and the target tin inlay pattern. Based on the pattern lines of the target tin inlay pattern, form a non-dovetail fine pattern groove on the surface of the purple clay blank. The non-dovetail fine pattern groove extends along the pattern lines and does not have a dovetail-like undercut structure for mechanically holding the metal inlay. The groove opening width is not less than the groove bottom width, and the groove wall from the opening to the bottom does not form an undercut surface where the bottom is wider than the opening. Before filling, the non-dovetail fine pattern groove is cleaned of floating dust. This cleaning includes brushing the non-dovetail fine pattern groove along the pattern lines with a soft brush and moving a negative pressure suction port along the groove to remove floating dust and debris. This cleaning does not include acid cleaning, stearic acid lamination, or rosin lamination.

[0021] S2. Mix tin powder, natural lacquer, and thinner to form a paste-like tin powder composite insert. The tin powder has a tin content of not less than 99.9% and a particle size of 300-800 mesh. The thinner is used to adjust the viscosity of the natural lacquer, and the mass ratio of thinner to natural lacquer is 1.5:1-2.5:1.

[0022] S3. The tin powder composite insert is pressed into the non-dovetail fine pattern groove. The tin powder composite insert is continuously distributed along the non-dovetail fine pattern groove and adheres to the groove wall to form a tin-inserted layer to be cured. The tin powder composite insert is compacted in sections at the turning and intersecting positions of the pattern lines to form multiple pressed sections, and the ends of adjacent pressed sections overlap each other.

[0023] S4. Place the purple clay blank with the tin-inlaid layer to be cured in a constant temperature oven for baking and curing. This allows the tin-inlaid layer to be cured in situ within the non-dovetail fine pattern grooves, forming a tin powder composite inlay. The baking temperature for curing is 180℃-220℃, and the baking time is 15min-30min. After baking, the purple clay blank is not removed from the constant temperature oven and is left to stand at a constant temperature for 30min-60min.

[0024] S5. Trim, grind, and polish the surface of the purple clay body with the tin powder composite inlay to obtain the finished purple clay inlaid with tin. The trimming, grinding, and polishing include: after the tin powder composite inlay cools, trimming away the solidified excess material exposed outside the groove of the non-dovetail fine pattern along the pattern lines. Grinding the exposed surface of the tin powder composite inlay with 800-1200 grit abrasive. Simultaneously polishing the exposed surface of the tin powder composite inlay and the surface of the adjacent purple clay body with 1500-3000 grit abrasive.

[0025] In this invention, the non-dovetail fine pattern groove is used to support the fine lines, turns, and intersections of the target tin-embedded pattern. The groove no longer relies on a dovetail inverted structure with a small opening and a large bottom to form a metal clamping mechanism. The tin powder composite insert enters the groove in a paste-like state, which can distribute along the pattern lines and adhere to the groove wall, so that the tin-embedded material and the ultra-fine pattern groove form a continuous contact relationship.

[0026] Tin powder, natural lacquer, and thinner are combined to form a press-fillable tin powder composite insert. After being baked at a constant temperature, it solidifies in situ within the groove, forming a tin powder composite insert corresponding to the pattern lines. This forming method transforms the traditional process path, which relies on dovetail groove fixation and molten tin pouring, into a process path that uses a non-dovetail groove for support, paste-like insert filling, and in-groove solidification. Example 2

[0027] This embodiment illustrates the basic forming process of fine calligraphy patterns on the surface of a purple clay pen holder under conditions of non-dovetail fine pattern grooves, tin powder composite inlay pressing, and constant temperature baking and curing.

[0028] 1. Preparation of purple clay body and pattern A semi-finished purple clay pen holder was selected as the processing object. The pen holder is 180mm high, 86mm in outer diameter, and 7mm thick. The target inlaid tin pattern is a single-column running script pattern, with a total line length of 420mm, a line width of 0.35mm-0.75mm, and a minimum turning radius of 0.8mm.

[0029] 2. Non-dovetail fine pattern groove formation The inlaid tin pattern is engraved along its lines to form a non-dovetail fine-patterned groove on the outer surface of the clay body. The groove width is determined by expanding the corresponding line width by 0.05mm-0.07mm. The groove width for the non-dovetail fine-patterned groove is 0.42mm-0.82mm, the bottom width is 0.38mm-0.76mm, and the depth is 0.28mm-0.36mm. The groove width is not less than the bottom width, and the groove wall does not form an inverted surface where the bottom is wider than the opening.

[0030] 3. Cleaning of floating dust inside the tank After grooving, use a 3mm wide soft-bristled brush to brush along the pattern lines in the non-dovetail fine pattern grooves. The brush bristle diameter should be 0.06mm-0.10mm. The brushing direction should be consistent with the extension direction of the pattern lines. Then, use a 2mm inner diameter negative pressure suction port to move along the non-dovetail fine pattern grooves. The distance between the negative pressure suction port and the groove opening should be 1mm-3mm, the negative pressure value should be -6kPa to -8kPa, and the moving speed should be 8mm / s-12mm / s. After cleaning, do not use acidic cleaning solutions, stearic acid plating, or rosin plating in the non-dovetail fine pattern grooves.

[0031] 4. Tin powder composite insert preparation Take 10.0g of 500-mesh tin powder with a tin content of not less than 99.9%, 2.0g of natural lacquer, and 4.0g of thinner. First, stir the natural lacquer and thinner for 2 minutes, then add the tin powder in three batches, stirring for 1-2 minutes after each addition. After mixing, a paste-like tin powder composite insert is obtained. The tin powder composite insert is scraped up by a scraper to form a continuous paste strip. After being placed on a flat ceramic tile surface and left to stand for 30 seconds, the edge displacement should not exceed 1mm.

[0032] 5. Trench compaction A flexible scraper is used to press the tin powder composite insert into the non-dovetail fine pattern grooves. The single pressing length for straight line segments is 30mm-50mm, with short-distance pressing used at turning points. After pressing, the tin powder composite insert is continuously distributed along the non-dovetail fine pattern groove and adheres to the groove wall, forming a tin-inserted layer to be cured. A 0.05mm-0.15mm insert margin is left on the outer side of the groove opening, and the insert margin does not cover adjacent pattern lines.

[0033] 6. Baking and curing Place the purple clay blank with the tin-inlaid layer to be cured into a constant temperature oven. Set the baking temperature to 200℃ and the baking time to 20 minutes. After baking, do not remove the purple clay blank; let it remain in the constant temperature oven for another 40 minutes. After resting, remove it and allow it to cool naturally to room temperature. During the baking and curing process, do not pour molten tin into the non-dovetail fine pattern grooves; the tin powder composite inlay is formed by the tin powder composite inlay solidifying within the groove.

[0034] 7. Trimming, sanding, and polishing After cooling, remove any remaining cured material exposed outside the grooves of the non-dovetail fine pattern along the pattern lines. Grind the exposed surface of the tin powder composite inlay with 1000-grit abrasive, then simultaneously polish the exposed surface of the tin powder composite inlay and the adjacent purple clay body surface with 2000-grit abrasive. After treatment, the exposed surface of the tin powder composite inlay is flush with the surface of the adjacent purple clay body.

[0035] 8. Finished product inspection The finished product was observed using a 20x magnifying glass. The calligraphic lines were continuous, and no gaps longer than 0.3mm were observed at the turning points. The width of the chipped edge of the groove was no greater than 0.1mm. The height difference between the exposed surface of the tin powder composite inlay and the surface of the adjacent purple clay body was no greater than 0.05mm.

[0036] Through the above steps, the fine calligraphy lines in the finished purple clay inlaid with tin are continuous, and there are no gaps longer than 0.3mm at the turning points. The chipping width at the edge of the groove is no more than 0.1mm, and the height difference between the exposed surface of the tin powder composite inlay and the surface of the adjacent purple clay body is no more than 0.05mm. This indicates that the non-dovetail fine pattern groove can meet the requirements for tin inlay forming of fine line patterns. Example 3

[0037] This embodiment illustrates the inlay forming process of the interlaced texture pattern on the curved surface of a purple clay vase under conditions of multiple turns, interlaced lines, and curved areas.

[0038] 1. Preparation of purple clay body and pattern A semi-finished purple clay vase was selected as the processing object. The vase is 500mm high, with a maximum outer diameter of 160mm and a wall thickness of 9mm. The target tin-inlaid pattern is a combination of floral and irregular curve patterns. The total length of the pattern lines is 1260mm, the line width is 0.25mm-1.10mm, there are 36 intersections, and the minimum distance between adjacent lines is 0.9mm.

[0039] 2. Non-dovetail fine pattern groove formation Carve along the pattern lines of the target inlaid tin design on the curved surface of the purple clay vase. The groove width is determined by extending 0.07mm-0.10mm beyond the corresponding line width. For non-dovetail fine pattern grooves, the groove width is 0.32mm-1.20mm, the bottom width is 0.28mm-1.05mm, and the depth is 0.25mm-0.45mm. At intersecting locations, process the main groove first, then the branch groove. At the intersection of the main and branch grooves, retain a continuous bottom and do not process the dovetail overhang.

[0040] 3. Cleaning of floating dust inside the tank Use a 2mm wide soft-bristled brush to brush along the pattern lines of the non-dovetail fine pattern grooves. The brush bristle diameter should be 0.05mm-0.08mm. At the intersections, brush the main grooves first, then the branch grooves. Next, use a 1.5mm inner diameter negative pressure suction port to move along the non-dovetail fine pattern grooves, maintaining a distance of 1mm-2mm between the suction port and the groove opening, with a negative pressure value of -7kPa to -9kPa. Hold the suction port at the intersection for 1-2 seconds. After cleaning, do not use acidic cleaning solutions, stearic acid, or rosin in the grooves.

[0041] 4. Tin powder composite insert preparation Take 12.0g of 600-mesh tin powder with a tin content of not less than 99.9%, 2.0g of natural lacquer, and 4.4g of thinner. The mass ratio of thinner to natural lacquer is 2.2:1. First, stir the natural lacquer and thinner until uniform, then add the tin powder and continue stirring for 5 minutes. The resulting tin powder composite insert is in paste form. After spreading the tin powder composite insert with a scraper, let it stand for 30 seconds; the edge displacement should not exceed 1mm.

[0042] 5. Trench compaction The tin powder composite insert is pressed into the non-dovetail fine pattern grooves. Straight sections are continuously pressed, with a single pressing length of 25mm-40mm. Turning and intersecting positions are compacted in segments, with segment lengths of 8mm-15mm and an overlap length of 1mm-2mm between adjacent pressed segments. Additional pressing is applied to areas below the groove opening. After pressing, the tin powder composite insert is continuously distributed along the pattern lines and adheres to the groove wall, forming a tin-inserted layer to be cured. The insert margin outside the groove opening is 0.06mm-0.18mm.

[0043] 6. Baking and curing Place the purple clay vase with the tin-embedded layer to be cured vertically in a constant temperature oven. Set the baking temperature to 210℃ and the baking time to 25 minutes. After baking, do not remove the purple clay vase from the constant temperature oven; allow it to stand for another 50 minutes. After standing, remove it and allow it to cool naturally. During the baking and curing process, do not pour molten tin into the grooves that are not part of the dovetail fine pattern. The tin powder composite inlay is formed by the tin powder composite inlay material curing within the groove.

[0044] 7. Trimming, sanding, and polishing After cooling, use a trimming tool to remove any solidified residue outside the groove along the pattern lines. Polish the exposed surface of the tin powder composite inlay with 800-grit abrasive, following the pattern lines. Then, simultaneously polish the exposed surface of the tin powder composite inlay and the adjacent purple clay body surface with 2500-grit abrasive. At intersecting locations, polish first along the main lines, then along the branch lines.

[0045] 8. Finished product inspection The finished product was observed using a 20x magnifying glass. Continuous tin powder composite inlays were formed at the intersections, turning points, and ends of fine lines. No gaps longer than 0.3 mm were observed at the intersections. The width of the burrs overflowing from the edges of the pattern in the curved areas was no greater than 0.1 mm. The height difference between the exposed surface of the tin powder composite inlay and the surface of the adjacent purple clay body was no greater than 0.05 mm.

[0046] In summary, in the obtained purple clay inlaid with tin, continuous tin powder composite inlays are formed at the intersections, turning points, and ends of fine lines. No gaps longer than 0.3 mm are observed at the intersections. The width of the overflow burrs at the edge of the pattern in the curved area is no more than 0.1 mm. The height difference between the exposed surface of the tin powder composite inlay and the surface of the adjacent purple clay body is no more than 0.05 mm. This indicates that this process is suitable for forming purple clay inlaid with tin on complex curved surfaces, with multiple turns and intersecting lines. Example 4

[0047] This example is a comparative example used to illustrate the forming process of traditional dovetail groove tin inlay in fine calligraphy patterns.

[0048] 1. Preparation of purple clay body and pattern A semi-finished purple clay pen holder of the same specifications as in Example 2 was selected as the processing object. The pen holder has a height of 180mm, an outer diameter of 86mm, and a wall thickness of 7mm. The target tin-inlaid pattern is a single-column running script pattern with a total line length of 420mm, a line width of 0.35mm-0.75mm, and a minimum turning radius of 0.8mm.

[0049] This comparative example uses the same purple clay blank, the same target tin-inlay pattern, and the same post-processing method as Example 2. The difference is that the pattern groove adopts a dovetail groove structure, and the tin-inlay material is filled with molten tin.

[0050] 2. Dovetail groove machining Machining dovetail grooves along the pattern lines of the target tin-embedded pattern. The width of the dovetail groove opening is determined by reducing the width of the corresponding pattern line inward by 0.10mm-0.25mm, and the width of the groove bottom is determined by expanding the width of the groove opening outward by 0.20mm-0.35mm. The width of the dovetail groove opening is 0.25mm-0.50mm, the width of the groove bottom is 0.45mm-0.85mm, and the groove depth is 0.35mm-0.50mm.

[0051] The dovetail grooves were machined in stages using a 0.3mm-0.5mm micro-engraving tool. In areas where the line width was less than 0.5mm, limitations imposed by the groove opening width and bottom widening requirements prevented some transition points from forming a continuous cross-sectional relationship with a smaller opening and larger bottom. After grooving, discontinuous groove segments with lengths of 0.6mm-1.2mm appeared at the line transition points, and the chipped edge width at the groove opening was 0.18mm-0.35mm.

[0052] 3. Filling with molten solder The solder used is a solder bar with a tin content of not less than 99.9%. The solder bar is heated to 250℃-270℃ using a constant-temperature soldering furnace, with the temperature displayed by the furnace's temperature control probe. No additional flux is used during the filling process.

[0053] Molten solder is poured into the patterned line area along the dovetail groove opening. Within the aforementioned temperature range, the solder remains molten. For fine line segments with a groove opening width of less than 0.4 mm and at small-radius bends, the molten solder penetrates unevenly. After cooling, some fine line ends do not form continuous metal inlays, and there are gaps of 0.5 mm to 1.0 mm in length at bends.

[0054] 4. Trimming, sanding, and polishing After cooling, the surface of the purple clay body is trimmed, ground, and polished. The exposed surface of the metal inlay is ground with 1000-grit abrasive, and then the exposed surface of the metal inlay and the adjacent purple clay body surfaces are polished with 2000-grit abrasive. After grinding, the edges of the metal inlay at some turning points are discontinuous, and some chipped edges of the grooves are still located at the edges of the pattern lines.

[0055] 5. Finished product inspection The finished product was observed using a 20x magnifying glass. The length of the missing section, the width of the chipped edge, and the height difference were measured using a graduated micrometer and a digital depth gauge, and the detection method was the same as in Example 2.

[0056] There are gaps longer than 0.5 mm in the calligraphic lines. There are 9 locations where the chipped edge width is greater than 0.15 mm. The height difference between the exposed surface of the tin inlay and the surface of the adjacent purple clay body is 0.08 mm-0.16 mm. Compared with Example 2, this comparative example shows poorer continuous tin inlay at the turning points and the ends of the fine lines under the same fine calligraphic pattern conditions. Example 5

[0057] This embodiment illustrates the process of forming a combination of gold, silver, copper, and tin metallic patterns on the surface of a purple clay body, using the purple clay body as a carrier for the metallic decorative pattern.

[0058] 1. Preparation of purple clay body and pattern A semi-finished purple clay vase with a height of 500mm, a maximum outer diameter of 160mm, and a wall thickness of 9mm was selected as the processing object. The target inlay patterns include text, floral patterns, and decorative borders. Tin-colored pattern areas, gold-colored pattern areas, silver-colored pattern areas, and copper-colored pattern areas are set in the patterns respectively.

[0059] The pattern line width is 0.40mm-1.20mm. A purple clay substrate spacer with a width of 0.80mm-1.50mm is maintained between adjacent metal pattern areas. No pattern grooves are made in the purple clay substrate spacer area, nor is metal powder composite inlay filled in.

[0060] 2. Non-dovetail fine pattern groove formation Along the pattern lines of the target inlay pattern, non-dovetail fine pattern grooves corresponding to the four metal pattern areas are formed on the surface of the purple clay body.

[0061] The groove opening width is 0.45mm-1.25mm, the groove bottom width is 0.40mm-1.10mm, and the groove depth is 0.30mm-0.45mm. The groove opening width is not less than the groove bottom width, and the groove wall from the groove opening to the groove bottom does not form an undercut surface where the groove bottom is wider than the groove opening.

[0062] 3. Metal powder composite insert formulation The tin powder used is 500-mesh tin powder with a tin content of not less than 99.9%. Take 10.0g of tin powder, 2.0g of natural lacquer and 4.0g of thinner, and mix them to form a tin powder composite insert.

[0063] The copper powder used is 500-mesh copper powder with a copper content of not less than 99.5%. Take 10.0g of copper powder, 2.0g of natural lacquer and 4.0g of thinner, and mix them to form a copper powder composite insert.

[0064] The silver powder used is 500-mesh silver powder with a silver content of not less than 99.9%. Take 8.0g of silver powder, 1.6g of natural lacquer and 3.2g of thinner, and mix them to form a silver powder composite inlay.

[0065] The gold powder used is 500-mesh gold powder with a gold content of no less than 99.9%. Take 5.0g of gold powder, 1.0g of natural lacquer, and 2.0g of thinner, and mix them to form a gold powder composite inlay. The four types of metallic powder composite inserts were prepared using separate containers and separate scrapers. First, the natural lacquer and thinner were stirred for 2 minutes, then the corresponding metallic powders were added in three batches. After all the metallic powders were added, stirring was continued for 3-5 minutes.

[0066] The prepared metal powder composite insert is scraped up to form a continuous strip. A small amount of insert is placed on the surface of a horizontal ceramic tile, and after standing for 30 seconds, the edge displacement does not exceed 1 mm.

[0067] 4. General Rules for Zoning and Compaction Before pressing each type of metal powder composite insert, the corresponding area to be filled is first locally cleaned. A soft brush with a width of 2mm is used to brush along the pattern lines to clean the grooves of non-dovetail fine patterns, and then a negative pressure dust suction port with an inner diameter of 1.5mm is used to remove floating dust and debris from the grooves.

[0068] The distance between the negative pressure suction port and the groove should be maintained at 1mm-2mm, and the negative pressure value should be -7kPa to -9kPa. Immediately after cleaning, the corresponding metal powder composite insert should be pressed in.

[0069] The single compaction length for straight sections is 25mm-40mm. At turning and intersecting points, segmented compaction is used, with each compaction segment being 8mm-15mm long and the overlap length between adjacent segments being 1mm-2mm. A 0.05mm-0.15mm allowance for inserting material is left on the outer side of the groove.

[0070] Different metal pattern areas were filled using separate scrapers. After completing one metal pattern area, residual filler material was removed from the interlayer areas of the terracotta substrate and the surfaces of adjacent unfilled areas, followed by baking and curing. 5. Copper powder composite embedding and curing First, clean the copper-colored pattern area, then press the copper powder composite inlay into the corresponding non-dovetail fine pattern groove.

[0071] Preheat the oven to 210℃. Place the purple clay body with the copper-colored pattern area filled in on it. Start timing when the oven temperature returns to 210℃±3℃ and bake for 25 minutes.

[0072] After baking, do not remove the clay body from the oven; let it rest in the constant-temperature oven for another 50 minutes. Then remove it and let it cool naturally until the surface temperature of the clay body does not exceed 40℃.

[0073] 6. Tin powder composite embedding and curing The tin-colored pattern area was brushed again with a soft brush and vacuumed under negative pressure. The tin powder composite insert was then pressed into the corresponding non-dovetail fine pattern groove.

[0074] Preheat the oven to 200℃. Place the clay body inside and start timing when the oven temperature returns to 200℃±3℃. Bake for 20 minutes.

[0075] After baking, the purple clay body remains in the constant temperature oven for 40 minutes. After removal, it is allowed to cool naturally until the surface temperature does not exceed 40℃.

[0076] After cooling, the solidified copper-colored pattern area was re-examined using a 20x magnifying glass. No cracks wider than 0.10 mm were found in the copper powder composite inlay, and the edge lifting height was no greater than 0.05 mm.

[0077] 7. Silver Powder Composite Embedding and Curing The silver pattern area was brushed again with a soft brush and vacuumed under negative pressure to press the silver powder composite inlay into the corresponding non-dovetail fine pattern groove.

[0078] Preheat the oven to 190℃. Place the clay body inside and start timing when the oven temperature returns to 190℃±3℃. Bake for 20 minutes.

[0079] After baking, the purple clay body remains in the constant temperature oven for 35 minutes. After removal, it is allowed to cool naturally until the surface temperature does not exceed 40℃.

[0080] After cooling, the copper-colored and tin-colored patterned areas were re-inspected. No cracks wider than 0.10 mm were found in the cured metal composite inlay, and the edge lifting height was no more than 0.05 mm.

[0081] 8. Gold Powder Composite Embedding and Curing The gold pattern area was brushed again with a soft brush and vacuumed under negative pressure to press the gold powder composite inlay into the corresponding non-dovetail fine pattern groove.

[0082] Preheat the oven to 180℃. Place the clay body inside and start timing when the oven temperature returns to 180℃±3℃. Bake for 20 minutes.

[0083] After baking, the purple clay body is left to stand in the constant temperature oven for 30 minutes, then removed and allowed to cool naturally to room temperature.

[0084] The temperatures of 210℃, 200℃, 190℃, and 180℃ mentioned above are the baking and curing temperatures used for copper powder composite inserts, tin powder composite inserts, silver powder composite inserts, and gold powder composite inserts in this group of processes, respectively. These temperatures do not indicate that the metal powders melt. During the baking process, the metal powders remain in a granular state, while the natural lacquer system forms a solidified phase upon heating. The metal powders remain within the corresponding non-dovetail fine pattern grooves along with the solidified phase.

[0085] 9. Trimming, sanding, and polishing After all the metal pattern areas have cured and cooled, remove any remaining cured material from the outside of the groove along the pattern lines.

[0086] The exposed surfaces of the tin powder composite inlay, copper powder composite inlay, silver powder composite inlay, and gold powder composite inlay were polished using 1000-grit abrasive. After polishing one type of metal pattern area, the abrasive residue was removed before processing the next metal pattern area.

[0087] Then, 2000-grit abrasive was used for initial polishing, followed by 3000-grit abrasive for simultaneous polishing of the exposed surfaces of each metal composite inlay and the surfaces of adjacent purple clay blanks.

[0088] 10. Finished Product Inspection Four types of metal pattern areas were observed using a 20x magnifying glass. The dimensions of missing sections, cracks, and foreign metal residues were measured using a graduated micrometer. The height difference between the exposed surface of the metal composite inlay and the surface of the adjacent purple clay body was measured using a digital depth gauge.

[0089] The tin-colored, copper-colored, silver-colored, and gold-colored patterned areas all form continuous metal composite inlays, and no gaps longer than 0.30 mm are found in any of the areas.

[0090] After repeated heating, no cracks with a width greater than 0.10mm appeared in the copper-colored pattern area and the tin-colored pattern area that had been cured first, and the edge lifting height was no more than 0.05mm.

[0091] No residues of dissimilar metal powder composite inserts with a continuous length greater than 0.50 mm and a width greater than 0.15 mm were found in the purple clay substrate interval area between adjacent metal pattern areas.

[0092] The height difference between the exposed surface of each metal composite inlay and the surface of the adjacent purple clay body is no greater than 0.05 mm. The surface of the purple clay vase features text, floral patterns, and decorative border designs composed of tin, gold, silver, and copper colors.

[0093] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A process for forming ultra-fine patterns using tin powder composite fusion in purple clay pottery, characterized in that, include: S1. Obtain a purple clay blank and a target tin-inlay pattern. Form a non-dovetail fine pattern groove on the surface of the purple clay blank according to the pattern lines of the target tin-inlay pattern. The non-dovetail fine pattern groove extends along the pattern lines and does not have a dovetail buckle structure for mechanically holding the metal inlay. S2. Mix tin powder, natural lacquer and thinner to form a paste-like tin powder composite insert; S3. Press the tin powder composite insert into the non-dovetail fine pattern groove. The tin powder composite insert is continuously distributed along the non-dovetail fine pattern groove and adheres to the groove wall to form a tin-inserted layer to be cured. S4. Place the purple ceramic blank with the tin-embedded layer to be cured in a constant temperature oven for baking and curing, so that the tin-embedded layer to be cured is cured in situ in the non-dovetail fine pattern groove to form a tin powder composite inlay. S5. Trim, grind and polish the surface of the purple clay blank with the tin powder composite inlay to obtain the finished purple clay inlaid with tin.

2. The process for forming ultra-fine patterns with tin powder composite fusion in purple clay pottery according to claim 1, characterized in that: The groove opening width of the non-dovetail fine pattern groove is not less than the groove bottom width, and the groove wall of the non-dovetail fine pattern groove does not form an inverted surface from the groove opening to the groove bottom where the groove bottom is wider than the groove opening.

3. The process for forming ultra-fine patterns with tin powder composite fusion in purple clay pottery according to claim 1, characterized in that: Before filling, the non-dovetail fine pattern groove is cleaned of floating dust. The cleaning of floating dust in the groove includes brushing the non-dovetail fine pattern groove with a soft brush along the pattern lines, and moving the negative pressure dust suction port along the non-dovetail fine pattern groove to remove floating dust and debris in the non-dovetail fine pattern groove. The cleaning of floating dust in the groove does not include cleaning with acidic cleaning solution, stearic acid melting or rosin melting.

4. The process for forming ultra-fine patterns with tin powder composite fusion in purple clay pottery according to claim 1, characterized in that: The tin powder is tin powder with a tin content of not less than 99.9%, and the particle size of the tin powder is 300 mesh to 800 mesh.

5. The process for forming ultra-fine patterned tin powder composites in purple clay pottery according to claim 1, characterized in that: The diluent is used to adjust the viscosity of the natural lacquer, and the mass ratio of the diluent to the natural lacquer is 1.5:1 to 2.5:

1.

6. The process for forming ultra-fine patterned tin powder composites in purple clay pottery according to claim 1, characterized in that: The tin powder composite insert is compacted in sections at the turning and intersecting positions of the pattern lines to form multiple compacted sections, and the ends of adjacent compacted sections overlap each other.

7. The process for forming ultra-fine patterns with tin powder composite fusion in purple clay pottery according to claim 1, characterized in that: The baking temperature for curing is 180℃-220℃, and the baking time is 15min-30min. After baking, the purple clay body is not removed from the constant temperature oven, but is kept at a constant temperature for 30min-60min.

8. The process for forming ultra-fine patterned tin powder composites in purple clay pottery according to claim 1, characterized in that: The trimming, grinding, and polishing processes sequentially include: after the tin powder composite inlay cools, trimming the solidified residue exposed outside the groove of the non-dovetail fine pattern along the pattern lines; grinding the exposed surface of the tin powder composite inlay with 800-1200 grit abrasive material; and simultaneously polishing the exposed surface of the tin powder composite inlay and the surface of the adjacent purple clay body with 1500-3000 grit abrasive material.

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