A ball milling tank, a ball milling device and application thereof

Abstract

The application relates to the technical field of powder processing, and discloses a ball milling tank, a ball milling device and application thereof. The ball milling tank comprises A, B and C three types of channel structures; two ends of the A, B or C channel are respectively provided with a feeding port and a discharging port; a central part of the device is provided with the A channel; the B channel is arranged around the A channel in the central part of the ball milling tank; the C channel is connected with the inner wall of the ball milling tank; the A channel is alternately provided with a high-throwing area with high vertical height and a low-throwing area with low vertical height along the axial direction; the B channel is alternately provided with the low-throwing area with low vertical height and the high-throwing area with high vertical height along the axial direction; the C channel is alternately provided with a high-clamping area formed by the low-throwing area and the inner wall of the ball milling tank and a low-clamping area formed by the high-throwing area and the inner wall of the ball milling tank along the axial direction; and the ratio of the vertical heights of the high-throwing area and the low-throwing area is (1.33-2):1.

Description

Technical Field

[0001] This invention relates to the field of powder processing technology, and in particular to a ball mill jar, ball milling equipment, and their applications. Background Technology

[0002] Ceramic substrates are widely used in the electronics and information industry for integrated circuit packaging, LED lighting, heat dissipation substrates, and other fields due to their advantages such as high temperature resistance, high electrical insulation performance, low dielectric loss, good chemical stability, and good processing performance.

[0003] To better realize the application of ceramic substrates in the aforementioned fields and obtain ceramic substrates with better mechanical strength, it is necessary to modify or process the raw material powders used in their preparation to improve the dispersibility, particle size distribution, and uniformity of the ceramic powders. Existing technologies typically use ball mills to crush and grind ceramic powders. This process involves mixing the grinding media with the powder material, followed by collision and friction under centrifugal force and gravity to complete the crushing process and refine the particle size.

[0004] However, in the actual process of modifying or processing powders, the ball milling efficiency is greatly affected by the powder's grinding ratio (the ratio of particle size before and after grinding) and the type of powder. Existing ball milling methods can only grind single powders with a large grinding ratio. The simple and limited internal shape and grinding structure of the ball mill cannot achieve simultaneous grinding and refining of powders with multiple different particle sizes. Moreover, the mixing efficiency decreases with the addition of powder during continuous operation. Especially for composite powders (such as zirconia toughened alumina powder, ZTA), the overall grinding efficiency and grinding quality are poor, making it difficult to obtain ultrafine ceramic powders with high purity, high dispersibility, and uniform particle size. Summary of the Invention

[0005] This invention aims to at least solve one of the aforementioned technical problems existing in the prior art. To this end, one objective of this invention is to provide a ball mill jar that, through a multi-channel and channel-partitioned design, allows the channels to have different structures, with each channel having a feed inlet and a discharge outlet. This enables the ball mill jar to simultaneously grind different types and particle sizes of raw material powders, achieving the grinding requirements of each powder while ensuring purity, thereby improving the grinding quality and efficiency after discharge. A second objective of this invention is to provide a ball milling device. A third objective of this invention is to provide a method for processing composite powders. A fourth objective of this invention is to provide applications of the ball mill jar, the ball milling device, or the method for processing composite powders.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A first aspect of the present invention provides a ball mill jar, comprising three structural types of channels: A, B, and C;

[0008] The A, B, or C channels are respectively provided with an inlet and an outlet at both ends;

[0009] The ball mill jar has a channel A in the center;

[0010] The B channel is arranged around the A channel at the center of the ball mill jar;

[0011] The C channel is connected to the inner wall of the ball mill jar;

[0012] The A channel is alternately provided with a high-throw zone with a relatively high vertical height and a low-throw zone with a relatively low vertical height along the axial direction; the inlet and outlet of the A channel are both connected to the high-throw zone.

[0013] The B channel is alternately provided with a low-throw zone with a lower vertical height and a high-throw zone with a higher vertical height along the axial direction; the inlet and outlet of the B channel are both connected to the low-throw zone.

[0014] The C channel is alternately provided with a high clamping area formed by the low-throwing area and the inner wall of the ball mill jar, and a low clamping area formed by the high-throwing area and the inner wall of the ball mill jar along the axial direction;

[0015] The ratio of the vertical height of the high-throw zone to the low-throw zone is (1.33-2):1.

[0016] Preferably, the ratio of the vertical height of the high-throw zone to the low-throw zone is (1.7-2):1.

[0017] Specifically, if the height difference between the high-throw zone and the low-throw zone is too small, the collision force generated by the height difference of the material during the overall grinding process is insufficient to achieve high-precision fine crushing, resulting in poor grinding efficiency and quality. If the height difference between the high-throw zone and the low-throw zone is too large, the material will have difficulty entering the next low-throw zone after being ground in the high-throw zone, causing the powder to accumulate at the bottom of the high-throw zone. The greater the height difference or the smaller the particle size of the powder, the more serious the accumulation problem becomes, severely reducing the grinding efficiency.

[0018] Preferably, the B channel and the A channel are alternately arranged around the A channel located in the center of the ball mill jar.

[0019] Preferably, the ratio of the horizontal axial length to the vertical height of the ball mill jar is (0.49-1.62):1; more preferably, the ratio of the horizontal axial length to the vertical height of the ball mill jar is (0.9-1.1):1.

[0020] Preferably, the grinding jar has a cylindrical structure.

[0021] Specifically, if the ratio of the horizontal axial length to the vertical height of the ball mill jar is too small, that is, the ball mill jar body is too tall, then the horizontal axial distance between the effective grinding zones (high-polish zone and low-polish zone) inside is too small, which is not conducive to the full refinement of the powder and the feeding and discharging of the powder; if the ratio of the axial length to the vertical height is too large, that is, the ball mill jar body is too long, but the height is not enough, then the vertical height of the high-polish zone of the grinding channel will be insufficient, the degree of powder refinement will be small, and the overall grinding efficiency will be low.

[0022] Preferably, the ratio of the number of channels A, B, and C is (1+2N):2(N+1):2, where N is an integer greater than or equal to 0.

[0023] Preferably, the ratio of the horizontal axial length of the ball mill jar to the sum of the horizontal axial lengths of the high-impact zone is (1.33-2):1; more preferably, the ratio of the horizontal axial length of the ball mill jar to the sum of the horizontal axial lengths of the high-impact zone is (1.7-2):1.

[0024] Specifically, if the ratio of the horizontal axial length of the ball mill jar to the sum of the horizontal axial lengths of the high-polishing zones is too large (i.e., the number of high-polishing zones is too small or the horizontal axial length of each high-polishing zone is too short, the number of low-polishing zones is too large or the horizontal axial length of each low-polishing zone is too long), the powder fineness will be low, resulting in a decrease in grinding efficiency and quality. Conversely, if the ratio of the horizontal axial length of the ball mill jar to the sum of the horizontal axial lengths of the high-polishing zones is too small (i.e., the number of high-polishing zones is too large or the horizontal axial length of each high-polishing zone is too long, the number of low-polishing zones is too small or the horizontal axial length of each low-polishing zone is too short), the area of ​​the low-polishing zones will be too small. Under the action of centrifugal force and the mass of the powder itself, large particles will preferentially aggregate in the high-polishing zones, while small particles will aggregate in the low-polishing zones, resulting in a decrease in dispersion and uniformity. This will prevent the continuous and uniform mixing and grinding between the high-polishing and low-polishing zones from achieving the desired effect, thus reducing powder processing efficiency and quality.

[0025] Preferably, the cross-sectional shape of the high-throw zone in the horizontal axis includes one of a rectangle and a circular arc.

[0026] Preferably, the ratio of the vertical height of the high clamping area to the low clamping area is (1.1-1.8):1; more preferably, the ratio of the vertical height of the high clamping area to the low clamping area is (1.5-1.8):1.

[0027] Specifically, if the ratio of the vertical height of the high-angled area to the low-angled area is too low or too high, the impact trend is the same as that caused by changes in the ratio of the vertical height of the high-throw area and the low-throw area.

[0028] Preferably, the feed inlet is located at the top vertically at one end of channel A, B, or C; and the discharge outlet is located at the bottom vertically at the other end of channel A, B, or C.

[0029] Preferably, the interior of the high-throw zone and / or low-throw zone is provided with a protruding structure; the protruding structure may be at least one of a cylinder, ellipsoid, prism, pyramid, or frustum.

[0030] Preferably, the height of the protrusion structure is 1-3 cm.

[0031] Preferably, the channel wall has a hollow structure, and during the grinding process, cold water can be circulated into the hollow structure of the channel wall to cool it down. The vertical height of the ball mill jar, the vertical height of the high-throw zone and the low-throw zone, and the vertical height of the high clamping zone and the low clamping zone are all the actual spatial height inside the channel, and the thickness of the hollow structure of the channel wall is negligible by default.

[0032] A second aspect of the present invention provides a ball milling apparatus including the ball milling jar described in the first aspect of the present invention.

[0033] A third aspect of the present invention provides a method for processing composite powders, comprising grinding powder raw materials using a ball mill jar as described in the first aspect of the present invention, or a ball milling device as described in the second aspect of the present invention.

[0034] Preferably, the powder raw materials are of 3-5 types.

[0035] Preferably, the particle size of the powder raw material is 0.3-100μm; more preferably, the particle size of the powder raw material is 0.5-50μm.

[0036] Preferably, the processing time is 300-500 min; more preferably, the processing time is 300-480 min.

[0037] Preferably, the method specifically includes the following steps: placing the raw materials of the composite powder in different channels, adding ball milling media and grinding aid, and ball milling.

[0038] Preferably, the feeding channels for the raw materials are determined based on the actual particle size of the raw materials, and channels A, B and C are selected in descending order of particle size.

[0039] Specifically, the powder raw material with a particle size greater than 50 μm and less than or equal to 100 μm is preferably placed in channel A; the powder raw material with a particle size greater than 40 μm and less than or equal to 50 μm is preferably placed in channel B; the powder raw material with a particle size greater than or equal to 0.3 μm and less than or equal to 40 μm is preferably placed in channel C.

[0040] Preferably, the particle size of the ball milling media is 10-15 mm.

[0041] Preferably, in each channel, the mass ratio of the grinding media, raw materials, and grinding aid is (15-25):(5-15):1; more preferably, in each channel, the mass ratio of the grinding media, raw materials, and grinding aid is (18-22):(8-12):1.

[0042] Preferably, the grinding aid comprises at least one of sodium dodecylbenzenesulfonate (SDBS), propylene glycol (PG), and triethanolamine (TEOA).

[0043] Preferably, the rotational speed of the ball mill is 2500-3500 r / min; more preferably, the rotational speed of the ball mill is 2800-3200 r / min.

[0044] Preferably, the method further includes using a ball milling solvent; the ball milling solvent includes anhydrous ethanol.

[0045] The fourth aspect of the present invention provides the application of the ball milling jar described in the first aspect, the ball milling equipment described in the second aspect, or the composite powder processing method described in the third aspect in the preparation of ceramic substrates.

[0046] Preferably, the ceramic substrate comprises a zirconia-toughened alumina (ZTA) substrate.

[0047] Preferably, the powder raw materials of the zirconia toughened alumina (ZTA) substrate include 3Y-ZrO2, silicon dioxide, calcium oxide, magnesium oxide and aluminum oxide.

[0048] Preferably, the zirconia toughened alumina (ZTA) substrate powder raw materials are placed in different channels for ball milling, and the milled powder is made into ceramic slurry, which is then cast, shaped, debinded, and sintered to obtain the ceramic substrate.

[0049] For example, when the ball mill jar described in the first aspect of the present invention, the ball milling equipment described in the second aspect, or the composite powder processing method described in the third aspect are used to process powder raw materials for ZTA substrates and to prepare ZTA substrates, the particle size of the 3Y-ZrO2 is 0.3-0.7 μm; the particle size of the silicon dioxide is 45-50 μm; the particle size of the calcium oxide is 35-40 μm; the particle size of the magnesium oxide is 45-50 μm; and the particle size of the aluminum oxide is 55-60 μm. The aluminum oxide is placed in channel A; the silicon dioxide and magnesium oxide are placed in channel B; and the 3Y-ZrO2 and calcium oxide are placed in channel C.

[0050] Compared with the prior art, the beneficial effects of the present invention are:

[0051] 1) The ball mill jar provided by the present invention contains three types of channels with different structures, which can realize the synchronous grinding of various powder raw materials. By dividing the channels into sections, the structure of alternating high-throw zone-low-throw zone-high-throw zone, low-throw zone-high-throw zone-low-throw zone, and high-clamping zone-low-clamping zone can increase the collision force and dispersion of materials based on height difference, thereby achieving high-precision fine crushing and improving grinding efficiency and grinding quality.

[0052] 2) The ball milling equipment provided by this invention can grind multiple powder raw materials simultaneously, with high ball milling efficiency and quality.

[0053] 3) The composite powder processing method provided by the present invention can process multiple powder raw materials simultaneously, and the output powder has a small average particle size and high purity.

[0054] 4) The ball mill jar, ball milling equipment and composite powder processing method provided by the present invention can be applied to the preparation of ceramic substrates, which can provide high-quality processed powders and the resulting ceramic substrates have high strength. Attached Figure Description

[0055] Figure 1 The diagram shows the internal structure of the channel on the yz section of the ball mill jar in Examples 1-18 and Comparative Examples 1-2, where 1 is the feed inlet and 2 is the discharge outlet.

[0056] Figure 2 The diagram shows the internal and overall dimensions of the channel on the yz section of the ball mill jar in Examples 1-18 and Comparative Examples 1-2. In the diagram, a is the vertical height of the low-throw zone, b is the vertical height of the high-throw zone, c is the vertical height of the high-clamping zone, d is the vertical height of the low-clamping zone, X is the horizontal axial length of the ball mill jar, Y is the vertical height of the ball mill jar, x1-x3 are the axial lengths of individual high-throw zones, and x is the sum of the horizontal axial lengths of the high-throw zones.

[0057] Figure 3 This is a schematic diagram of the shape of the high-polish zone on the yz section of the ball mill jar in Examples 1-18 and Comparative Examples 1-2;

[0058] Figure 4 This is a schematic diagram of the shape of the protruding structure inside the channel on the yz section of the ball mill jar in Examples 1-18 and Comparative Examples 1-2;

[0059] Figure 5 These are schematic diagrams of the overall structure of the ball milling equipment in Examples 1-18 and Comparative Examples 1-2;

[0060] Figure 6 The diagram shows the internal structure of the channel on the yz section of the ball mill equipment in Examples 1-18 and Comparative Examples 1-2, where 1 is the feed inlet and 2 is the discharge outlet.

[0061] Figure 7This is a schematic diagram of the feed inlet side of the ball mill equipment on the xz section in Examples 1-18 and Comparative Examples 1-2, where 1 is the feed inlet;

[0062] Figure 8 This is a schematic diagram of the discharge port side of the ball mill equipment in Examples 1-18 and Comparative Examples 1-2, where 2 is the discharge port;

[0063] Figure 9 This is a schematic diagram of the internal structure of the channel on the yz section of the ball mill jar in Comparative Example 3;

[0064] Figure 10 This is a schematic diagram of the internal structure of the channel on the yz section of the ball mill jar in Comparative Example 4. Detailed Implementation

[0065] The present invention will be further described in detail below through specific embodiments. Unless otherwise specified, the raw materials, reagents, or apparatus used in the embodiments and comparative examples are all available from conventional commercial sources or can be obtained by existing technical methods. Unless otherwise specified, the test or experimental methods are conventional methods in the art.

[0066] Figure 1-8 These are, respectively, schematic diagrams of the internal structure of the channel on the yz section of the ball mill jar in Examples 1-18 and Comparative Examples 1-2; schematic diagrams of the internal and overall dimensions of the channel on the yz section of the ball mill jar in Examples 1-18 and Comparative Examples 1-2; schematic diagrams of the shape of the high-throw zone on the yz section of the ball mill jar in Examples 1-18 and Comparative Examples 1-2; schematic diagrams of the shape of the protruding structure inside the channel on the yz section of the ball mill jar in Examples 1-18 and Comparative Examples 1-2; schematic diagrams of the overall structure of the ball mill equipment in Examples 1-18 and Comparative Examples 1-2; schematic diagrams of the internal structure of the channel on the yz section of the ball mill equipment in Examples 1-18 and Comparative Examples 1-2; schematic diagrams of the feed inlet side on the xz section of the ball mill equipment in Examples 1-18 and Comparative Examples 1-2; and schematic diagrams of the discharge port side on the xz section of the ball mill equipment in Examples 1-18 and Comparative Examples 1-2. See below for reference. Figure 1-8 Examples 1-18 and Comparative Examples 1-2 of the present invention are described.

[0067] Figure 1The diagram shows the internal structure of the channels in the yz section of the grinding jar in Examples 1-18 and Comparative Examples 1-2. The grinding jar is a cylindrical jar with a rectangular yz section. The grinding jar includes three types of channels: A, B, and C, with a ratio of 1:2:2. Channel A is located on the horizontal central axis of the grinding jar. Channel B is located around channel A (including channel B1 located above channel A and channel B2 located below channel A). Channel C is located around channel B and connected to the inner wall of the grinding jar (including channel C1 located above channel B1 and channel C2 located below channel B2). Channel C2); Channel A is provided with a high-thrust zone with a higher vertical height and a low-thrust zone with a lower vertical height along the horizontal axis. The inlet (1) and outlet (2) of Channel A are both connected to the high-thrust zone; Channels B1 and B2 are provided with a low-thrust zone with a lower vertical height and a high-thrust zone with a higher vertical height along the horizontal axis. The inlet (1) and outlet (2) of Channels B1 and B2 are both connected to the low-thrust zone; Channels C1 and C2 are provided with a high clamping zone formed by the low-thrust zone and the inner wall of the ball mill jar, and a low clamping zone formed by the high-thrust zone and the inner wall of the ball mill jar, respectively, along the horizontal axis. Each of the above channels is provided with a corresponding inlet and outlet; the inlet is located at the top vertically on one side of the channel; the outlet is located at the bottom vertically on the other side of the channel.

[0068] Figure 2 This is a schematic diagram of the internal dimensions of the channel on the yz section of the ball mill jar in Examples 1-18 and Comparative Examples 1-2, where a is the vertical height of the low-throw zone, b is the vertical height of the high-throw zone, c is the vertical height of the high-clamping zone, d is the vertical height of the low-clamping zone, X is the horizontal axial length of the ball mill jar, Y is the vertical height of the ball mill jar, x1-x3 are the axial lengths of individual high-throw zones, and x is the sum of the horizontal axial lengths of the high-throw zones (x = x1 + x3). 2+ x3).

[0069] Figure 3 These are schematic diagrams showing the shape of the high-polish zone on the yz section of the ball mill jar in Examples 1-18 and Comparative Examples 1-2. The shape of the high-polish zone on the yz section may include a rectangle. Figure 3 (a)) and arc-shaped ( Figure 3 (b)).

[0070] Figure 4 The diagram shows the shape of the protruding structure inside the channel on the yz section of the ball mill jar in Examples 1-18 and Comparative Examples 1-2. When a protruding structure is provided inside the channel, its shape may include a cylinder. Figure 4 (a)), frustum ( Figure 4 (b) ), pyramid ( Figure 4 (c) and ellipsoid ( Figure 4 (d)).

[0071] Figure 5The diagram shows the overall structure of the ball milling equipment in Examples 1-18 and Comparative Examples 1-2.

[0072] Figure 6 The diagram shows the internal structure of the channel in the yz section of the ball milling equipment in Examples 1-18 and Comparative Examples 1-2. It can be seen that the ball milling equipment includes... Figure 1 The shown grinding jar includes channels A, B1, B2, C1, and C2.

[0073] Figure 7 This is a schematic diagram of the feed inlet side of the xz section of the ball mill equipment in Examples 1-18 and Comparative Examples 1-2.

[0074] Figure 8 The diagram shows the discharge port side of the ball mill equipment xz section in Examples 1-18 and Comparative Examples 1-2. It can be seen that each channel is provided with a feed port (1) and a discharge port (2). The feed port (1) is located at the top vertically at one end of channel A, B1, B2, C1 or C2, and the discharge port (2) is located at the bottom vertically at the other end of channel A, B1, B2, C1 or C2.

[0075] Example 1

[0076] In this embodiment, the structural schematic diagram of the ball mill jar and ball milling equipment is as follows: Figure 1-8 As shown, specifically, the horizontal axial length X and vertical height Y of the grinding jar are both 232cm, X:Y = 1; the vertical height a of the low-throw zone is 40cm, and the vertical height b of the high-throw zone is 68cm, with a ratio of b:a = 1.7; the sum of the axial lengths of the high-throw zone x is 123cm, and the ratio of the horizontal axial length X of the grinding jar to the sum of the horizontal axial lengths x of the high-throw zone x is X:x = 1.7; the vertical height c of the high-clamping zone is 42cm, and the vertical height d of the low-clamping zone is 28cm, with a ratio of c:d = 1.5. The channel wall is a hollow pipe structure, and cold water can be circulated through the hollow structure of the channel wall for cooling during the grinding process. The vertical height described here refers to the actual internal space height of the channel, and the thickness of the hollow structure of the channel wall is negligible by default. In this embodiment, the shape of the high-throw zone on the yz section of the grinding jar is rectangular (…). Figure 3 (a)); No protruding structures are provided inside the channel.

[0077] ZTA powder raw materials were processed using this ball mill equipment. The types, contents, and original particle sizes of the raw materials are shown in Table 1.

[0078] Table 1. Types, contents, and original particle size of ZTA powder raw materials

[0079] Types of raw materials <![CDATA[3Y-ZrO2]]> silicon dioxide Calcium oxide magnesium oxide Alumina Mass ratio (wt%) 7.0 0.23 0.05 0.1 92.62 Original particle size (D50) 0.5μm 50μm 40μm 50μm 55μm

[0080] Alumina was added to channel A, silica and magnesium oxide to channels B1 and B2 respectively, and 3Y-ZrO2 and calcium oxide to channels C1 and C2 respectively. Alumina ceramic balls with a particle size of 10-15 mm were used as the milling media, and sodium dodecylbenzenesulfonate (SDBS) was used as the grinding aid. The mass ratio of milling media, powder raw material and grinding aid in each channel was 20:10:1. The milling speed was 3000 r / min, and anhydrous ethanol was used as the milling solvent. The milling time was recorded, and the average particle size of the powder was measured. The ground powder was made into ceramic slurry, which was then cast, shaped, debinded and sintered to obtain a ceramic substrate. The strength of the substrate was measured.

[0081] Example 2

[0082] The difference between this embodiment and Embodiment 1 is that the ratio of the vertical height of the high-throw zone to the low-throw zone is b:a = 1.33.

[0083] Example 3

[0084] The difference between this embodiment and Embodiment 1 is that the ratio of the vertical height of the high-throw zone to the low-throw zone is b:a = 2.

[0085] Example 4

[0086] The difference between this embodiment and Embodiment 1 is that the ratio of the horizontal axial length X of the ball mill jar to the sum of the horizontal axial lengths x of the high-throw zone is X:x = 1.33.

[0087] Example 5

[0088] The difference between this embodiment and Embodiment 1 is that the ratio of the horizontal axial length X of the ball mill jar to the sum of the horizontal axial lengths x of the high-throw zone is X:x = 2.

[0089] Example 6

[0090] The difference between this embodiment and Embodiment 1 is that the ratio of the horizontal axial length X of the ball mill jar to its vertical height Y is X:Y = 0.49.

[0091] Example 7

[0092] The difference between this embodiment and Embodiment 1 is that the ratio of the horizontal axial length X of the ball mill jar to its vertical height Y is X:Y = 1.62.

[0093] Example 8

[0094] The difference between this embodiment and Embodiment 1 is that the ratio of the horizontal axial length X of the ball mill jar to its vertical height Y is X:Y = 0.5.

[0095] Example 9

[0096] The difference between this embodiment and Embodiment 1 is that the ratio of the horizontal axial length X of the ball mill jar to its vertical height Y is X:Y = 1.6.

[0097] Example 10

[0098] The difference between this embodiment and Embodiment 1 is that the ratio of the vertical height of the high clamping area to the low clamping area is c:d = 1.1.

[0099] Example 11

[0100] The difference between this embodiment and Embodiment 1 is that the ratio of the vertical height of the high clamping area to the low clamping area is c:d = 1.8.

[0101] Example 12

[0102] The difference between this embodiment and Embodiment 1 is that the ratio of the vertical height of the high clamping area to the low clamping area is c:d = 1.2.

[0103] Example 13

[0104] The difference between this embodiment and Embodiment 1 is that the ratio of the vertical height of the high clamping area to the low clamping area is c:d = 1.7.

[0105] Example 14

[0106] The difference between this embodiment and Embodiment 1 is that the cross-sectional shape of the yz section in the high-throw zone of the ball mill jar is arc-shaped. Figure 3 (b)).

[0107] Example 15

[0108] The difference between this embodiment and Embodiment 1 is that a cylindrical protrusion structure is provided inside the ball mill jar channel. Figure 4 (a)).

[0109] Example 16

[0110] The difference between this embodiment and Embodiment 1 is that a frustum-shaped protrusion structure is provided inside the ball mill jar channel. Figure 4 (b)).

[0111] Example 17

[0112] The difference between this embodiment and Embodiment 1 is that a pyramidal protrusion structure is provided inside the ball mill jar channel. Figure 4 (c)).

[0113] Example 18

[0114] The difference between this embodiment and Embodiment 1 is that an ellipsoidal protrusion structure is provided inside the ball mill jar channel. Figure 4 (d)).

[0115] Comparative Example 1

[0116] The difference between this comparative example and Example 1 is that the ratio of the vertical height of the high-throw zone to the low-throw zone is b:a = 1.

[0117] Comparative Example 2

[0118] The difference between this comparative example and Example 1 is that the ratio of the vertical height of the high-throw zone to the low-throw zone is b:a = 2.5.

[0119] Comparative Example 3

[0120] The difference between this comparative example and Example 1 is that the channel is not divided into high-throw and low-throw zones. Figure 9 This is a schematic diagram of the internal structure of the channel on the yz section of the ball mill jar in Comparative Example 3. Figure 9 It can be seen that there are five channels inside the ball mill jar, and the vertical height of each channel is 46.4 cm.

[0121] Comparative Example 4

[0122] The difference between this comparative example and Example 1 is that the channel is not divided into high-throw and low-throw zones. Figure 10 This is a schematic diagram of the internal structure of the channel on the yz section of the ball mill jar in Comparative Example 4. Figure 10 It can be seen that there are seven channels inside the ball mill jar, and the vertical height of each channel is 33.1 cm.

[0123] The parameters of the ball mill jars in Examples 1-18 and Comparative Examples 1-2 are summarized in Table 2 below.

[0124] Table 2. Parameters of the milling jars in Examples 1-18 and Comparative Examples 1-4

[0125]

[0126]

[0127] The ball milling time, average particle size of the powder at discharge, and strength of the prepared ceramic substrate were recorded in Examples 1-18 and Comparative Examples 1-4. The relevant methods and standards are shown in Table 3.

[0128] Table 3 Performance Test Contents and Standards

[0129]

[0130] Note: The above standards are relative standards given as an example of untreated powder with a particle size of D50.

[0131] The ball milling time, average particle size of powder (taking alumina as an example), and substrate strength test results of Examples 1-18 and Comparative Examples 1-4 are shown in Table 4.

[0132] Table 4. Test results of ball milling time, average particle size, and substrate strength in Examples 1-18 and Comparative Examples 1-4.

[0133]

[0134]

[0135] Table 4 shows the ball milling time, average particle size of powder, and substrate strength test results for Examples 1-18 and Comparative Examples 1-4. As can be seen from Table 4, the ball milling time required to achieve the corresponding powder grinding requirements in Examples 1-13 within the set b:a and X:x ratio range is 390-478 min, which is relatively short. The average particle size of alumina before grinding is 55 μm, and the average particle size after grinding within a fixed time (480 min) is within the range of 1.4-3.0 μm, which meets the standard of ≤3 μm discharge particle size. The powder grinding effect is good, and the strength of the ceramic substrate made from the ground powder can reach 799-837 MPa. The ceramic substrate has excellent strength performance, indicating that the ball milling jar and ball milling equipment provided by the present invention can provide high grinding efficiency and grinding quality, and have good application effect in the preparation of ceramic substrates.

[0136] Example 14 further optimized the shape of the high-polish zone. When the shape of the high-polish zone on the yz section of the ball mill jar is an arc, the grinding time can be further shortened (380 min), and powder with a smaller average particle size (1.3 μm) can be obtained.

[0137] Examples 15-18 further optimized the internal structure of the grinding channel by setting a protruding structure inside the channel, which shortened the ball milling time to 300-360 min and further reduced the average particle size of the powder to 0.7-1.4 μm. The strength of the prepared ceramic substrate can reach 872 MPa, indicating that by optimizing the internal structure of the channel, the grinding efficiency and quality were further improved, and a ceramic substrate with better performance was obtained.

[0138] In Comparative Examples 1-2, b:a was not within the parameter range. In Comparative Example 1, the height difference between the vertical height of the high-polishing zone and the low-polishing zone was too small. During the overall grinding process, the collision force generated by the height difference of the powder was insufficient to complete the high-precision fine crushing, resulting in excessively long ball milling time and a large average particle size of the powder, leading to poor substrate strength performance. In Comparative Example 2, the height difference between the vertical height of the high-polishing zone and the low-polishing zone was too large. After grinding in the high-polishing zone, the powder had difficulty entering the next low-polishing zone, causing the powder to accumulate at the bottom of the high-polishing zone. The greater the height difference or the smaller the particle size of the powder, the more serious the accumulation problem became, severely reducing the grinding efficiency.

[0139] In Comparative Examples 3-4, the channel structure provided by this invention was not used. Instead, a single-height channel structure was adopted, and the channel was not divided into a high-throw zone and a low-throw zone. This is similar to the single-channel structure of ball mill jars in the prior art. Because the high-throw zone and low-throw zone were not set, the powder collision force and dispersion were insufficient, the ball milling time was long, the average particle size of the powder was large, and the strength performance of the substrate was poor.

[0140] The ball milling jar and ball milling equipment provided by the present invention are based on a multi-channel design with multiple structural types. Within the parameter range provided by the present invention, they can simultaneously grind multiple powders. The ball milling time is short and the efficiency is high. The average particle size of the powder obtained is small. When used to prepare ceramic substrates, the resulting substrates have good strength properties.

Claims

1. A ball mill jar, characterized by, The channels include three types of structures A, B and C. The two ends of the A channel, the B channel or the C channel are respectively provided with a feeding port and a discharging port. The A channel is centrally arranged in the ball mill tank. The B channel is arranged around the A channel in the center of the ball mill tank. The C channel is connected with the inner wall of the ball mill tank. The A channel is alternately provided with a high-throwing zone with a higher vertical height and a low-throwing zone with a lower vertical height along the axial direction; the feeding port and the discharging port of the A channel are connected with the high-throwing zone. The B channel is alternately provided with a low-throwing zone with a lower vertical height and a high-throwing zone with a higher vertical height along the axial direction; the feeding port and the discharging port of the B channel are connected with the low-throwing zone. The C channel is alternately provided with a high-clamping zone formed by the low-throwing zone and the inner wall of the ball mill tank, and a low-clamping zone formed by the high-throwing zone and the inner wall of the ball mill tank along the axial direction. The ratio of the vertical height of the high-throwing zone to the low-throwing zone is (1.33-2):

1.

2. The ball mill jar of claim 1, wherein, The ratio of the horizontal axial length of the ball mill tank to the vertical height is (0.49-1.62):

1.

3. The ball mill jar of claim 1, wherein, The ratio of the sum of the horizontal axial length of the ball mill tank and the horizontal axial length of the high-throwing zone to the horizontal axial length of the high-throwing zone is (1.33-2):

1.

4. The ball mill jar of claim 1, wherein, The ratio of the vertical height of the high-clamping zone to the low-clamping zone is (1.1-1.8):

1.

5. The ball mill jar of claim 1, wherein, The feeding port is located at the uppermost position in the vertical direction at one end of the A channel, the B channel or the C channel, and the discharging port is located at the lowermost position in the vertical direction at the other end of the A channel, the B channel or the C channel.

6. A ball milling apparatus characterized by, The ball mill tank of any one of claims 1-5.

7. A method for processing a composite powder, characterized by, The ball mill tank of any one of claims 1-5.

8. A method for processing a composite powder, characterized by, The ball mill device of claim 6.

9. The ball mill tank of any one of claims 1-5 for use in the preparation of a ceramic substrate.

10. The ball mill device of claim 6 for use in the preparation of a ceramic substrate.

11. The method of claim 7 for use in the preparation of a ceramic substrate.

12. The method of claim 8 for use in the preparation of a ceramic substrate.

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