Method and device for manufacturing conductive particles

A manufacturing device for conductive fine particles comprising:

• a disk-shaped bottom plate secured to the upper end of a perpendicular driving shaft;
• a porous member that is placed on the outer circumferential upper face of the bottom plate and that comprises a plate shaped porous support and a sheet-shaped filter, affixed on inner side face of said support, having a thickness of 10 to 1000 μm with a pore size allowing only a plating solution to pass there through;
• a contact ring for conducting electricity placed on the upper face of the porous member;
• a hollow cover of a trapezoidal cone shape having an opening on an upper center portion thereof;
• a rotatable treatment chamber formed in a manner so as to sandwich the porous member and the contact ring, between the outer circumferential portion of the hollow cover and the bottom plate;
• a supply tube for supplying the plating solution to the treatment chamber through the opening;
• a container for receiving plating solution scattered from the pores of the porous member;
• a drain tube for draining the plating solution accumulated in the container;
• and
• an electrode inserted through the opening to contact the plating solution.

A manufacturing device for conductive fine particles comprising:

• a disk-shaped bottom plate secured to the upper end of a perpendicular driving shaft;
• a plate-shaped porous member that is placed on the upper face of the bottom plate and that allows only a plating solution to pass there through;
• a contact ring for conducting electricity placed on the upper face of the porous member;
• a hollow cover of a trapezoidal cone shape having an opening on an upper center portion thereof;
• a rotatable treatment chamber formed in a manner so as to sandwich the porous member and the contact ring, between the outer circumferential portion of the hollow cover and the bottom plate;
• a supply tube for supplying the plating solution to the treatment chamber through the opening;
• a container for receiving plating solution scattered from the pores of the porous member;
• a drain tube for draining the plating solution accumulated in the container;
• and
• an electrode inserted through the opening to contact the plating solution.

A manufacturing device for conductive fine particles comprising:

• a disk-shaped bottom plate secured to the upper end of a perpendicular driving shaft;
• a plate-shaped porous member that allows only a plating solution to pass there through and that is placed on the upper face of the bottom plate;
• a contact ring for conducting electricity placed on the upper face of the porous member;
• a hollow cover of a trapezoidal cone shape having an opening on an upper center portion thereof, wherein said opening has an opening diameter, to the upper end of which a hollow cylinder having the same pore diameter as the opening diameter is joined, with the upper end of the hollow cylinder being bent toward the inner wall side of the hollow cylinder;
• a rotatable treatment chamber formed in a manner so as to sandwich the porous member and the contact ring, between the outer circumferential portion of the hollow cover and the bottom plate;
• a supply tube for supplying the plating solution to the treatment chamber through the opening;
• a container for receiving plating solution scattered from the pores of the porous member;
• a drain tube for draining the plating solution accumulated in the container;
• and
• an electrode inserted through the opening to contact the plating solution.

A manufacturing method for conductive fine particles, which comprises loading pre-treated fine particles into a treatment chamber and carrying out a plating process by allowing the treatment chamber to rotate centered on its rotation axis while supplying a plating solution into the treatment chamber to form an electroplating layer on each of the fine particles,

• and applying at least one selected from the group consisting of a shearing force, an impact force and cavitation, in order to disperse, pulverize and divide into individual particles, aggregated lumps of fine particles formed during the plating process,
• wherein during the plating process, the fine particles are drawn continuously from the treatment chamber for the plating process, and are then subjected to the pulverizing process, and again returned to the treatment chamber;
• this operation is repeated until the completion of the plating process,
• wherein the plating process is performed with use of an electroplating device comprising:
• a disk-shaped bottom plate secured to the upper end of a perpendicular driving shaft;
• a porous member that is placed on the outer circumferential upper face of the bottom plate and that allows only a plating solution to pass there through;
• a contact ring for conducting electricity placed on the upper face of the porous member;
• a hollow cover of a trapezoidal cone shape having an opening on its upper center portion, wherein said opening has an opening diameter, to the upper end of which a hollow cylinder having the same pore diameter as the opening diameter is joined, with the upper end of the hollow cylinder being bent toward the inner wall side of the hollow cylinder;
• the rotatable treatment chamber formed in a manner so as to sandwich the porous member and the contact ring between the outer circumferential portion of the hollow cover and the bottom plate;
• a supply tube for supplying the plating solution to the treatment chamber through the opening;
• a container for receiving plating solution scattered from the pores of the porous member;
• a drain tube for draining the plating solution accumulated in the container;
• and an electrode inserted through the opening to contact the plating solution.

A manufacturing device for conductive fine particles comprising:

• a disk-shaped bottom plate secured to the upper end of a perpendicular driving shaft;
• a porous member that is placed on the outer circumferential upper face of the bottom plate and that allows only a treatment liquid to pass there through;
• a contact ring for conducting electricity placed on the upper face of the porous member;
• a hollow cover of a trapezoidal cone shape having an opening on an upper center portion thereof, wherein said opening has an opening diameter, to the upper end of which a hollow cylinder having the same pore diameter as the opening diameter is joined, with the upper end of the hollow cylinder being bent toward the inner wall side of the hollow cylinder being bent toward the inner wall side of the hollow cylinder;
• a rotatable treatment chamber formed in a manner so as to sandwich the porous member and the contact ring, between the outer circumferential portion of the hollow cover and the bottom plate;
• a supply tube for supplying the treatment liquid to the plating vessel through the opening;
• a container for receiving treatment liquid scattered from the pores of the porous member;
• a drain tube for draining the treatment liquid accumulated in the container;
• an electrode inserted through the opening to contact the plating solution, and a pulverizing device for applying at least one selected from the group consisting of a shearing force, an impact force and cavitation, in order to disperse, pulverize and divide into individual particles, aggregated lumps of fine particles formed during the plating process.

A manufacturing device for conductive fine particles comprising:

• a disk-shaped bottom plate secured to the upper end of a perpendicular driving shaft;
• a porous member that is placed on the outer circumferential upper face of the bottom plate and that allows only a plating solution to pass there through;
• a contact ring for conducting electricity placed on the upper face of the porous member;
• a hollow cover having an opening on its upper center portion;
• a rotatable plating vessel formed in a manner so as to sandwich the porous member and the contact ring between the outer circumferential portion of the hollow cover and the bottom plate;
• a treatment chamber, placed inside the plating vessel, that is formed with a partition plate for transmitting only a plating solution, and comprises the inside face of the contact ring;
• a supply tube for supplying the plating solution to the plating vessel through the opening;
• a container for receiving plating solution scattered from the pores of the porous member;
• a drain tube for draining the plating solution accumulated in the container;
• and
• an electrode inserted through the opening to contact the plating solution.

A manufacturing method for conductive fine particles for forming a plating layer on the surface of each of the fine particles by a plating process,

• wherein said plating process comprises a power application process for applying power with the fine particles contacting the cathode to form a plating layer on the surface of each of the fine particles and a stirring process for stirring the fine particles,
• wherein during the stirring process, no power is applied
• wherein said plating process is performed with use of a manufacturing device for conductive fine particles comprising;
• a rotatable treatment chamber that has a cathode on its side face and a porous member having larger pore size than that of a sheet-shaped filter having a thickness of 10 to 1000 μm with a pore size allowing only a plating solution to pass there through, said porous member being affixed to said sheet-shaped filter;
• and an anode placed in the treatment chamber so as not to contact the cathode, is carried out by repeating rotation and stoppage of the treatment chamber.

A manufacturing method for conductive fine particles for forming an electroplating layer on the surface of each of the fine particles by a plating process,

• wherein the plating process, using a manufacturing device for conductive fine particles that comprises;
• a rotatable treatment chamber that has a cathode on its side face and a porous member having larger pore size than that of a filter formed by affixing the sheet-shaped filter having a thickness of 10 to 1000 μm with a pore size allowing only a plating solution to pass there through;
• and an anode placed in the treatment chamber so as not to contact the cathode, comprises steps of applying power with the fine particles being made contact with the cathode by the effect of a centrifugal force caused by the rotation of the treatment chamber to form an electroplating layer on the surface of each of the fine particles, and stopping the rotation of the treatment chamber and the application of power, further repeating the rotation and stoppage of the treatment chamber, and
• the difference in gravity between the fine particles and the plating solution is set in the range of 0.04 to 22.00.

A manufacturing method for conductive fine particles for forming an electroplating layer on the surface of each of the fine particles by a plating process,

• wherein the plating process, using a manufacturing device for conductive fine particles which comprises;
• a rotatable treatment chamber that has a cathode on its side face and a porous member having larger pore size than that of a filter formed by affixing the sheet-shaped filter having a thickness of 10 to 1000 μm with a pore size allowing only a plating solution to pass there through;
• and an anode placed in the treatment chamber so as not to contact the cathode, comprises the steps of applying power with the fine particles being made contact with the cathode by the effect of a centrifugal force caused by the rotation of the treatment chamber, so as to form an electroplating layer on the surface of each of the fine particles, and stopping the rotation of the treatment chamber and the application of power, and repeating the rotation and stoppage of the treatment chamber, and
• the rotation of the treatment chamber is carried out with the number of revolutions so as to set the centrifugal effect at 2.0 to 40.0, the power application is started 0.5 to 10 seconds after the start of the rotation of the treatment chamber, and the time of stoppage of the treatment chamber is set to 0 to 10 seconds.

A manufacturing method for conductive fine particles for forming an electroplating layer on the surface of each of the fine particles by a plating process, wherein the plating process, using a manufacturing device for conductive fine particles that comprising;

• a rotatable treatment chamber that has a cathode on its side face and a porous member having larger pore size than that of a filter formed by affixing the sheet-shaped filter having a thickness of 10 to 1000 μm with a pore size allowing only a plating solution to pass there through;
• and an anode placed in the treatment chamber so as not to contact the cathode, comprises applying power with the fine particles being made contact with the cathode by the effect of a centrifugal force caused by the rotation of the treatment chamber to form an electroplating layer on the surface of each of the fine particles, and stopping the rotation of the treatment chamber and the application of power, and repeating the rotation and stoppage of the treatment chamber, and
• the rotation of the treatment chamber is carried out with a number of rotations so as to provide a centrifugal effect of 2.0 to 40.0, the power application is started 3 to 10 seconds after the rotation start of the treatment chamber before the film thickness of the electroplating layer formed on the surface of each of the fine particles has become a constant value, and after the film thickness of, the electroplating layer formed on the surface of each of the fine particles has become a constant value, the power application is started 0.5 to 10 seconds after the rotation start of the treatment chamber, and the starting time is earlier than the power application start time before the film thickness of the electroplating layer formed on the surface of each of the fine particles has become the constant value.