Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
  • B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
  • B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
  • B23Q3/06—Work-clamping means
  • B23Q3/08—Work-clamping means other than mechanically-actuated
  • B23Q3/086—Work-clamping means other than mechanically-actuated using a solidifying liquid, e.g. with freezing, setting or hardening means
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
  • B01L9/00—Supporting devices; Holding devices
  • B01L9/06—Test-tube stands; Test-tube holders
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
  • C08K3/013—Fillers, pigments or reinforcing additives
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N1/00—Sampling; Preparing specimens for investigation
  • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
  • G01N1/32—Polishing; Etching
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof

Definitions

• the present invention relates to means for preparing mountings for specimens to permit a scientific study thereof. More particularly, this invention is concerned with new and improved specimen mounting compositions, with new and improved methods for mounting, grinding, and polishing specimens contained in such mounting compositions, and with the new and improved specimen mounts provided by such compositions and methods.
• polishing operations provide a flat, scratch free, mirror like surface on the specimen. This is, of course, the required condition of the specimen before it may be chemically etched and the metallographic structure appropriately revealed.
• Another object of the present invention is to provide a new and improved specimen mounting composition.
• a further object of the present invention is to provide a new and improved method for mounting a specimen.
• Yet another object of the present invention is to provide a new and improved specimen mount.
• a new and improved specimen mounting composition comprising from about 10 to about 30 parts by weight of powdered abrasive material and from about to about 120 parts by weight of a curable resm.
• the new and improved method for mounting a specimen in accordance with the present invention comprises the steps of admixing from about 10 to about 30 parts by weight of a powdered abrasive material with from about 80 to about 120 parts by weight of a curable resin to form a homogeneousmixture, positioning the specimen in a receptacle, adding the mixture to the receptacle to envelop said specimen, and curing the resin to provide a solid matrix body containing the specimen.
• the new and improved method for preparing a specimen mount for observation in accordance with the present invention comprises the steps of admixing from about 10 to about 30 parts by weight of a powdered abrasive material with from about 80 to about 120 parts by weight of a curable resin to form a homogeneous mixture, positioning the specimen in a receptacle, adding the mixture to the receptacle to envelop the specimen, curing the resin to provide a solid matrix body containing the 'specimen, and grinding a surface of the solid matrix body to expose at least a portion of the. specimen.
• the new and novel mount of the present invention comprises a solid matrix body comprising from about 80 to about 120 parts by weight of a cured resinous material having dispersed therein from about 10 to about 30 parts by weight of an abrasive powder, and a specimen embedded in said solid matrix body.
• abrasive materials may be employed in accordance with the present invention.
• abrasive materials which are preferred in the grinding and polishing of metallographic specimens, how-' ever, are those having a Knoop hardness value of at least 900, such as, for example, chromia, zirconia, beryllia, topaz, garnet, tungsten carbide alloys, zirconium boride, titanium nitride, tungsten carbide, tantalum carbide, zirconium carbide, alumina, beryllium carbide, titanium carbide, silicon carbide, aluminum boride, boron carbide,
• the particle size of the powdered abrasive materials used in accordance with the present invention may vary within wide limits. However, abrasive powders having a particle size of mesh or less have generally proven to be satisfactory in the preparation of most metallographic specimens with particles of less than 0.1 micron in size being preferred.
• the curable resin used in accordance with the present invention may, in general, comprise any resinous material capable of being cured into a solid, thermosetting mass.
• epoxy materials having the grouping Examples of such resins are given in US. Patents 2,324,- 483 and 2,444,333 to Castan, and British Patents 518,087 and 579,698.
• the epoxy resins described therein are the reaction products of an epihalohydrin such as epichlorohydrin and a phenol having at least two phenolic hydroxy groups such as bis-(4-hydroxyphenol)- 2,2-propane.
• US. Patents 2,494,295 to Greenlee, 2,500,- 600 to Bradley, and 2,,511,9l3 to Greenlee further describe epoxy resins which may be used in conjunction With the present invention.
• the epoxy resins used therein have more than one epoxy group per molecule and may be obtained by reacting a polyhydroxy alcohol or phenol such as hydroquinone, resorcinol, glycerine, condensation products of phenols with ketones, such as, for example, bis- (4 hydroxyphenol)-2,2-propane with epichlorohydrin.
• phenol such as hydroquinone, resorcinol, glycerine
• ketones such as, for example, bis- (4 hydroxyphenol)-2,2-propane with epichlorohydrin.
• Such epoxy resins are sold under the name of Epon by Shell Chemical Corporation, under the name Araldite by the Ciba Company, as Epi-Rez resin by Devoe-Raynolds, and ERL resins by the Bakelite Company. The data given below for such resins is representative.
• the specimens which were to be examined were then placed into the molds, and the resin-abrasive slurry poured thereover to fill the mold and to completely envelop the specimen. After standing for about 2-3 hours, the resin had cured and the formed mounts were removed from the molds and heated for several minutes at about 200 F. to insure completion of curing. Thereafter, each mounting was ground until a suitable surface of the specimen was revealed which surface was then polished with finishing paper to provide a mirror like finish ready for etching and observation. A slight flaking of the abrasive occurred during the grinding and polishing steps that assists in obtaining a high degree of polish on the specimen surface being prepared.
• the present invention provides a new and distinctly improved means for preparing a specimen mount which aids rather than harms the polishing of the specimen.
• the technique employed eliminates the need for costly mounting presses and saves considerable mounting time.
• no limit is imposed upon the size of the specimens that may be mounted in accordance with the invention.
• the new and improved mounting composition of the present invention provides a particularly strong matrix in which the specimen is to be contained, which matrix is exceptionally heat and solvent resistant.
• the nature of the mounting composition of the present invention is such that it may be used to mount specimens otherwise not mountable, such as, for example, foam metals, graphite, porous materials, and specimens with cracks and voids, by employing a vacuum impregnation technique.
• the method of preparing a specimen mount for observation which comprises the steps of admixing from about 10 to about 30 parts by weight of a powdered abrasive material having a Knoop hardness value of at least 900 with from about 80 to about 120 parts by weight of a curable resin to form a homogeneous mixture, positioning said specimen in a receptacle, adding said mixture to said receptacle to envelop said specimen, curing said resin to provide a solid matrix body containing said specimen, and grinding a surface of said solid matrix body to expose at least a portion of said specimen.
• the method for preparing a specimen mount for observation which comprises the steps of admixing from about 10 to about 30 parts by weight of a powdered abrasive material having a Knoop hardness value of at least 900 with from about 80 to about 120 parts by weight of a curable resin to form a homogeneous mixture, coating the interior surface of a receptacle with a release agent, positioning the specimen to be observed in said receptacle, adding saidmixture to said receptacle to envelop said specimen, curing said resin to provide a solid matrix body containing said specimen, and grinding a surface of said solid matrix body to expose at least a portion of said specimen.
• An improved specimen mount comprising a solid matrix and a specimen, the matrix comprising a mixture of from about 10 to 30 parts by weight of a powdered abrasive material having a Knoop hardness value of at least 900, with from about 80 to about 120 parts by References Cited by the Examiner UNITED STATES PATENTS MORRIS LIEBMAN, Primary Examiner.

Landscapes

• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Immunology (AREA)
• Life Sciences & Earth Sciences (AREA)
• Biochemistry (AREA)
• General Health & Medical Sciences (AREA)
• General Physics & Mathematics (AREA)
• Physics & Mathematics (AREA)
• Pathology (AREA)
• Analytical Chemistry (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Clinical Laboratory Science (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Polishing Bodies And Polishing Tools (AREA)
• Sampling And Sample Adjustment (AREA)

Priority Applications (4)

Applications Claiming Priority (1)

Publications (1)

Family

ID=22461822

Family Applications (1)

Country Status (4)

Cited By (7)

Families Citing this family (1)

Citations (9)

• 1961
  • 1961-08-28 US US134113A patent/US3187444A/en not_active Expired - Lifetime
• 1962
  • 1962-07-24 GB GB28405/62A patent/GB1012454A/en not_active Expired
  • 1962-08-14 DE DE19621478905 patent/DE1478905A1/de active Pending
  • 1962-08-27 CH CH1021962A patent/CH436784A/de unknown

Patent Citations (9)

Also Published As

Similar Documents