DE1544939C - Process for the production of plain bearing material - Google Patents
Process for the production of plain bearing materialInfo
- Publication number
- DE1544939C DE1544939C DE1544939C DE 1544939 C DE1544939 C DE 1544939C DE 1544939 C DE1544939 C DE 1544939C
- Authority
- DE
- Germany
- Prior art keywords
- plain bearing
- production
- mixture
- bearing material
- oxidizing agent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000000463 material Substances 0.000 title claims description 7
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 238000000034 method Methods 0.000 title claims 2
- 239000000203 mixture Substances 0.000 claims description 6
- 239000007800 oxidant agent Substances 0.000 claims description 6
- -1 polytetrafluoroethylene Polymers 0.000 claims description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 6
- LJCFOYOSGPHIOO-UHFFFAOYSA-N Antimony pentoxide Chemical compound O=[Sb](=O)O[Sb](=O)=O LJCFOYOSGPHIOO-UHFFFAOYSA-N 0.000 claims description 4
- 150000002611 lead compounds Chemical class 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- 229910000906 Bronze Inorganic materials 0.000 claims description 2
- 239000010974 bronze Substances 0.000 claims description 2
- XZTWHWHGBBCSMX-UHFFFAOYSA-J dimagnesium;phosphonato phosphate Chemical compound [Mg+2].[Mg+2].[O-]P([O-])(=O)OP([O-])([O-])=O XZTWHWHGBBCSMX-UHFFFAOYSA-J 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims 1
- JLDSOYXADOWAKB-UHFFFAOYSA-N Aluminium nitrate Chemical compound [Al+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O JLDSOYXADOWAKB-UHFFFAOYSA-N 0.000 description 4
- BFKJFAAPBSQJPD-UHFFFAOYSA-N Tetrafluoroethylene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
Description
Die Erfindung betrifft ein Verfahren zur Herstellung von Gleitlagermaterial, welches Polytetrafluorethylen und eine Bleiverbindung enthält, bei dem man dem Gemisch /vor dem Sintern ein Oxydationsmittel zusetzt.The invention relates to a method for producing plain bearing material, which is polytetrafluoroethylene and contains a lead compound in which an oxidizing agent is added to the mixture / prior to sintering.
Es hat sich gezeigt, daß bei der Herstellung von Gleitlagermaterial aus Polytetrafluoräthylen, das eine Bleiverbindung enthält, während des Sinterns bei einer Temperatur von etwa 380°C oder darunter eine in hohem Maße exotherme Reaktion stattfindet. Bei dem erfindungsgemäßen Verfahren wird das Verdichten solcher Massen in der Weise ermöglicht, daß eine solche Reaktion nicht erfolgt oder im wesentlichen vermieden wird. Offenbar verzögert das Oxydationsmittel die Reaktion, oder es kann ihren Ablauf vollständig verhindern.It has been shown that in the production of plain bearing material from polytetrafluoroethylene, one Lead compound contains an in highly exothermic reaction takes place. In the method according to the invention, the compaction such masses in such a way that such a reaction does not occur or substantially is avoided. Apparently the oxidizing agent delays the reaction, or it can completely delay its course impede.
Aluminiumnitrat ist ein geeignetes Oxydationsmittel, das in der Praxis verwendet wird. : Aluminum nitrate is a suitable oxidizing agent that is used in practice. :
Die Erfindung wird in folgenden Beispielen näher erläutert.The invention is illustrated in more detail in the following examples.
Die Grundmasse enthielt 60 % Polytetrafluoräthylen, 20% Pb3O4 (Bleimennige), 20% Mg2P2O7 (Magnesiumpyrophosphat). Verschiedene Mengen des Oxydationsmittels Al(NO3):, wurden dieser Grundmasse beigefügt und aus dem Pulvergemisch unter einem Preßdruck von etwa 1400kg/cm2 Stäbe hergestellt,, jeder Stab mit einer Bohrung für ein Thermoelement versehen und dann auf einer Unterlage in einen auf. 38O0C eingestellten Luftumwälzofen gebracht. Mit Hilfe des Thermoelements ließ sich eine eventuell stattfindende~exötherme Reaktion feststellen.The base material contained 60% polytetrafluoroethylene, 20% Pb 3 O 4 (red lead), 20% Mg 2 P 2 O 7 (magnesium pyrophosphate). Various amounts of the oxidizing agent Al (NO 3 ): were added to this base material and rods were made from the powder mixture under a pressure of about 1400kg / cm 2 , each rod provided with a hole for a thermocouple and then placed on a base. 38O 0 C set air circulation oven brought. With the help of the thermocouple, a possibly occurring ~ exothermic reaction could be determined.
Bei den Vergleichsstäben ohne Aluminiumnitrat be-., trug die Reaktionszeit zwischen 80 und 90 Minuten.In the case of the comparison bars without aluminum nitrate, the reaction time was between 80 and 90 minutes.
Wenn die Stäbe, bezogen auf das Gewicht des Poly- ' tetrafluoräthylens, zwischen 0,324 und 4,54 Gewichts- ; prozent Aluminiumnitrat enthielten, trat selbst nach 20 Stunden keine Reaktion auf. Diese Stäbe hatten ein gleichmäßig graues Aussehen.If the rods, based on the weight of the poly 'tetrafluoroethylene, between 0.324 and 4.54 weight ; percent aluminum nitrate contained no reaction even after 20 hours. These bars had a uniform gray appearance.
Stäbe mit einem Gehalt an Aluminiumnitrat von über 27,8 % zeigten ebenfalls nach 20 Stunden keine Reaktion, sie hatten kleine graue Flecken, doch war die Bleimenge nur sehr wenig verfärbt.Bars with an aluminum nitrate content of more than 27.8% also showed none after 20 hours Reaction, they had small gray spots, but the amount of lead was only slightly discolored.
B ei sp i e 1 2Example 1 2
■■ Die; Grundmasse enthielt 60 % Polytetrafluoräthy- j len, 37,5 % Pb3O4 und 2,5 % Bronze. '■ ■■ The ; The base material contained 60% polytetrafluoroethylene, 37.5% Pb 3 O 4 and 2.5% bronze. '■
Bezogen auf das Polytetrafluoräthylen, wurden noch 2 Gewichtsprozent Antimonpentoxid (Sb2O5) als Oxy- j dationsmittel beigefügt und bei 38O0C gesintert. :Based on the polytetrafluoroethylene, even 2 weight percent antimony pentoxide (Sb 2 O 5) were added dationsmittel j as oxy- and sintered at 38O 0 C. :
Claims (1)
Family
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