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US 8,557,749 B2Granted
Wear-resistant body of sliding material of graphite and synthetic resin binder
AssigneeSgl Carbon SE
InventorsThomas Metzinger, Adi Woizenko
Life of this patent
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Abstract
The invention relates to bodies of sliding material comprising graphite and synthetic resin binder which have improved wear properties and comprise no hygroscopic compounds, such as, for example, phosphates, and in which the graphite filler is composed of a component based on natural graphite and at least one component based on synthetic graphite.
Claims36
A sliding body, comprising:
- a first component of the sliding body based on natural graphite having a proportion of 20 to 40 percent by weight;
- a second component of the sliding body based on synthetic graphite having a proportion of 20 to 50 percent by weight;
- no hygroscopic compounds, including phosphates, being added;
- a synthetic resin binder;
- at least one of:
- said first component containing only said natural graphite and a synthetic resin binder;
- and
- said second component containing only said synthetic graphite and said synthetic resin binder;
- and
- wherein:
- said natural graphite is selected from the group consisting of purified natural graphite, expanded natural graphite and processed graphite foil;
- and
- said synthetic graphite is selected from the group consisting of electrographite, petroleum coke in graphitized form, coal-tar pitch coke in graphitized form and carbon black coke in graphitized form.
10 more elements
A sliding body, comprising:
- a first component of the sliding body based on natural graphite having a proportion of 20 to 40 percent by weight;
- a second component of the sliding body based on synthetic graphite having a proportion of 20 to 50 percent by weight;
- no hygroscopic compounds, including phosphates, being added;
- a synthetic resin binder;
- at least one of:
- said first component containing only said natural graphite and a synthetic resin binder;
- and
- said second component containing only said synthetic graphite and said synthetic resin binder;
- and
- wherein:
- said natural graphite is selected from the group consisting of purified natural graphite, expanded natural graphite and processed graphite foil;
- and
- said synthetic graphite includes two components based on synthetic graphite electrographite and graphitized carbon black coke in a proportion in each case of 15 to 30 percent by weight.
10 more elements
A sliding body, comprising:
- a first component of the sliding body based on natural graphite having a proportion of 20 to 40 percent by weight;
- a second component of the sliding body based on synthetic graphite having a proportion of 20 to 50 percent by weight;
- no hygroscopic compounds, including phosphates, being added;
- a synthetic resin binder;
- several horizontal layers containing, in alternation, either said first component based on said natural graphite or said second component based on said synthetic graphite, and in a case of an uneven number of said horizontal layers, both outer layers formed from said second component based on said synthetic graphite;
- and
- at least one of:
- said first component containing only said natural graphite and a synthetic resin binder;
- and
- said second component containing only said synthetic graphite and said synthetic resin binder.
7 more elements
A sliding body, comprising:
- a first component of the sliding body based on natural graphite having a proportion of 20 to 40 percent by weight;
- a second component of the sliding body based on synthetic graphite having a proportion of 20 to 50 percent by weight;
- no hygroscopic compounds, including phosphates, being added;
- a synthetic resin binder;
- a carbon filler selected from the group consisting of carbon black, mesocarbon microbeads, nanotubes and fullerenes in a proportion of less than 3 percent by weight;
- and
- at least one of:
- said first component containing only said natural graphite and a synthetic resin binder;
- and
- said second component containing only said synthetic graphite and said synthetic resin binder.
7 more elements
A sliding body, comprising:
- a first component of the sliding body based on natural graphite having a proportion of 20 to 40 percent by weight;
- a second component of the sliding body based on synthetic graphite having a proportion of 20 to 50 percent by weight;
- no hygroscopic compounds, including phosphates, being added;
- a synthetic resin binder;
- at least one filler not made of carbon and selected from the group consisting of silicon dioxide, silicon carbide, aluminum oxide, talc and magnesium oxide to an extent of less than 3 per cent by weight;
- and
- at least one of:
- said first component containing only said natural graphite and a synthetic resin binder;
- and
- said second component containing only said synthetic graphite and said synthetic resin binder.
7 more elements
A process for producing a sliding body, which comprises the steps of:
- mixing, a first filler component based on natural graphite having a proportion of 20 to 40 percent by weight and at least one second filler component based on synthetic graphite having a proportion of 20 to 50 percent by weight, in particulate or pulverulent form with at least one synthetic resin binder resulting in a mixture, no hygroscopic compounds, including phosphates, being added;
- processing the mixture into a shaped, sliding body by a compacting process under elevated temperature;
- and
- at least one of:
- said first component containing only said natural graphite and a synthetic resin binder;
- and
- said second component containing only said synthetic graphite and said synthetic resin binder;
- and
- wherein:
- said natural graphite is selected from the group consisting of purified natural graphite, expanded natural graphite and processed graphite foil;
- and
- said synthetic graphite is selected from the group consisting of electrographite, petroleum coke in graphitized form, coal-tar pitch coke in graphitized form and carbon black coke in graphitized form.
9 more elements
A process for producing a layered sliding body, which comprises the steps of:
- mixing a first filler component based on natural graphite having a proportion of 20 to 40 percent by weight in particulate or pulverulent form with at least one binder of synthetic resin until a uniform distribution of components is achieved resulting in a first mixture;
- mixing at least one second filler component based on synthetic graphite having a proportion of 20 to 50 percent by weight in particulate or pulverulent form with more of the at least one binder of synthetic resin until a uniform distribution of components is achieved resulting in a second mixture;
- no hygroscopic compounds, including phosphates, being added;
- processing the first and second mixtures to form a shaped body having an alternating layer sequence of the first mixture and the second mixture using a shaping device under elevated temperature, and in a case of an uneven number of layers, both outer layers being formed of the second filler component based on the synthetic graphite;
- and
- at least one of:
- said first mixture containing only said natural graphite and a synthetic resin binder;
- and
- said second mixture containing only said synthetic graphite and said synthetic resin binder;
- and
- wherein:
- said natural graphite is selected from the group consisting of purified natural graphite, expanded natural graphite and processed graphite foil;
- and
- said synthetic graphite is selected from the group consisting of electrographite, petroleum coke in graphitized form, coal-tar pitch coke in graphitized form and carbon black coke in graphitized form.
11 more elements
Dependencies are inferred from the claim text.